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"""
The `json_schema` module contains classes and functions to allow the way [JSON Schema](https://json-schema.org/)
is generated to be customized.
In general you shouldn't need to use this module directly; instead, you can
[`BaseModel.model_json_schema`][pydantic.BaseModel.model_json_schema] and
[`TypeAdapter.json_schema`][pydantic.TypeAdapter.json_schema].
"""
from __future__ import annotations as _annotations
import dataclasses
import inspect
import math
import re
import warnings
from collections import defaultdict
from copy import deepcopy
from dataclasses import is_dataclass
from enum import Enum
from typing import (
TYPE_CHECKING,
Any,
Callable,
Counter,
Dict,
Hashable,
Iterable,
List,
NewType,
Sequence,
Tuple,
TypeVar,
Union,
cast,
)
import pydantic_core
from pydantic_core import CoreSchema, PydanticOmit, core_schema, to_jsonable_python
from pydantic_core.core_schema import ComputedField
from typing_extensions import Annotated, Literal, assert_never
from ._internal import (
_config,
_core_metadata,
_core_utils,
_decorators,
_internal_dataclass,
_mock_val_ser,
_schema_generation_shared,
_typing_extra,
)
from .annotated_handlers import GetJsonSchemaHandler
from .config import JsonSchemaExtraCallable
from .errors import PydanticInvalidForJsonSchema, PydanticUserError
if TYPE_CHECKING:
from . import ConfigDict
from ._internal._core_utils import CoreSchemaField, CoreSchemaOrField
from ._internal._dataclasses import PydanticDataclass
from ._internal._schema_generation_shared import GetJsonSchemaFunction
from .main import BaseModel
CoreSchemaOrFieldType = Literal[core_schema.CoreSchemaType, core_schema.CoreSchemaFieldType]
"""
A type alias for defined schema types that represents a union of
`core_schema.CoreSchemaType` and
`core_schema.CoreSchemaFieldType`.
"""
JsonSchemaValue = Dict[str, Any]
"""
A type alias for a JSON schema value. This is a dictionary of string keys to arbitrary values.
"""
JsonSchemaMode = Literal['validation', 'serialization']
"""
A type alias that represents the mode of a JSON schema; either 'validation' or 'serialization'.
For some types, the inputs to validation differ from the outputs of serialization. For example,
computed fields will only be present when serializing, and should not be provided when
validating. This flag provides a way to indicate whether you want the JSON schema required
for validation inputs, or that will be matched by serialization outputs.
"""
_MODE_TITLE_MAPPING: dict[JsonSchemaMode, str] = {'validation': 'Input', 'serialization': 'Output'}
def update_json_schema(schema: JsonSchemaValue, updates: dict[str, Any]) -> JsonSchemaValue:
"""Update a JSON schema by providing a dictionary of updates.
This function sets the provided key-value pairs in the schema and returns the updated schema.
Args:
schema: The JSON schema to update.
updates: A dictionary of key-value pairs to set in the schema.
Returns:
The updated JSON schema.
"""
schema.update(updates)
return schema
JsonSchemaWarningKind = Literal['skipped-choice', 'non-serializable-default']
"""
A type alias representing the kinds of warnings that can be emitted during JSON schema generation.
See [`GenerateJsonSchema.render_warning_message`][pydantic.json_schema.GenerateJsonSchema.render_warning_message]
for more details.
"""
class PydanticJsonSchemaWarning(UserWarning):
"""This class is used to emit warnings produced during JSON schema generation.
See the [`GenerateJsonSchema.emit_warning`][pydantic.json_schema.GenerateJsonSchema.emit_warning] and
[`GenerateJsonSchema.render_warning_message`][pydantic.json_schema.GenerateJsonSchema.render_warning_message]
methods for more details; these can be overridden to control warning behavior.
"""
# ##### JSON Schema Generation #####
DEFAULT_REF_TEMPLATE = '#/$defs/{model}'
"""The default format string used to generate reference names."""
# There are three types of references relevant to building JSON schemas:
# 1. core_schema "ref" values; these are not exposed as part of the JSON schema
# * these might look like the fully qualified path of a model, its id, or something similar
CoreRef = NewType('CoreRef', str)
# 2. keys of the "definitions" object that will eventually go into the JSON schema
# * by default, these look like "MyModel", though may change in the presence of collisions
# * eventually, we may want to make it easier to modify the way these names are generated
DefsRef = NewType('DefsRef', str)
# 3. the values corresponding to the "$ref" key in the schema
# * By default, these look like "#/$defs/MyModel", as in {"$ref": "#/$defs/MyModel"}
JsonRef = NewType('JsonRef', str)
CoreModeRef = Tuple[CoreRef, JsonSchemaMode]
JsonSchemaKeyT = TypeVar('JsonSchemaKeyT', bound=Hashable)
@dataclasses.dataclass(**_internal_dataclass.slots_true)
class _DefinitionsRemapping:
defs_remapping: dict[DefsRef, DefsRef]
json_remapping: dict[JsonRef, JsonRef]
@staticmethod
def from_prioritized_choices(
prioritized_choices: dict[DefsRef, list[DefsRef]],
defs_to_json: dict[DefsRef, JsonRef],
definitions: dict[DefsRef, JsonSchemaValue],
) -> _DefinitionsRemapping:
"""
This function should produce a remapping that replaces complex DefsRef with the simpler ones from the
prioritized_choices such that applying the name remapping would result in an equivalent JSON schema.
"""
# We need to iteratively simplify the definitions until we reach a fixed point.
# The reason for this is that outer definitions may reference inner definitions that get simplified
# into an equivalent reference, and the outer definitions won't be equivalent until we've simplified
# the inner definitions.
copied_definitions = deepcopy(definitions)
definitions_schema = {'$defs': copied_definitions}
for _iter in range(100): # prevent an infinite loop in the case of a bug, 100 iterations should be enough
# For every possible remapped DefsRef, collect all schemas that that DefsRef might be used for:
schemas_for_alternatives: dict[DefsRef, list[JsonSchemaValue]] = defaultdict(list)
for defs_ref in copied_definitions:
alternatives = prioritized_choices[defs_ref]
for alternative in alternatives:
schemas_for_alternatives[alternative].append(copied_definitions[defs_ref])
# Deduplicate the schemas for each alternative; the idea is that we only want to remap to a new DefsRef
# if it introduces no ambiguity, i.e., there is only one distinct schema for that DefsRef.
for defs_ref, schemas in schemas_for_alternatives.items():
schemas_for_alternatives[defs_ref] = _deduplicate_schemas(schemas_for_alternatives[defs_ref])
# Build the remapping
defs_remapping: dict[DefsRef, DefsRef] = {}
json_remapping: dict[JsonRef, JsonRef] = {}
for original_defs_ref in definitions:
alternatives = prioritized_choices[original_defs_ref]
# Pick the first alternative that has only one schema, since that means there is no collision
remapped_defs_ref = next(x for x in alternatives if len(schemas_for_alternatives[x]) == 1)
defs_remapping[original_defs_ref] = remapped_defs_ref
json_remapping[defs_to_json[original_defs_ref]] = defs_to_json[remapped_defs_ref]
remapping = _DefinitionsRemapping(defs_remapping, json_remapping)
new_definitions_schema = remapping.remap_json_schema({'$defs': copied_definitions})
if definitions_schema == new_definitions_schema:
# We've reached the fixed point
return remapping
definitions_schema = new_definitions_schema
raise PydanticInvalidForJsonSchema('Failed to simplify the JSON schema definitions')
def remap_defs_ref(self, ref: DefsRef) -> DefsRef:
return self.defs_remapping.get(ref, ref)
def remap_json_ref(self, ref: JsonRef) -> JsonRef:
return self.json_remapping.get(ref, ref)
def remap_json_schema(self, schema: Any) -> Any:
"""
Recursively update the JSON schema replacing all $refs
"""
if isinstance(schema, str):
# Note: this may not really be a JsonRef; we rely on having no collisions between JsonRefs and other strings
return self.remap_json_ref(JsonRef(schema))
elif isinstance(schema, list):
return [self.remap_json_schema(item) for item in schema]
elif isinstance(schema, dict):
for key, value in schema.items():
if key == '$ref' and isinstance(value, str):
schema['$ref'] = self.remap_json_ref(JsonRef(value))
elif key == '$defs':
schema['$defs'] = {
self.remap_defs_ref(DefsRef(key)): self.remap_json_schema(value)
for key, value in schema['$defs'].items()
}
else:
schema[key] = self.remap_json_schema(value)
return schema
class GenerateJsonSchema:
"""A class for generating JSON schemas.
This class generates JSON schemas based on configured parameters. The default schema dialect
is [https://json-schema.org/draft/2020-12/schema](https://json-schema.org/draft/2020-12/schema).
The class uses `by_alias` to configure how fields with
multiple names are handled and `ref_template` to format reference names.
Attributes:
schema_dialect: The JSON schema dialect used to generate the schema. See
[Declaring a Dialect](https://json-schema.org/understanding-json-schema/reference/schema.html#id4)
in the JSON Schema documentation for more information about dialects.
ignored_warning_kinds: Warnings to ignore when generating the schema. `self.render_warning_message` will
do nothing if its argument `kind` is in `ignored_warning_kinds`;
this value can be modified on subclasses to easily control which warnings are emitted.
by_alias: Whether or not to use field names when generating the schema.
ref_template: The format string used when generating reference names.
core_to_json_refs: A mapping of core refs to JSON refs.
core_to_defs_refs: A mapping of core refs to definition refs.
defs_to_core_refs: A mapping of definition refs to core refs.
json_to_defs_refs: A mapping of JSON refs to definition refs.
definitions: Definitions in the schema.
collisions: Definitions with colliding names. When collisions are detected, we choose a non-colliding
name during generation, but we also track the colliding tag so that it can be remapped for the first
occurrence at the end of the process.
defs_ref_fallbacks: Core refs to fallback definitions refs.
