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# ext/associationproxy.py
# Copyright (C) 2005-2024 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: https://www.opensource.org/licenses/mit-license.php
"""Contain the ``AssociationProxy`` class.
The ``AssociationProxy`` is a Python property object which provides
transparent proxied access to the endpoint of an association object.
See the example ``examples/association/proxied_association.py``.
"""
from __future__ import annotations
import operator
import typing
from typing import AbstractSet
from typing import Any
from typing import Callable
from typing import cast
from typing import Collection
from typing import Dict
from typing import Generic
from typing import ItemsView
from typing import Iterable
from typing import Iterator
from typing import KeysView
from typing import List
from typing import Mapping
from typing import MutableMapping
from typing import MutableSequence
from typing import MutableSet
from typing import NoReturn
from typing import Optional
from typing import overload
from typing import Set
from typing import Tuple
from typing import Type
from typing import TypeVar
from typing import Union
from typing import ValuesView
from .. import ColumnElement
from .. import exc
from .. import inspect
from .. import orm
from .. import util
from ..orm import collections
from ..orm import InspectionAttrExtensionType
from ..orm import interfaces
from ..orm import ORMDescriptor
from ..orm.base import SQLORMOperations
from ..orm.interfaces import _AttributeOptions
from ..orm.interfaces import _DCAttributeOptions
from ..orm.interfaces import _DEFAULT_ATTRIBUTE_OPTIONS
from ..sql import operators
from ..sql import or_
from ..sql.base import _NoArg
from ..util.typing import Literal
from ..util.typing import Protocol
from ..util.typing import Self
from ..util.typing import SupportsIndex
from ..util.typing import SupportsKeysAndGetItem
if typing.TYPE_CHECKING:
from ..orm.interfaces import MapperProperty
from ..orm.interfaces import PropComparator
from ..orm.mapper import Mapper
from ..sql._typing import _ColumnExpressionArgument
from ..sql._typing import _InfoType
_T = TypeVar("_T", bound=Any)
_T_co = TypeVar("_T_co", bound=Any, covariant=True)
_T_con = TypeVar("_T_con", bound=Any, contravariant=True)
_S = TypeVar("_S", bound=Any)
_KT = TypeVar("_KT", bound=Any)
_VT = TypeVar("_VT", bound=Any)
def association_proxy(
target_collection: str,
attr: str,
*,
creator: Optional[_CreatorProtocol] = None,
getset_factory: Optional[_GetSetFactoryProtocol] = None,
proxy_factory: Optional[_ProxyFactoryProtocol] = None,
proxy_bulk_set: Optional[_ProxyBulkSetProtocol] = None,
info: Optional[_InfoType] = None,
cascade_scalar_deletes: bool = False,
create_on_none_assignment: bool = False,
init: Union[_NoArg, bool] = _NoArg.NO_ARG,
repr: Union[_NoArg, bool] = _NoArg.NO_ARG, # noqa: A002
default: Optional[Any] = _NoArg.NO_ARG,
default_factory: Union[_NoArg, Callable[[], _T]] = _NoArg.NO_ARG,
compare: Union[_NoArg, bool] = _NoArg.NO_ARG,
kw_only: Union[_NoArg, bool] = _NoArg.NO_ARG,
) -> AssociationProxy[Any]:
r"""Return a Python property implementing a view of a target
attribute which references an attribute on members of the
target.
The returned value is an instance of :class:`.AssociationProxy`.
Implements a Python property representing a relationship as a collection
of simpler values, or a scalar value. The proxied property will mimic
the collection type of the target (list, dict or set), or, in the case of
a one to one relationship, a simple scalar value.
:param target_collection: Name of the attribute that is the immediate
target. This attribute is typically mapped by
:func:`~sqlalchemy.orm.relationship` to link to a target collection, but
can also be a many-to-one or non-scalar relationship.
:param attr: Attribute on the associated instance or instances that
are available on instances of the target object.
:param creator: optional.
Defines custom behavior when new items are added to the proxied
collection.
By default, adding new items to the collection will trigger a
construction of an instance of the target object, passing the given
item as a positional argument to the target constructor. For cases
where this isn't sufficient, :paramref:`.association_proxy.creator`
can supply a callable that will construct the object in the
appropriate way, given the item that was passed.
For list- and set- oriented collections, a single argument is
passed to the callable. For dictionary oriented collections, two
arguments are passed, corresponding to the key and value.
The :paramref:`.association_proxy.creator` callable is also invoked
for scalar (i.e. many-to-one, one-to-one) relationships. If the
current value of the target relationship attribute is ``None``, the
callable is used to construct a new object. If an object value already
exists, the given attribute value is populated onto that object.