_schema_type_to_method: A mapping of schema types to generator methods.
_used: Set to `True` after generating a schema to avoid re-use issues.
mode: The schema mode.
Args:
by_alias: Whether or not to include field names.
ref_template: The format string to use when generating reference names.
Raises:
JsonSchemaError: If the instance of the class is inadvertently re-used after generating a schema.
"""
schema_dialect = 'https://json-schema.org/draft/2020-12/schema'
# `self.render_warning_message` will do nothing if its argument `kind` is in `ignored_warning_kinds`;
# this value can be modified on subclasses to easily control which warnings are emitted
ignored_warning_kinds: set[JsonSchemaWarningKind] = {'skipped-choice'}
def __init__(self, by_alias: bool = True, ref_template: str = DEFAULT_REF_TEMPLATE):
self.by_alias = by_alias
self.ref_template = ref_template
self.core_to_json_refs: dict[CoreModeRef, JsonRef] = {}
self.core_to_defs_refs: dict[CoreModeRef, DefsRef] = {}
self.defs_to_core_refs: dict[DefsRef, CoreModeRef] = {}
self.json_to_defs_refs: dict[JsonRef, DefsRef] = {}
self.definitions: dict[DefsRef, JsonSchemaValue] = {}
self._config_wrapper_stack = _config.ConfigWrapperStack(_config.ConfigWrapper({}))
self._mode: JsonSchemaMode = 'validation'
# The following includes a mapping of a fully-unique defs ref choice to a list of preferred
# alternatives, which are generally simpler, such as only including the class name.
# At the end of schema generation, we use these to produce a JSON schema with more human-readable
# definitions, which would also work better in a generated OpenAPI client, etc.
self._prioritized_defsref_choices: dict[DefsRef, list[DefsRef]] = {}
self._collision_counter: dict[str, int] = defaultdict(int)
self._collision_index: dict[str, int] = {}
self._schema_type_to_method = self.build_schema_type_to_method()
# When we encounter definitions we need to try to build them immediately
# so that they are available schemas that reference them
# But it's possible that CoreSchema was never going to be used
# (e.g. because the CoreSchema that references short circuits is JSON schema generation without needing
# the reference) so instead of failing altogether if we can't build a definition we
# store the error raised and re-throw it if we end up needing that def
self._core_defs_invalid_for_json_schema: dict[DefsRef, PydanticInvalidForJsonSchema] = {}
# This changes to True after generating a schema, to prevent issues caused by accidental re-use
# of a single instance of a schema generator
self._used = False
@property
def _config(self) -> _config.ConfigWrapper:
return self._config_wrapper_stack.tail
@property
def mode(self) -> JsonSchemaMode:
if self._config.json_schema_mode_override is not None:
return self._config.json_schema_mode_override
else:
return self._mode
def build_schema_type_to_method(
self,
) -> dict[CoreSchemaOrFieldType, Callable[[CoreSchemaOrField], JsonSchemaValue]]:
"""Builds a dictionary mapping fields to methods for generating JSON schemas.
Returns:
A dictionary containing the mapping of `CoreSchemaOrFieldType` to a handler method.
Raises:
TypeError: If no method has been defined for generating a JSON schema for a given pydantic core schema type.
"""
mapping: dict[CoreSchemaOrFieldType, Callable[[CoreSchemaOrField], JsonSchemaValue]] = {}
core_schema_types: list[CoreSchemaOrFieldType] = _typing_extra.all_literal_values(
CoreSchemaOrFieldType # type: ignore
)
for key in core_schema_types:
method_name = f"{key.replace('-', '_')}_schema"
try:
mapping[key] = getattr(self, method_name)
except AttributeError as e: # pragma: no cover
raise TypeError(
f'No method for generating JsonSchema for core_schema.type={key!r} '
f'(expected: {type(self).__name__}.{method_name})'
) from e
return mapping
def generate_definitions(
self, inputs: Sequence[tuple[JsonSchemaKeyT, JsonSchemaMode, core_schema.CoreSchema]]
) -> tuple[dict[tuple[JsonSchemaKeyT, JsonSchemaMode], JsonSchemaValue], dict[DefsRef, JsonSchemaValue]]:
"""Generates JSON schema definitions from a list of core schemas, pairing the generated definitions with a
mapping that links the input keys to the definition references.
Args:
inputs: A sequence of tuples, where:
- The first element is a JSON schema key type.
- The second element is the JSON mode: either 'validation' or 'serialization'.
- The third element is a core schema.
Returns:
A tuple where:
- The first element is a dictionary whose keys are tuples of JSON schema key type and JSON mode, and
whose values are the JSON schema corresponding to that pair of inputs. (These schemas may have
JsonRef references to definitions that are defined in the second returned element.)
- The second element is a dictionary whose keys are definition references for the JSON schemas
from the first returned element, and whose values are the actual JSON schema definitions.
Raises:
PydanticUserError: Raised if the JSON schema generator has already been used to generate a JSON schema.
"""
if self._used:
raise PydanticUserError(
'This JSON schema generator has already been used to generate a JSON schema. '
f'You must create a new instance of {type(self).__name__} to generate a new JSON schema.',
code='json-schema-already-used',
)
for key, mode, schema in inputs:
self._mode = mode
self.generate_inner(schema)
definitions_remapping = self._build_definitions_remapping()
json_schemas_map: dict[tuple[JsonSchemaKeyT, JsonSchemaMode], DefsRef] = {}
for key, mode, schema in inputs:
self._mode = mode
json_schema = self.generate_inner(schema)
json_schemas_map[(key, mode)] = definitions_remapping.remap_json_schema(json_schema)
json_schema = {'$defs': self.definitions}
json_schema = definitions_remapping.remap_json_schema(json_schema)
self._used = True
return json_schemas_map, _sort_json_schema(json_schema['$defs']) # type: ignore
def generate(self, schema: CoreSchema, mode: JsonSchemaMode = 'validation') -> JsonSchemaValue:
"""Generates a JSON schema for a specified schema in a specified mode.
Args:
schema: A Pydantic model.
mode: The mode in which to generate the schema. Defaults to 'validation'.
Returns:
A JSON schema representing the specified schema.
Raises:
PydanticUserError: If the JSON schema generator has already been used to generate a JSON schema.
"""
self._mode = mode
if self._used:
raise PydanticUserError(
'This JSON schema generator has already been used to generate a JSON schema. '
f'You must create a new instance of {type(self).__name__} to generate a new JSON schema.',
code='json-schema-already-used',
)
json_schema: JsonSchemaValue = self.generate_inner(schema)
json_ref_counts = self.get_json_ref_counts(json_schema)
# Remove the top-level $ref if present; note that the _generate method already ensures there are no sibling keys
ref = cast(JsonRef, json_schema.get('$ref'))
while ref is not None: # may need to unpack multiple levels
ref_json_schema = self.get_schema_from_definitions(ref)
if json_ref_counts[ref] > 1 or ref_json_schema is None:
# Keep the ref, but use an allOf to remove the top level $ref
json_schema = {'allOf': [{'$ref': ref}]}
else:
# "Unpack" the ref since this is the only reference
json_schema = ref_json_schema.copy() # copy to prevent recursive dict reference
json_ref_counts[ref] -= 1
ref = cast(JsonRef, json_schema.get('$ref'))
self._garbage_collect_definitions(json_schema)
definitions_remapping = self._build_definitions_remapping()
if self.definitions:
json_schema['$defs'] = self.definitions
json_schema = definitions_remapping.remap_json_schema(json_schema)
# For now, we will not set the $schema key. However, if desired, this can be easily added by overriding
# this method and adding the following line after a call to super().generate(schema):
# json_schema['$schema'] = self.schema_dialect
self._used = True
return _sort_json_schema(json_schema)
def generate_inner(self, schema: CoreSchemaOrField) -> JsonSchemaValue: # noqa: C901
"""Generates a JSON schema for a given core schema.
Args:
schema: The given core schema.
Returns:
The generated JSON schema.
"""
# If a schema with the same CoreRef has been handled, just return a reference to it
# Note that this assumes that it will _never_ be the case that the same CoreRef is used
# on types that should have different JSON schemas
if 'ref' in schema:
core_ref = CoreRef(schema['ref']) # type: ignore[typeddict-item]
core_mode_ref = (core_ref, self.mode)
if core_mode_ref in self.core_to_defs_refs and self.core_to_defs_refs[core_mode_ref] in self.definitions:
return {'$ref': self.core_to_json_refs[core_mode_ref]}
# Generate the JSON schema, accounting for the json_schema_override and core_schema_override
metadata_handler = _core_metadata.CoreMetadataHandler(schema)
def populate_defs(core_schema: CoreSchema, json_schema: JsonSchemaValue) -> JsonSchemaValue:
if 'ref' in core_schema:
core_ref = CoreRef(core_schema['ref']) # type: ignore[typeddict-item]
defs_ref, ref_json_schema = self.get_cache_defs_ref_schema(core_ref)
json_ref = JsonRef(ref_json_schema['$ref'])
self.json_to_defs_refs[json_ref] = defs_ref
# Replace the schema if it's not a reference to itself
# What we want to avoid is having the def be just a ref to itself
# which is what would happen if we blindly assigned any
if json_schema.get('$ref', None) != json_ref:
self.definitions[defs_ref] = json_schema
self._core_defs_invalid_for_json_schema.pop(defs_ref, None)
json_schema = ref_json_schema
return json_schema
def convert_to_all_of(json_schema: JsonSchemaValue) -> JsonSchemaValue:
if '$ref' in json_schema and len(json_schema.keys()) > 1:
# technically you can't have any other keys next to a "$ref"
# but it's an easy mistake to make and not hard to correct automatically here
json_schema = json_schema.copy()
ref = json_schema.pop('$ref')
json_schema = {'allOf': [{'$ref': ref}], **json_schema}
return json_schema
def handler_func(schema_or_field: CoreSchemaOrField) -> JsonSchemaValue:
"""Generate a JSON schema based on the input schema.
Args:
schema_or_field: The core schema to generate a JSON schema from.
Returns:
The generated JSON schema.
Raises:
TypeError: If an unexpected schema type is encountered.
"""
# Generate the core-schema-type-specific bits of the schema generation:
json_schema: JsonSchemaValue | None = None
if self.mode == 'serialization' and 'serialization' in schema_or_field:
ser_schema = schema_or_field['serialization'] # type: ignore
json_schema = self.ser_schema(ser_schema)
if json_schema is None:
if _core_utils.is_core_schema(schema_or_field) or _core_utils.is_core_schema_field(schema_or_field):
generate_for_schema_type = self._schema_type_to_method[schema_or_field['type']]
json_schema = generate_for_schema_type(schema_or_field)
else:
raise TypeError(f'Unexpected schema type: schema={schema_or_field}')
if _core_utils.is_core_schema(schema_or_field):
json_schema = populate_defs(schema_or_field, json_schema)
json_schema = convert_to_all_of(json_schema)
return json_schema
current_handler = _schema_generation_shared.GenerateJsonSchemaHandler(self, handler_func)
for js_modify_function in metadata_handler.metadata.get('pydantic_js_functions', ()):
def new_handler_func(
schema_or_field: CoreSchemaOrField,
current_handler: GetJsonSchemaHandler = current_handler,
js_modify_function: GetJsonSchemaFunction = js_modify_function,
) -> JsonSchemaValue:
json_schema = js_modify_function(schema_or_field, current_handler)
if _core_utils.is_core_schema(schema_or_field):
json_schema = populate_defs(schema_or_field, json_schema)
original_schema = current_handler.resolve_ref_schema(json_schema)
ref = json_schema.pop('$ref', None)
if ref and json_schema:
original_schema.update(json_schema)
return original_schema
current_handler = _schema_generation_shared.GenerateJsonSchemaHandler(self, new_handler_func)
for js_modify_function in metadata_handler.metadata.get('pydantic_js_annotation_functions', ()):
def new_handler_func(
schema_or_field: CoreSchemaOrField,
current_handler: GetJsonSchemaHandler = current_handler,
js_modify_function: GetJsonSchemaFunction = js_modify_function,
) -> JsonSchemaValue:
json_schema = js_modify_function(schema_or_field, current_handler)
if _core_utils.is_core_schema(schema_or_field):
json_schema = populate_defs(schema_or_field, json_schema)
json_schema = convert_to_all_of(json_schema)
return json_schema
current_handler = _schema_generation_shared.GenerateJsonSchemaHandler(self, new_handler_func)
json_schema = current_handler(schema)
if _core_utils.is_core_schema(schema):
json_schema = populate_defs(schema, json_schema)
json_schema = convert_to_all_of(json_schema)
return json_schema
# ### Schema generation methods
def any_schema(self, schema: core_schema.AnySchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches any value.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
return {}
def none_schema(self, schema: core_schema.NoneSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a None value.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
return {'type': 'null'}
def bool_schema(self, schema: core_schema.BoolSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a bool value.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
return {'type': 'boolean'}
def int_schema(self, schema: core_schema.IntSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches an Int value.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
json_schema: dict[str, Any] = {'type': 'integer'}
self.update_with_validations(json_schema, schema, self.ValidationsMapping.numeric)
json_schema = {k: v for k, v in json_schema.items() if v not in {math.inf, -math.inf}}
return json_schema
def float_schema(self, schema: core_schema.FloatSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a float value.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
json_schema: dict[str, Any] = {'type': 'number'}
self.update_with_validations(json_schema, schema, self.ValidationsMapping.numeric)
json_schema = {k: v for k, v in json_schema.items() if v not in {math.inf, -math.inf}}
return json_schema
def decimal_schema(self, schema: core_schema.DecimalSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a decimal value.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
json_schema = self.str_schema(core_schema.str_schema())
if self.mode == 'validation':
multiple_of = schema.get('multiple_of')
le = schema.get('le')
ge = schema.get('ge')
lt = schema.get('lt')
gt = schema.get('gt')
json_schema = {
'anyOf': [
self.float_schema(
core_schema.float_schema(
allow_inf_nan=schema.get('allow_inf_nan'),
multiple_of=None if multiple_of is None else float(multiple_of),
le=None if le is None else float(le),
ge=None if ge is None else float(ge),
lt=None if lt is None else float(lt),
gt=None if gt is None else float(gt),
)
),
json_schema,
],
}
return json_schema
def str_schema(self, schema: core_schema.StringSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a string value.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
json_schema = {'type': 'string'}
self.update_with_validations(json_schema, schema, self.ValidationsMapping.string)
return json_schema
def bytes_schema(self, schema: core_schema.BytesSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a bytes value.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
json_schema = {'type': 'string', 'format': 'base64url' if self._config.ser_json_bytes == 'base64' else 'binary'}
self.update_with_validations(json_schema, schema, self.ValidationsMapping.bytes)
return json_schema
def date_schema(self, schema: core_schema.DateSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a date value.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
json_schema = {'type': 'string', 'format': 'date'}
self.update_with_validations(json_schema, schema, self.ValidationsMapping.date)
return json_schema
def time_schema(self, schema: core_schema.TimeSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a time value.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
return {'type': 'string', 'format': 'time'}
def datetime_schema(self, schema: core_schema.DatetimeSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a datetime value.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
return {'type': 'string', 'format': 'date-time'}
def timedelta_schema(self, schema: core_schema.TimedeltaSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a timedelta value.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
if self._config.ser_json_timedelta == 'float':
return {'type': 'number'}
return {'type': 'string', 'format': 'duration'}
def literal_schema(self, schema: core_schema.LiteralSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a literal value.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
expected = [v.value if isinstance(v, Enum) else v for v in schema['expected']]
# jsonify the expected values
expected = [to_jsonable_python(v) for v in expected]
if len(expected) == 1:
return {'const': expected[0]}
types = {type(e) for e in expected}
if types == {str}:
return {'enum': expected, 'type': 'string'}
elif types == {int}:
return {'enum': expected, 'type': 'integer'}
elif types == {float}:
return {'enum': expected, 'type': 'number'}
elif types == {bool}:
return {'enum': expected, 'type': 'boolean'}
elif types == {list}:
return {'enum': expected, 'type': 'array'}
# there is not None case because if it's mixed it hits the final `else`
# if it's a single Literal[None] then it becomes a `const` schema above
else:
return {'enum': expected}
def is_instance_schema(self, schema: core_schema.IsInstanceSchema) -> JsonSchemaValue:
"""Generates a JSON schema that checks if a value is an instance of a class, equivalent to Python's
`isinstance` method.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
return self.handle_invalid_for_json_schema(schema, f'core_schema.IsInstanceSchema ({schema["cls"]})')
def is_subclass_schema(self, schema: core_schema.IsSubclassSchema) -> JsonSchemaValue:
"""Generates a JSON schema that checks if a value is a subclass of a class, equivalent to Python's `issubclass`
method.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
# Note: This is for compatibility with V1; you can override if you want different behavior.
return {}
def callable_schema(self, schema: core_schema.CallableSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a callable value.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
return self.handle_invalid_for_json_schema(schema, 'core_schema.CallableSchema')
def list_schema(self, schema: core_schema.ListSchema) -> JsonSchemaValue:
"""Returns a schema that matches a list schema.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
items_schema = {} if 'items_schema' not in schema else self.generate_inner(schema['items_schema'])
json_schema = {'type': 'array', 'items': items_schema}
self.update_with_validations(json_schema, schema, self.ValidationsMapping.array)
return json_schema
def tuple_positional_schema(self, schema: core_schema.TuplePositionalSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a positional tuple schema e.g. `Tuple[int, str, bool]`.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
json_schema: JsonSchemaValue = {'type': 'array'}
json_schema['minItems'] = len(schema['items_schema'])
prefixItems = [self.generate_inner(item) for item in schema['items_schema']]
if prefixItems:
json_schema['prefixItems'] = prefixItems
if 'extras_schema' in schema:
json_schema['items'] = self.generate_inner(schema['extras_schema'])
else:
json_schema['maxItems'] = len(schema['items_schema'])
self.update_with_validations(json_schema, schema, self.ValidationsMapping.array)
return json_schema
def tuple_variable_schema(self, schema: core_schema.TupleVariableSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a variable tuple schema e.g. `Tuple[int, ...]`.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
items_schema = {} if 'items_schema' not in schema else self.generate_inner(schema['items_schema'])
json_schema = {'type': 'array', 'items': items_schema}
self.update_with_validations(json_schema, schema, self.ValidationsMapping.array)
return json_schema
def set_schema(self, schema: core_schema.SetSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a set schema.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
return self._common_set_schema(schema)
def frozenset_schema(self, schema: core_schema.FrozenSetSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a frozenset schema.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
return self._common_set_schema(schema)
def _common_set_schema(self, schema: core_schema.SetSchema | core_schema.FrozenSetSchema) -> JsonSchemaValue:
items_schema = {} if 'items_schema' not in schema else self.generate_inner(schema['items_schema'])
json_schema = {'type': 'array', 'uniqueItems': True, 'items': items_schema}
self.update_with_validations(json_schema, schema, self.ValidationsMapping.array)
return json_schema
def generator_schema(self, schema: core_schema.GeneratorSchema) -> JsonSchemaValue:
"""Returns a JSON schema that represents the provided GeneratorSchema.