.. seealso::
:ref:`associationproxy_creator`
:param cascade_scalar_deletes: when True, indicates that setting
the proxied value to ``None``, or deleting it via ``del``, should
also remove the source object. Only applies to scalar attributes.
Normally, removing the proxied target will not remove the proxy
source, as this object may have other state that is still to be
kept.
.. versionadded:: 1.3
.. seealso::
:ref:`cascade_scalar_deletes` - complete usage example
:param create_on_none_assignment: when True, indicates that setting
the proxied value to ``None`` should **create** the source object
if it does not exist, using the creator. Only applies to scalar
attributes. This is mutually exclusive
vs. the :paramref:`.assocation_proxy.cascade_scalar_deletes`.
.. versionadded:: 2.0.18
:param init: Specific to :ref:`orm_declarative_native_dataclasses`,
specifies if the mapped attribute should be part of the ``__init__()``
method as generated by the dataclass process.
.. versionadded:: 2.0.0b4
:param repr: Specific to :ref:`orm_declarative_native_dataclasses`,
specifies if the attribute established by this :class:`.AssociationProxy`
should be part of the ``__repr__()`` method as generated by the dataclass
process.
.. versionadded:: 2.0.0b4
:param default_factory: Specific to
:ref:`orm_declarative_native_dataclasses`, specifies a default-value
generation function that will take place as part of the ``__init__()``
method as generated by the dataclass process.
.. versionadded:: 2.0.0b4
:param compare: Specific to
:ref:`orm_declarative_native_dataclasses`, indicates if this field
should be included in comparison operations when generating the
``__eq__()`` and ``__ne__()`` methods for the mapped class.
.. versionadded:: 2.0.0b4
:param kw_only: Specific to :ref:`orm_declarative_native_dataclasses`,
indicates if this field should be marked as keyword-only when generating
the ``__init__()`` method as generated by the dataclass process.
.. versionadded:: 2.0.0b4
:param info: optional, will be assigned to
:attr:`.AssociationProxy.info` if present.
The following additional parameters involve injection of custom behaviors
within the :class:`.AssociationProxy` object and are for advanced use
only:
:param getset_factory: Optional. Proxied attribute access is
automatically handled by routines that get and set values based on
the `attr` argument for this proxy.
If you would like to customize this behavior, you may supply a
`getset_factory` callable that produces a tuple of `getter` and
`setter` functions. The factory is called with two arguments, the
abstract type of the underlying collection and this proxy instance.
:param proxy_factory: Optional. The type of collection to emulate is
determined by sniffing the target collection. If your collection
type can't be determined by duck typing or you'd like to use a
different collection implementation, you may supply a factory
function to produce those collections. Only applicable to
non-scalar relationships.
:param proxy_bulk_set: Optional, use with proxy_factory.
"""
return AssociationProxy(
target_collection,
attr,
creator=creator,
getset_factory=getset_factory,
proxy_factory=proxy_factory,
proxy_bulk_set=proxy_bulk_set,
info=info,
cascade_scalar_deletes=cascade_scalar_deletes,
create_on_none_assignment=create_on_none_assignment,
attribute_options=_AttributeOptions(
init, repr, default, default_factory, compare, kw_only
),
)
class AssociationProxyExtensionType(InspectionAttrExtensionType):
ASSOCIATION_PROXY = "ASSOCIATION_PROXY"
"""Symbol indicating an :class:`.InspectionAttr` that's
of type :class:`.AssociationProxy`.
Is assigned to the :attr:`.InspectionAttr.extension_type`
attribute.
"""
class _GetterProtocol(Protocol[_T_co]):
def __call__(self, instance: Any) -> _T_co: ...
# mypy 0.990 we are no longer allowed to make this Protocol[_T_con]
class _SetterProtocol(Protocol): ...
class _PlainSetterProtocol(_SetterProtocol, Protocol[_T_con]):
def __call__(self, instance: Any, value: _T_con) -> None: ...
class _DictSetterProtocol(_SetterProtocol, Protocol[_T_con]):
def __call__(self, instance: Any, key: Any, value: _T_con) -> None: ...
# mypy 0.990 we are no longer allowed to make this Protocol[_T_con]
class _CreatorProtocol(Protocol): ...
class _PlainCreatorProtocol(_CreatorProtocol, Protocol[_T_con]):
def __call__(self, value: _T_con) -> Any: ...
class _KeyCreatorProtocol(_CreatorProtocol, Protocol[_T_con]):
def __call__(self, key: Any, value: Optional[_T_con]) -> Any: ...
class _LazyCollectionProtocol(Protocol[_T]):
def __call__(
self,
) -> Union[
MutableSet[_T], MutableMapping[Any, _T], MutableSequence[_T]
]: ...
class _GetSetFactoryProtocol(Protocol):
def __call__(
self,
collection_class: Optional[Type[Any]],
assoc_instance: AssociationProxyInstance[Any],
) -> Tuple[_GetterProtocol[Any], _SetterProtocol]: ...