Args:
schema: The schema.
Returns:
The generated JSON schema.
"""
items_schema = {} if 'items_schema' not in schema else self.generate_inner(schema['items_schema'])
json_schema = {'type': 'array', 'items': items_schema}
self.update_with_validations(json_schema, schema, self.ValidationsMapping.array)
return json_schema
def dict_schema(self, schema: core_schema.DictSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a dict schema.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
json_schema: JsonSchemaValue = {'type': 'object'}
keys_schema = self.generate_inner(schema['keys_schema']).copy() if 'keys_schema' in schema else {}
keys_pattern = keys_schema.pop('pattern', None)
values_schema = self.generate_inner(schema['values_schema']).copy() if 'values_schema' in schema else {}
values_schema.pop('title', None) # don't give a title to the additionalProperties
if values_schema or keys_pattern is not None: # don't add additionalProperties if it's empty
if keys_pattern is None:
json_schema['additionalProperties'] = values_schema
else:
json_schema['patternProperties'] = {keys_pattern: values_schema}
self.update_with_validations(json_schema, schema, self.ValidationsMapping.object)
return json_schema
def _function_schema(
self,
schema: _core_utils.AnyFunctionSchema,
) -> JsonSchemaValue:
if _core_utils.is_function_with_inner_schema(schema):
# This could be wrong if the function's mode is 'before', but in practice will often be right, and when it
# isn't, I think it would be hard to automatically infer what the desired schema should be.
return self.generate_inner(schema['schema'])
# function-plain
return self.handle_invalid_for_json_schema(
schema, f'core_schema.PlainValidatorFunctionSchema ({schema["function"]})'
)
def function_before_schema(self, schema: core_schema.BeforeValidatorFunctionSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a function-before schema.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
return self._function_schema(schema)
def function_after_schema(self, schema: core_schema.AfterValidatorFunctionSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a function-after schema.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
return self._function_schema(schema)
def function_plain_schema(self, schema: core_schema.PlainValidatorFunctionSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a function-plain schema.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
return self._function_schema(schema)
def function_wrap_schema(self, schema: core_schema.WrapValidatorFunctionSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a function-wrap schema.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
return self._function_schema(schema)
def default_schema(self, schema: core_schema.WithDefaultSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a schema with a default value.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
json_schema = self.generate_inner(schema['schema'])
if 'default' not in schema:
return json_schema
default = schema['default']
# Note: if you want to include the value returned by the default_factory,
# override this method and replace the code above with:
# if 'default' in schema:
# default = schema['default']
# elif 'default_factory' in schema:
# default = schema['default_factory']()
# else:
# return json_schema
try:
encoded_default = self.encode_default(default)
except pydantic_core.PydanticSerializationError:
self.emit_warning(
'non-serializable-default',
f'Default value {default} is not JSON serializable; excluding default from JSON schema',
)
# Return the inner schema, as though there was no default
return json_schema
if '$ref' in json_schema:
# Since reference schemas do not support child keys, we wrap the reference schema in a single-case allOf:
return {'allOf': [json_schema], 'default': encoded_default}
else:
json_schema['default'] = encoded_default
return json_schema
def nullable_schema(self, schema: core_schema.NullableSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a schema that allows null values.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
null_schema = {'type': 'null'}
inner_json_schema = self.generate_inner(schema['schema'])
if inner_json_schema == null_schema:
return null_schema
else:
# Thanks to the equality check against `null_schema` above, I think 'oneOf' would also be valid here;
# I'll use 'anyOf' for now, but it could be changed it if it would work better with some external tooling
return self.get_flattened_anyof([inner_json_schema, null_schema])
def union_schema(self, schema: core_schema.UnionSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a schema that allows values matching any of the given schemas.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
generated: list[JsonSchemaValue] = []
choices = schema['choices']
for choice in choices:
# choice will be a tuple if an explicit label was provided
choice_schema = choice[0] if isinstance(choice, tuple) else choice
try:
generated.append(self.generate_inner(choice_schema))
except PydanticOmit:
continue
except PydanticInvalidForJsonSchema as exc:
self.emit_warning('skipped-choice', exc.message)
if len(generated) == 1:
return generated[0]
return self.get_flattened_anyof(generated)
def tagged_union_schema(self, schema: core_schema.TaggedUnionSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a schema that allows values matching any of the given schemas, where
the schemas are tagged with a discriminator field that indicates which schema should be used to validate
the value.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
generated: dict[str, JsonSchemaValue] = {}
for k, v in schema['choices'].items():
if isinstance(k, Enum):
k = k.value
try:
# Use str(k) since keys must be strings for json; while not technically correct,
# it's the closest that can be represented in valid JSON
generated[str(k)] = self.generate_inner(v).copy()
except PydanticOmit:
continue
except PydanticInvalidForJsonSchema as exc:
self.emit_warning('skipped-choice', exc.message)
one_of_choices = _deduplicate_schemas(generated.values())
json_schema: JsonSchemaValue = {'oneOf': one_of_choices}
# This reflects the v1 behavior; TODO: we should make it possible to exclude OpenAPI stuff from the JSON schema
openapi_discriminator = self._extract_discriminator(schema, one_of_choices)
if openapi_discriminator is not None:
json_schema['discriminator'] = {
'propertyName': openapi_discriminator,
'mapping': {k: v.get('$ref', v) for k, v in generated.items()},
}
return json_schema
def _extract_discriminator(
self, schema: core_schema.TaggedUnionSchema, one_of_choices: list[_JsonDict]
) -> str | None:
"""Extract a compatible OpenAPI discriminator from the schema and one_of choices that end up in the final
schema."""
openapi_discriminator: str | None = None
if isinstance(schema['discriminator'], str):
return schema['discriminator']
if isinstance(schema['discriminator'], list):
# If the discriminator is a single item list containing a string, that is equivalent to the string case
if len(schema['discriminator']) == 1 and isinstance(schema['discriminator'][0], str):
return schema['discriminator'][0]
# When an alias is used that is different from the field name, the discriminator will be a list of single
# str lists, one for the attribute and one for the actual alias. The logic here will work even if there is
# more than one possible attribute, and looks for whether a single alias choice is present as a documented
# property on all choices. If so, that property will be used as the OpenAPI discriminator.
for alias_path in schema['discriminator']:
if not isinstance(alias_path, list):
break # this means that the discriminator is not a list of alias paths
if len(alias_path) != 1:
continue # this means that the "alias" does not represent a single field
alias = alias_path[0]
if not isinstance(alias, str):
continue # this means that the "alias" does not represent a field
alias_is_present_on_all_choices = True
for choice in one_of_choices:
while '$ref' in choice:
assert isinstance(choice['$ref'], str)
choice = self.get_schema_from_definitions(JsonRef(choice['$ref'])) or {}
properties = choice.get('properties', {})
if not isinstance(properties, dict) or alias not in properties:
alias_is_present_on_all_choices = False
break
if alias_is_present_on_all_choices:
openapi_discriminator = alias
break
return openapi_discriminator
def chain_schema(self, schema: core_schema.ChainSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a core_schema.ChainSchema.
When generating a schema for validation, we return the validation JSON schema for the first step in the chain.
For serialization, we return the serialization JSON schema for the last step in the chain.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
step_index = 0 if self.mode == 'validation' else -1 # use first step for validation, last for serialization
return self.generate_inner(schema['steps'][step_index])
def lax_or_strict_schema(self, schema: core_schema.LaxOrStrictSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a schema that allows values matching either the lax schema or the
strict schema.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
# TODO: Need to read the default value off of model config or whatever
use_strict = schema.get('strict', False) # TODO: replace this default False
# If your JSON schema fails to generate it is probably
# because one of the following two branches failed.
if use_strict:
return self.generate_inner(schema['strict_schema'])
else:
return self.generate_inner(schema['lax_schema'])
def json_or_python_schema(self, schema: core_schema.JsonOrPythonSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a schema that allows values matching either the JSON schema or the
Python schema.
The JSON schema is used instead of the Python schema. If you want to use the Python schema, you should override
this method.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
return self.generate_inner(schema['json_schema'])
def typed_dict_schema(self, schema: core_schema.TypedDictSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a schema that defines a typed dict.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
total = schema.get('total', True)
named_required_fields: list[tuple[str, bool, CoreSchemaField]] = [
(name, self.field_is_required(field, total), field)
for name, field in schema['fields'].items()
if self.field_is_present(field)
]
if self.mode == 'serialization':
named_required_fields.extend(self._name_required_computed_fields(schema.get('computed_fields', [])))
config = _get_typed_dict_config(schema)
with self._config_wrapper_stack.push(config):
json_schema = self._named_required_fields_schema(named_required_fields)
extra = config.get('extra', 'ignore')
if extra == 'forbid':
json_schema['additionalProperties'] = False
elif extra == 'allow':
json_schema['additionalProperties'] = True
return json_schema
@staticmethod
def _name_required_computed_fields(
computed_fields: list[ComputedField],
) -> list[tuple[str, bool, core_schema.ComputedField]]:
return [(field['property_name'], True, field) for field in computed_fields]
def _named_required_fields_schema(
self, named_required_fields: Sequence[tuple[str, bool, CoreSchemaField]]
) -> JsonSchemaValue:
properties: dict[str, JsonSchemaValue] = {}
required_fields: list[str] = []
for name, required, field in named_required_fields:
if self.by_alias:
name = self._get_alias_name(field, name)
try:
field_json_schema = self.generate_inner(field).copy()
except PydanticOmit:
continue
if 'title' not in field_json_schema and self.field_title_should_be_set(field):
title = self.get_title_from_name(name)
field_json_schema['title'] = title
field_json_schema = self.handle_ref_overrides(field_json_schema)
properties[name] = field_json_schema
if required:
required_fields.append(name)
json_schema = {'type': 'object', 'properties': properties}
if required_fields:
json_schema['required'] = required_fields
return json_schema
def _get_alias_name(self, field: CoreSchemaField, name: str) -> str:
if field['type'] == 'computed-field':
alias: Any = field.get('alias', name)
elif self.mode == 'validation':
alias = field.get('validation_alias', name)
else:
alias = field.get('serialization_alias', name)
if isinstance(alias, str):
name = alias
elif isinstance(alias, list):
alias = cast('list[str] | str', alias)
for path in alias:
if isinstance(path, list) and len(path) == 1 and isinstance(path[0], str):
# Use the first valid single-item string path; the code that constructs the alias array
# should ensure the first such item is what belongs in the JSON schema
name = path[0]
break
else:
assert_never(alias)
return name
def typed_dict_field_schema(self, schema: core_schema.TypedDictField) -> JsonSchemaValue:
"""Generates a JSON schema that matches a schema that defines a typed dict field.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
return self.generate_inner(schema['schema'])
def dataclass_field_schema(self, schema: core_schema.DataclassField) -> JsonSchemaValue:
"""Generates a JSON schema that matches a schema that defines a dataclass field.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
return self.generate_inner(schema['schema'])
def model_field_schema(self, schema: core_schema.ModelField) -> JsonSchemaValue:
"""Generates a JSON schema that matches a schema that defines a model field.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
return self.generate_inner(schema['schema'])
def computed_field_schema(self, schema: core_schema.ComputedField) -> JsonSchemaValue:
"""Generates a JSON schema that matches a schema that defines a computed field.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
return self.generate_inner(schema['return_schema'])
def model_schema(self, schema: core_schema.ModelSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a schema that defines a model.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
# We do not use schema['model'].model_json_schema() here
# because it could lead to inconsistent refs handling, etc.
cls = cast('type[BaseModel]', schema['cls'])
config = cls.model_config
title = config.get('title')
with self._config_wrapper_stack.push(config):
json_schema = self.generate_inner(schema['schema'])
json_schema_extra = config.get('json_schema_extra')
if cls.__pydantic_root_model__:
root_json_schema_extra = cls.model_fields['root'].json_schema_extra
if json_schema_extra and root_json_schema_extra:
raise ValueError(
'"model_config[\'json_schema_extra\']" and "Field.json_schema_extra" on "RootModel.root"'
' field must not be set simultaneously'
)
if root_json_schema_extra:
json_schema_extra = root_json_schema_extra
json_schema = self._update_class_schema(json_schema, title, config.get('extra', None), cls, json_schema_extra)
return json_schema
def _update_class_schema(
self,
json_schema: JsonSchemaValue,
title: str | None,
extra: Literal['allow', 'ignore', 'forbid'] | None,
cls: type[Any],
json_schema_extra: dict[str, Any] | JsonSchemaExtraCallable | None,
) -> JsonSchemaValue:
if '$ref' in json_schema:
schema_to_update = self.get_schema_from_definitions(JsonRef(json_schema['$ref'])) or json_schema
else:
schema_to_update = json_schema
if title is not None:
# referenced_schema['title'] = title
schema_to_update.setdefault('title', title)
if 'additionalProperties' not in schema_to_update:
if extra == 'allow':
schema_to_update['additionalProperties'] = True
elif extra == 'forbid':
schema_to_update['additionalProperties'] = False
if isinstance(json_schema_extra, (staticmethod, classmethod)):
# In older versions of python, this is necessary to ensure staticmethod/classmethods are callable
json_schema_extra = json_schema_extra.__get__(cls)
if isinstance(json_schema_extra, dict):
schema_to_update.update(json_schema_extra)
elif callable(json_schema_extra):
if len(inspect.signature(json_schema_extra).parameters) > 1:
json_schema_extra(schema_to_update, cls) # type: ignore
else:
json_schema_extra(schema_to_update) # type: ignore
elif json_schema_extra is not None:
raise ValueError(
f"model_config['json_schema_extra']={json_schema_extra} should be a dict, callable, or None"
)
return json_schema
def resolve_schema_to_update(self, json_schema: JsonSchemaValue) -> JsonSchemaValue:
"""Resolve a JsonSchemaValue to the non-ref schema if it is a $ref schema.
Args:
json_schema: The schema to resolve.
Returns:
The resolved schema.
"""
if '$ref' in json_schema:
schema_to_update = self.get_schema_from_definitions(JsonRef(json_schema['$ref']))
if schema_to_update is None:
raise RuntimeError(f'Cannot update undefined schema for $ref={json_schema["$ref"]}')
return self.resolve_schema_to_update(schema_to_update)
else:
schema_to_update = json_schema
return schema_to_update
def model_fields_schema(self, schema: core_schema.ModelFieldsSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a schema that defines a model's fields.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
named_required_fields: list[tuple[str, bool, CoreSchemaField]] = [
(name, self.field_is_required(field, total=True), field)
for name, field in schema['fields'].items()
if self.field_is_present(field)
]
if self.mode == 'serialization':
named_required_fields.extend(self._name_required_computed_fields(schema.get('computed_fields', [])))
json_schema = self._named_required_fields_schema(named_required_fields)
extras_schema = schema.get('extras_schema', None)
if extras_schema is not None:
schema_to_update = self.resolve_schema_to_update(json_schema)
schema_to_update['additionalProperties'] = self.generate_inner(extras_schema)
return json_schema
def field_is_present(self, field: CoreSchemaField) -> bool:
"""Whether the field should be included in the generated JSON schema.
Args:
field: The schema for the field itself.
Returns:
`True` if the field should be included in the generated JSON schema, `False` otherwise.
"""
if self.mode == 'serialization':
# If you still want to include the field in the generated JSON schema,
# override this method and return True
return not field.get('serialization_exclude')
elif self.mode == 'validation':
return True
else:
assert_never(self.mode)
def field_is_required(
self,
field: core_schema.ModelField | core_schema.DataclassField | core_schema.TypedDictField,
total: bool,
) -> bool:
"""Whether the field should be marked as required in the generated JSON schema.
(Note that this is irrelevant if the field is not present in the JSON schema.).
Args:
field: The schema for the field itself.
total: Only applies to `TypedDictField`s.
Indicates if the `TypedDict` this field belongs to is total, in which case any fields that don't
explicitly specify `required=False` are required.
Returns:
`True` if the field should be marked as required in the generated JSON schema, `False` otherwise.
"""
if self.mode == 'serialization' and self._config.json_schema_serialization_defaults_required:
return not field.get('serialization_exclude')
else:
if field['type'] == 'typed-dict-field':
return field.get('required', total)
else:
return field['schema']['type'] != 'default'
def dataclass_args_schema(self, schema: core_schema.DataclassArgsSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a schema that defines a dataclass's constructor arguments.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
named_required_fields: list[tuple[str, bool, CoreSchemaField]] = [
(field['name'], self.field_is_required(field, total=True), field)
for field in schema['fields']
if self.field_is_present(field)
]
if self.mode == 'serialization':
named_required_fields.extend(self._name_required_computed_fields(schema.get('computed_fields', [])))
return self._named_required_fields_schema(named_required_fields)
def dataclass_schema(self, schema: core_schema.DataclassSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a schema that defines a dataclass.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
cls = schema['cls']
config: ConfigDict = getattr(cls, '__pydantic_config__', cast('ConfigDict', {}))
title = config.get('title') or cls.__name__
with self._config_wrapper_stack.push(config):
json_schema = self.generate_inner(schema['schema']).copy()
json_schema_extra = config.get('json_schema_extra')
json_schema = self._update_class_schema(json_schema, title, config.get('extra', None), cls, json_schema_extra)
# Dataclass-specific handling of description
if is_dataclass(cls) and not hasattr(cls, '__pydantic_validator__'):
# vanilla dataclass; don't use cls.__doc__ as it will contain the class signature by default
description = None
else:
description = None if cls.__doc__ is None else inspect.cleandoc(cls.__doc__)
if description:
json_schema['description'] = description
return json_schema
def arguments_schema(self, schema: core_schema.ArgumentsSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a schema that defines a function's arguments.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
metadata = _core_metadata.CoreMetadataHandler(schema).metadata
prefer_positional = metadata.get('pydantic_js_prefer_positional_arguments')
arguments = schema['arguments_schema']
kw_only_arguments = [a for a in arguments if a.get('mode') == 'keyword_only']
kw_or_p_arguments = [a for a in arguments if a.get('mode') in {'positional_or_keyword', None}]
p_only_arguments = [a for a in arguments if a.get('mode') == 'positional_only']
var_args_schema = schema.get('var_args_schema')
var_kwargs_schema = schema.get('var_kwargs_schema')
if prefer_positional:
positional_possible = not kw_only_arguments and not var_kwargs_schema
if positional_possible:
return self.p_arguments_schema(p_only_arguments + kw_or_p_arguments, var_args_schema)
keyword_possible = not p_only_arguments and not var_args_schema
if keyword_possible:
return self.kw_arguments_schema(kw_or_p_arguments + kw_only_arguments, var_kwargs_schema)
if not prefer_positional:
positional_possible = not kw_only_arguments and not var_kwargs_schema
if positional_possible:
return self.p_arguments_schema(p_only_arguments + kw_or_p_arguments, var_args_schema)
# TODO: When support for Python 3.7 is dropped, uncomment the block on `test_json_schema`
# to cover this test case.
raise PydanticInvalidForJsonSchema( # pragma: no cover
'Unable to generate JSON schema for arguments validator with positional-only and keyword-only arguments'
)
def kw_arguments_schema(
self, arguments: list[core_schema.ArgumentsParameter], var_kwargs_schema: CoreSchema | None
) -> JsonSchemaValue:
"""Generates a JSON schema that matches a schema that defines a function's keyword arguments.
Args:
arguments: The core schema.
Returns:
The generated JSON schema.
"""
properties: dict[str, JsonSchemaValue] = {}
required: list[str] = []
for argument in arguments:
name = self.get_argument_name(argument)
argument_schema = self.generate_inner(argument['schema']).copy()
argument_schema['title'] = self.get_title_from_name(name)
properties[name] = argument_schema
if argument['schema']['type'] != 'default':
# This assumes that if the argument has a default value,
# the inner schema must be of type WithDefaultSchema.
# I believe this is true, but I am not 100% sure
required.append(name)
json_schema: JsonSchemaValue = {'type': 'object', 'properties': properties}
if required:
json_schema['required'] = required
if var_kwargs_schema:
additional_properties_schema = self.generate_inner(var_kwargs_schema)
if additional_properties_schema:
json_schema['additionalProperties'] = additional_properties_schema
else:
json_schema['additionalProperties'] = False
return json_schema
def p_arguments_schema(
self, arguments: list[core_schema.ArgumentsParameter], var_args_schema: CoreSchema | None
) -> JsonSchemaValue:
"""Generates a JSON schema that matches a schema that defines a function's positional arguments.
Args:
arguments: The core schema.
Returns:
The generated JSON schema.
"""
prefix_items: list[JsonSchemaValue] = []
min_items = 0
for argument in arguments:
name = self.get_argument_name(argument)
argument_schema = self.generate_inner(argument['schema']).copy()
argument_schema['title'] = self.get_title_from_name(name)
prefix_items.append(argument_schema)
if argument['schema']['type'] != 'default':
# This assumes that if the argument has a default value,
# the inner schema must be of type WithDefaultSchema.
# I believe this is true, but I am not 100% sure
min_items += 1
json_schema: JsonSchemaValue = {'type': 'array', 'prefixItems': prefix_items}
if min_items:
json_schema['minItems'] = min_items
if var_args_schema:
items_schema = self.generate_inner(var_args_schema)
if items_schema:
json_schema['items'] = items_schema
else:
json_schema['maxItems'] = len(prefix_items)
return json_schema
def get_argument_name(self, argument: core_schema.ArgumentsParameter) -> str:
"""Retrieves the name of an argument.
Args:
argument: The core schema.
Returns:
The name of the argument.
"""
name = argument['name']
if self.by_alias:
alias = argument.get('alias')
if isinstance(alias, str):
name = alias
else:
pass # might want to do something else?
return name
def call_schema(self, schema: core_schema.CallSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a schema that defines a function call.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
return self.generate_inner(schema['arguments_schema'])
def custom_error_schema(self, schema: core_schema.CustomErrorSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a schema that defines a custom error.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
return self.generate_inner(schema['schema'])
def json_schema(self, schema: core_schema.JsonSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a schema that defines a JSON object.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
content_core_schema = schema.get('schema') or core_schema.any_schema()
content_json_schema = self.generate_inner(content_core_schema)
if self.mode == 'validation':
return {'type': 'string', 'contentMediaType': 'application/json', 'contentSchema': content_json_schema}
else:
# self.mode == 'serialization'
return content_json_schema
def url_schema(self, schema: core_schema.UrlSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a schema that defines a URL.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
json_schema = {'type': 'string', 'format': 'uri', 'minLength': 1}
self.update_with_validations(json_schema, schema, self.ValidationsMapping.string)
return json_schema
def multi_host_url_schema(self, schema: core_schema.MultiHostUrlSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a schema that defines a URL that can be used with multiple hosts.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
# Note: 'multi-host-uri' is a custom/pydantic-specific format, not part of the JSON Schema spec
json_schema = {'type': 'string', 'format': 'multi-host-uri', 'minLength': 1}
self.update_with_validations(json_schema, schema, self.ValidationsMapping.string)
return json_schema
def uuid_schema(self, schema: core_schema.UuidSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a UUID.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
return {'type': 'string', 'format': 'uuid'}
def definitions_schema(self, schema: core_schema.DefinitionsSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a schema that defines a JSON object with definitions.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
for definition in schema['definitions']:
try:
self.generate_inner(definition)
except PydanticInvalidForJsonSchema as e:
core_ref: CoreRef = CoreRef(definition['ref']) # type: ignore
self._core_defs_invalid_for_json_schema[self.get_defs_ref((core_ref, self.mode))] = e
continue
return self.generate_inner(schema['schema'])
def definition_ref_schema(self, schema: core_schema.DefinitionReferenceSchema) -> JsonSchemaValue:
"""Generates a JSON schema that matches a schema that references a definition.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
core_ref = CoreRef(schema['schema_ref'])
_, ref_json_schema = self.get_cache_defs_ref_schema(core_ref)
return ref_json_schema
def ser_schema(
self, schema: core_schema.SerSchema | core_schema.IncExSeqSerSchema | core_schema.IncExDictSerSchema
) -> JsonSchemaValue | None:
"""Generates a JSON schema that matches a schema that defines a serialized object.
Args:
schema: The core schema.
Returns:
The generated JSON schema.
"""
schema_type = schema['type']
if schema_type == 'function-plain' or schema_type == 'function-wrap':
# PlainSerializerFunctionSerSchema or WrapSerializerFunctionSerSchema
return_schema = schema.get('return_schema')
if return_schema is not None:
return self.generate_inner(return_schema)
elif schema_type == 'format' or schema_type == 'to-string':
# FormatSerSchema or ToStringSerSchema
return self.str_schema(core_schema.str_schema())
elif schema['type'] == 'model':
# ModelSerSchema
return self.generate_inner(schema['schema'])
return None
# ### Utility methods
def get_title_from_name(self, name: str) -> str:
"""Retrieves a title from a name.
Args:
name: The name to retrieve a title from.
Returns:
The title.
"""
return name.title().replace('_', ' ')
def field_title_should_be_set(self, schema: CoreSchemaOrField) -> bool:
"""Returns true if a field with the given schema should have a title set based on the field name.
Intuitively, we want this to return true for schemas that wouldn't otherwise provide their own title
(e.g., int, float, str), and false for those that would (e.g., BaseModel subclasses).
Args:
schema: The schema to check.
Returns:
`True` if the field should have a title set, `False` otherwise.
"""
if _core_utils.is_core_schema_field(schema):
if schema['type'] == 'computed-field':
field_schema = schema['return_schema']
else:
field_schema = schema['schema']
return self.field_title_should_be_set(field_schema)
elif _core_utils.is_core_schema(schema):
if schema.get('ref'): # things with refs, such as models and enums, should not have titles set
return False
if schema['type'] in {'default', 'nullable', 'definitions'}:
return self.field_title_should_be_set(schema['schema']) # type: ignore[typeddict-item]
if _core_utils.is_function_with_inner_schema(schema):
return self.field_title_should_be_set(schema['schema'])
if schema['type'] == 'definition-ref':
# Referenced schemas should not have titles set for the same reason
# schemas with refs should not
return False
return True # anything else should have title set
else:
raise PydanticInvalidForJsonSchema(f'Unexpected schema type: schema={schema}') # pragma: no cover
def normalize_name(self, name: str) -> str:
"""Normalizes a name to be used as a key in a dictionary.
Args:
name: The name to normalize.
Returns:
The normalized name.
"""
return re.sub(r'[^a-zA-Z0-9.\-_]', '_', name).replace('.', '__')
def get_defs_ref(self, core_mode_ref: CoreModeRef) -> DefsRef:
"""Override this method to change the way that definitions keys are generated from a core reference.
Args:
core_mode_ref: The core reference.
Returns:
The definitions key.
"""
# Split the core ref into "components"; generic origins and arguments are each separate components
core_ref, mode = core_mode_ref
components = re.split(r'([\][,])', core_ref)
# Remove IDs from each component
components = [x.split(':')[0] for x in components]
core_ref_no_id = ''.join(components)
# Remove everything before the last period from each "component"
components = [re.sub(r'(?:[^.[\]]+\.)+((?:[^.[\]]+))', r'\1', x) for x in components]
short_ref = ''.join(components)
mode_title = _MODE_TITLE_MAPPING[mode]
# It is important that the generated defs_ref values be such that at least one choice will not
# be generated for any other core_ref. Currently, this should be the case because we include
# the id of the source type in the core_ref
name = DefsRef(self.normalize_name(short_ref))
name_mode = DefsRef(self.normalize_name(short_ref) + f'-{mode_title}')
module_qualname = DefsRef(self.normalize_name(core_ref_no_id))
module_qualname_mode = DefsRef(f'{module_qualname}-{mode_title}')
module_qualname_id = DefsRef(self.normalize_name(core_ref))
occurrence_index = self._collision_index.get(module_qualname_id)
if occurrence_index is None:
self._collision_counter[module_qualname] += 1
occurrence_index = self._collision_index[module_qualname_id] = self._collision_counter[module_qualname]
module_qualname_occurrence = DefsRef(f'{module_qualname}__{occurrence_index}')
module_qualname_occurrence_mode = DefsRef(f'{module_qualname_mode}__{occurrence_index}')
self._prioritized_defsref_choices[module_qualname_occurrence_mode] = [
name,
name_mode,
module_qualname,
module_qualname_mode,
module_qualname_occurrence,
module_qualname_occurrence_mode,
]
return module_qualname_occurrence_mode
def get_cache_defs_ref_schema(self, core_ref: CoreRef) -> tuple[DefsRef, JsonSchemaValue]:
"""This method wraps the get_defs_ref method with some cache-lookup/population logic,
and returns both the produced defs_ref and the JSON schema that will refer to the right definition.
Args:
core_ref: The core reference to get the definitions reference for.
Returns:
A tuple of the definitions reference and the JSON schema that will refer to it.
"""
core_mode_ref = (core_ref, self.mode)
maybe_defs_ref = self.core_to_defs_refs.get(core_mode_ref)
if maybe_defs_ref is not None:
json_ref = self.core_to_json_refs[core_mode_ref]
return maybe_defs_ref, {'$ref': json_ref}
defs_ref = self.get_defs_ref(core_mode_ref)
# populate the ref translation mappings
self.core_to_defs_refs[core_mode_ref] = defs_ref
self.defs_to_core_refs[defs_ref] = core_mode_ref
json_ref = JsonRef(self.ref_template.format(model=defs_ref))
self.core_to_json_refs[core_mode_ref] = json_ref
self.json_to_defs_refs[json_ref] = defs_ref
ref_json_schema = {'$ref': json_ref}
return defs_ref, ref_json_schema
def handle_ref_overrides(self, json_schema: JsonSchemaValue) -> JsonSchemaValue:
"""It is not valid for a schema with a top-level $ref to have sibling keys.
During our own schema generation, we treat sibling keys as overrides to the referenced schema,
but this is not how the official JSON schema spec works.
Because of this, we first remove any sibling keys that are redundant with the referenced schema, then if
any remain, we transform the schema from a top-level '$ref' to use allOf to move the $ref out of the top level.
(See bottom of https://swagger.io/docs/specification/using-ref/ for a reference about this behavior)
"""
if '$ref' in json_schema:
# prevent modifications to the input; this copy may be safe to drop if there is significant overhead
json_schema = json_schema.copy()
referenced_json_schema = self.get_schema_from_definitions(JsonRef(json_schema['$ref']))
if referenced_json_schema is None:
# This can happen when building schemas for models with not-yet-defined references.
# It may be a good idea to do a recursive pass at the end of the generation to remove
# any redundant override keys.
if len(json_schema) > 1:
# Make it an allOf to at least resolve the sibling keys issue
json_schema = json_schema.copy()
json_schema.setdefault('allOf', [])
json_schema['allOf'].append({'$ref': json_schema['$ref']})
del json_schema['$ref']
return json_schema
for k, v in list(json_schema.items()):
if k == '$ref':
continue
if k in referenced_json_schema and referenced_json_schema[k] == v:
del json_schema[k] # redundant key
if len(json_schema) > 1:
# There is a remaining "override" key, so we need to move $ref out of the top level
json_ref = JsonRef(json_schema['$ref'])
del json_schema['$ref']
assert 'allOf' not in json_schema # this should never happen, but just in case
json_schema['allOf'] = [{'$ref': json_ref}]
return json_schema
def get_schema_from_definitions(self, json_ref: JsonRef) -> JsonSchemaValue | None:
def_ref = self.json_to_defs_refs[json_ref]
if def_ref in self._core_defs_invalid_for_json_schema:
raise self._core_defs_invalid_for_json_schema[def_ref]
return self.definitions.get(def_ref, None)
def encode_default(self, dft: Any) -> Any:
"""Encode a default value to a JSON-serializable value.
This is used to encode default values for fields in the generated JSON schema.
Args:
dft: The default value to encode.
Returns:
The encoded default value.
"""
config = self._config
return pydantic_core.to_jsonable_python(
dft,
timedelta_mode=config.ser_json_timedelta,
bytes_mode=config.ser_json_bytes,
)
def update_with_validations(
self, json_schema: JsonSchemaValue, core_schema: CoreSchema, mapping: dict[str, str]
) -> None:
"""Update the json_schema with the corresponding validations specified in the core_schema,
using the provided mapping to translate keys in core_schema to the appropriate keys for a JSON schema.
Args:
json_schema: The JSON schema to update.
core_schema: The core schema to get the validations from.
mapping: A mapping from core_schema attribute names to the corresponding JSON schema attribute names.
"""
for core_key, json_schema_key in mapping.items():
if core_key in core_schema:
json_schema[json_schema_key] = core_schema[core_key]
class ValidationsMapping:
"""This class just contains mappings from core_schema attribute names to the corresponding
JSON schema attribute names. While I suspect it is unlikely to be necessary, you can in
principle override this class in a subclass of GenerateJsonSchema (by inheriting from
GenerateJsonSchema.ValidationsMapping) to change these mappings.
"""
numeric = {
'multiple_of': 'multipleOf',
'le': 'maximum',
'ge': 'minimum',
'lt': 'exclusiveMaximum',
'gt': 'exclusiveMinimum',
}
bytes = {
'min_length': 'minLength',
'max_length': 'maxLength',
}
string = {
'min_length': 'minLength',
'max_length': 'maxLength',
'pattern': 'pattern',
}
array = {
'min_length': 'minItems',
'max_length': 'maxItems',
}
object = {
'min_length': 'minProperties',
'max_length': 'maxProperties',
}
date = {
'le': 'maximum',
'ge': 'minimum',
'lt': 'exclusiveMaximum',
'gt': 'exclusiveMinimum',
}
def get_flattened_anyof(self, schemas: list[JsonSchemaValue]) -> JsonSchemaValue:
members = []
for schema in schemas:
if len(schema) == 1 and 'anyOf' in schema:
members.extend(schema['anyOf'])
else:
members.append(schema)
members = _deduplicate_schemas(members)
if len(members) == 1:
return members[0]
return {'anyOf': members}
def get_json_ref_counts(self, json_schema: JsonSchemaValue) -> dict[JsonRef, int]:
"""Get all values corresponding to the key '$ref' anywhere in the json_schema."""
json_refs: dict[JsonRef, int] = Counter()
def _add_json_refs(schema: Any) -> None:
if isinstance(schema, dict):
if '$ref' in schema:
json_ref = JsonRef(schema['$ref'])
if not isinstance(json_ref, str):
return # in this case, '$ref' might have been the name of a property
already_visited = json_ref in json_refs
json_refs[json_ref] += 1
if already_visited:
return # prevent recursion on a definition that was already visited
defs_ref = self.json_to_defs_refs[json_ref]
if defs_ref in self._core_defs_invalid_for_json_schema:
raise self._core_defs_invalid_for_json_schema[defs_ref]
_add_json_refs(self.definitions[defs_ref])
for v in schema.values():
_add_json_refs(v)
elif isinstance(schema, list):
for v in schema:
_add_json_refs(v)
_add_json_refs(json_schema)
return json_refs
def handle_invalid_for_json_schema(self, schema: CoreSchemaOrField, error_info: str) -> JsonSchemaValue:
raise PydanticInvalidForJsonSchema(f'Cannot generate a JsonSchema for {error_info}')
def emit_warning(self, kind: JsonSchemaWarningKind, detail: str) -> None:
"""This method simply emits PydanticJsonSchemaWarnings based on handling in the `warning_message` method."""
message = self.render_warning_message(kind, detail)
if message is not None:
warnings.warn(message, PydanticJsonSchemaWarning)
def render_warning_message(self, kind: JsonSchemaWarningKind, detail: str) -> str | None:
"""This method is responsible for ignoring warnings as desired, and for formatting the warning messages.
You can override the value of `ignored_warning_kinds` in a subclass of GenerateJsonSchema
to modify what warnings are generated. If you want more control, you can override this method;
just return None in situations where you don't want warnings to be emitted.
Args:
kind: The kind of warning to render. It can be one of the following:
- 'skipped-choice': A choice field was skipped because it had no valid choices.
- 'non-serializable-default': A default value was skipped because it was not JSON-serializable.
detail: A string with additional details about the warning.
Returns:
The formatted warning message, or `None` if no warning should be emitted.
"""
if kind in self.ignored_warning_kinds:
return None
return f'{detail} [{kind}]'
def _build_definitions_remapping(self) -> _DefinitionsRemapping:
defs_to_json: dict[DefsRef, JsonRef] = {}
for defs_refs in self._prioritized_defsref_choices.values():
for defs_ref in defs_refs:
json_ref = JsonRef(self.ref_template.format(model=defs_ref))
defs_to_json[defs_ref] = json_ref
return _DefinitionsRemapping.from_prioritized_choices(
self._prioritized_defsref_choices, defs_to_json, self.definitions
)
def _garbage_collect_definitions(self, schema: JsonSchemaValue) -> None:
visited_defs_refs: set[DefsRef] = set()
unvisited_json_refs = _get_all_json_refs(schema)
while unvisited_json_refs:
next_json_ref = unvisited_json_refs.pop()
next_defs_ref = self.json_to_defs_refs[next_json_ref]
if next_defs_ref in visited_defs_refs:
continue
visited_defs_refs.add(next_defs_ref)
unvisited_json_refs.update(_get_all_json_refs(self.definitions[next_defs_ref]))
self.definitions = {k: v for k, v in self.definitions.items() if k in visited_defs_refs}
# ##### Start JSON Schema Generation Functions #####
def model_json_schema(
cls: type[BaseModel] | type[PydanticDataclass],
by_alias: bool = True,
ref_template: str = DEFAULT_REF_TEMPLATE,
schema_generator: type[GenerateJsonSchema] = GenerateJsonSchema,
mode: JsonSchemaMode = 'validation',
) -> dict[str, Any]:
"""Utility function to generate a JSON Schema for a model.
Args:
cls: The model class to generate a JSON Schema for.
by_alias: If `True` (the default), fields will be serialized according to their alias.
If `False`, fields will be serialized according to their attribute name.
ref_template: The template to use for generating JSON Schema references.
schema_generator: The class to use for generating the JSON Schema.
mode: The mode to use for generating the JSON Schema. It can be one of the following:
- 'validation': Generate a JSON Schema for validating data.
- 'serialization': Generate a JSON Schema for serializing data.
Returns:
The generated JSON Schema.
"""
schema_generator_instance = schema_generator(by_alias=by_alias, ref_template=ref_template)
if isinstance(cls.__pydantic_validator__, _mock_val_ser.MockValSer):
cls.__pydantic_validator__.rebuild()
assert '__pydantic_core_schema__' in cls.__dict__, 'this is a bug! please report it'
return schema_generator_instance.generate(cls.__pydantic_core_schema__, mode=mode)
def models_json_schema(
models: Sequence[tuple[type[BaseModel] | type[PydanticDataclass], JsonSchemaMode]],
*,
by_alias: bool = True,
title: str | None = None,
description: str | None = None,
ref_template: str = DEFAULT_REF_TEMPLATE,
schema_generator: type[GenerateJsonSchema] = GenerateJsonSchema,
) -> tuple[dict[tuple[type[BaseModel] | type[PydanticDataclass], JsonSchemaMode], JsonSchemaValue], JsonSchemaValue]:
"""Utility function to generate a JSON Schema for multiple models.
Args:
models: A sequence of tuples of the form (model, mode).
by_alias: Whether field aliases should be used as keys in the generated JSON Schema.
title: The title of the generated JSON Schema.
description: The description of the generated JSON Schema.
ref_template: The reference template to use for generating JSON Schema references.
schema_generator: The schema generator to use for generating the JSON Schema.
Returns:
A tuple where:
- The first element is a dictionary whose keys are tuples of JSON schema key type and JSON mode, and
whose values are the JSON schema corresponding to that pair of inputs. (These schemas may have
JsonRef references to definitions that are defined in the second returned element.)
- The second element is a JSON schema containing all definitions referenced in the first returned
element, along with the optional title and description keys.
"""
for cls, _ in models:
if isinstance(cls.__pydantic_validator__, _mock_val_ser.MockValSer):
cls.__pydantic_validator__.rebuild()
instance = schema_generator(by_alias=by_alias, ref_template=ref_template)
inputs = [(m, mode, m.__pydantic_core_schema__) for m, mode in models]
json_schemas_map, definitions = instance.generate_definitions(inputs)
json_schema: dict[str, Any] = {}
if definitions:
json_schema['$defs'] = definitions
if title:
json_schema['title'] = title
if description:
json_schema['description'] = description
return json_schemas_map, json_schema
# ##### End JSON Schema Generation Functions #####
_Json = Union[Dict[str, Any], List[Any], str, int, float, bool, None]
_JsonDict = Dict[str, _Json]
_HashableJson = Union[Tuple[Tuple[str, Any], ...], Tuple[Any, ...], str, int, float, bool, None]
def _deduplicate_schemas(schemas: Iterable[_JsonDict]) -> list[_JsonDict]:
return list({_make_json_hashable(schema): schema for schema in schemas}.values())
def _make_json_hashable(value: _Json) -> _HashableJson:
if isinstance(value, dict):
return tuple(sorted((k, _make_json_hashable(v)) for k, v in value.items()))
elif isinstance(value, list):
return tuple(_make_json_hashable(v) for v in value)
else:
return value
def _sort_json_schema(value: JsonSchemaValue, parent_key: str | None = None) -> JsonSchemaValue:
if isinstance(value, dict):
sorted_dict: dict[str, JsonSchemaValue] = {}
keys = value.keys()
if parent_key != 'properties':
keys = sorted(keys)
for key in keys:
sorted_dict[key] = _sort_json_schema(value[key], parent_key=key)
return sorted_dict
elif isinstance(value, list):
sorted_list: list[JsonSchemaValue] = []
for item in value: # type: ignore
sorted_list.append(_sort_json_schema(item))
return sorted_list # type: ignore
else:
return value
@dataclasses.dataclass(**_internal_dataclass.slots_true)
class WithJsonSchema:
"""Add this as an annotation on a field to override the (base) JSON schema that would be generated for that field.
This provides a way to set a JSON schema for types that would otherwise raise errors when producing a JSON schema,
such as Callable, or types that have an is-instance core schema, without needing to go so far as creating a
custom subclass of pydantic.json_schema.GenerateJsonSchema.
Note that any _modifications_ to the schema that would normally be made (such as setting the title for model fields)
will still be performed.
If `mode` is set this will only apply to that schema generation mode, allowing you
to set different json schemas for validation and serialization.
"""
json_schema: JsonSchemaValue | None
mode: Literal['validation', 'serialization'] | None = None
def __get_pydantic_json_schema__(
self, core_schema: core_schema.CoreSchema, handler: GetJsonSchemaHandler
) -> JsonSchemaValue:
mode = self.mode or handler.mode
if mode != handler.mode:
return handler(core_schema)
if self.json_schema is None:
# This exception is handled in pydantic.json_schema.GenerateJsonSchema._named_required_fields_schema
raise PydanticOmit
else:
return self.json_schema
def __hash__(self) -> int:
return hash(type(self.mode))
@dataclasses.dataclass(**_internal_dataclass.slots_true)
class Examples:
"""Add examples to a JSON schema.
Examples should be a map of example names (strings)
to example values (any valid JSON).
If `mode` is set this will only apply to that schema generation mode,
allowing you to add different examples for validation and serialization.
"""
examples: dict[str, Any]
mode: Literal['validation', 'serialization'] | None = None
def __get_pydantic_json_schema__(
self, core_schema: core_schema.CoreSchema, handler: GetJsonSchemaHandler
) -> JsonSchemaValue:
mode = self.mode or handler.mode
json_schema = handler(core_schema)
if mode != handler.mode:
return json_schema
examples = json_schema.get('examples', {})
examples.update(to_jsonable_python(self.examples))
json_schema['examples'] = examples
return json_schema
def __hash__(self) -> int:
return hash(type(self.mode))
def _get_all_json_refs(item: Any) -> set[JsonRef]:
"""Get all the definitions references from a JSON schema."""
refs: set[JsonRef] = set()
if isinstance(item, dict):
for key, value in item.items():
if key == '$ref' and isinstance(value, str):
# the isinstance check ensures that '$ref' isn't the name of a property, etc.
refs.add(JsonRef(value))
elif isinstance(value, dict):
refs.update(_get_all_json_refs(value))
elif isinstance(value, list):
for item in value:
refs.update(_get_all_json_refs(item))
elif isinstance(item, list):
for item in item:
refs.update(_get_all_json_refs(item))
return refs
AnyType = TypeVar('AnyType')
if TYPE_CHECKING:
SkipJsonSchema = Annotated[AnyType, ...]
else:
@dataclasses.dataclass(**_internal_dataclass.slots_true)
class SkipJsonSchema:
"""Add this as an annotation on a field to skip generating a JSON schema for that field.
Example:
```py
from pydantic import BaseModel
from pydantic.json_schema import SkipJsonSchema
class Model(BaseModel):
a: int | SkipJsonSchema[None] = None
print(Model.model_json_schema())
#> {'properties': {'a': {'default': None, 'title': 'A', 'type': 'integer'}}, 'title': 'Model', 'type': 'object'}
```
"""
def __class_getitem__(cls, item: AnyType) -> AnyType:
return Annotated[item, cls()]
def __get_pydantic_json_schema__(
self, core_schema: CoreSchema, handler: GetJsonSchemaHandler
) -> JsonSchemaValue:
raise PydanticOmit
def __hash__(self) -> int:
return hash(type(self))
def _get_typed_dict_config(schema: core_schema.TypedDictSchema) -> ConfigDict:
metadata = _core_metadata.CoreMetadataHandler(schema).metadata
cls = metadata.get('pydantic_typed_dict_cls')
if cls is not None:
try:
return _decorators.get_attribute_from_bases(cls, '__pydantic_config__')
except AttributeError:
pass
return {}