class _ProxyFactoryProtocol(Protocol):
def __call__(
self,
lazy_collection: _LazyCollectionProtocol[Any],
creator: _CreatorProtocol,
value_attr: str,
parent: AssociationProxyInstance[Any],
) -> Any: ...
class _ProxyBulkSetProtocol(Protocol):
def __call__(
self, proxy: _AssociationCollection[Any], collection: Iterable[Any]
) -> None: ...
class _AssociationProxyProtocol(Protocol[_T]):
"""describes the interface of :class:`.AssociationProxy`
without including descriptor methods in the interface."""
creator: Optional[_CreatorProtocol]
key: str
target_collection: str
value_attr: str
cascade_scalar_deletes: bool
create_on_none_assignment: bool
getset_factory: Optional[_GetSetFactoryProtocol]
proxy_factory: Optional[_ProxyFactoryProtocol]
proxy_bulk_set: Optional[_ProxyBulkSetProtocol]
@util.ro_memoized_property
def info(self) -> _InfoType: ...
def for_class(
self, class_: Type[Any], obj: Optional[object] = None
) -> AssociationProxyInstance[_T]: ...
def _default_getset(
self, collection_class: Any
) -> Tuple[_GetterProtocol[Any], _SetterProtocol]: ...
class AssociationProxy(
interfaces.InspectionAttrInfo,
ORMDescriptor[_T],
_DCAttributeOptions,
_AssociationProxyProtocol[_T],
):
"""A descriptor that presents a read/write view of an object attribute."""
is_attribute = True
extension_type = AssociationProxyExtensionType.ASSOCIATION_PROXY
def __init__(
self,
target_collection: str,
attr: str,
*,
creator: Optional[_CreatorProtocol] = None,
getset_factory: Optional[_GetSetFactoryProtocol] = None,
proxy_factory: Optional[_ProxyFactoryProtocol] = None,
proxy_bulk_set: Optional[_ProxyBulkSetProtocol] = None,
info: Optional[_InfoType] = None,
cascade_scalar_deletes: bool = False,
create_on_none_assignment: bool = False,
attribute_options: Optional[_AttributeOptions] = None,
):
"""Construct a new :class:`.AssociationProxy`.
The :class:`.AssociationProxy` object is typically constructed using
the :func:`.association_proxy` constructor function. See the
description of :func:`.association_proxy` for a description of all
parameters.
"""
self.target_collection = target_collection
self.value_attr = attr
self.creator = creator
self.getset_factory = getset_factory
self.proxy_factory = proxy_factory
self.proxy_bulk_set = proxy_bulk_set
if cascade_scalar_deletes and create_on_none_assignment:
raise exc.ArgumentError(
"The cascade_scalar_deletes and create_on_none_assignment "
"parameters are mutually exclusive."
)
self.cascade_scalar_deletes = cascade_scalar_deletes
self.create_on_none_assignment = create_on_none_assignment
self.key = "_%s_%s_%s" % (
type(self).__name__,
target_collection,
id(self),
)
if info:
self.info = info # type: ignore
if (
attribute_options
and attribute_options != _DEFAULT_ATTRIBUTE_OPTIONS
):
self._has_dataclass_arguments = True
self._attribute_options = attribute_options
else:
self._has_dataclass_arguments = False
self._attribute_options = _DEFAULT_ATTRIBUTE_OPTIONS
@overload
def __get__(
self, instance: Literal[None], owner: Literal[None]
) -> Self: ...
@overload
def __get__(
self, instance: Literal[None], owner: Any
) -> AssociationProxyInstance[_T]: ...
@overload
def __get__(self, instance: object, owner: Any) -> _T: ...
def __get__(
self, instance: object, owner: Any
) -> Union[AssociationProxyInstance[_T], _T, AssociationProxy[_T]]:
if owner is None:
return self
inst = self._as_instance(owner, instance)
if inst:
return inst.get(instance)
assert instance is None
return self
def __set__(self, instance: object, values: _T) -> None:
class_ = type(instance)
self._as_instance(class_, instance).set(instance, values)
def __delete__(self, instance: object) -> None:
class_ = type(instance)
self._as_instance(class_, instance).delete(instance)
def for_class(
self, class_: Type[Any], obj: Optional[object] = None
) -> AssociationProxyInstance[_T]:
r"""Return the internal state local to a specific mapped class.
E.g., given a class ``User``::
class User(Base):
# ...
keywords = association_proxy('kws', 'keyword')
If we access this :class:`.AssociationProxy` from
:attr:`_orm.Mapper.all_orm_descriptors`, and we want to view the
target class for this proxy as mapped by ``User``::
inspect(User).all_orm_descriptors["keywords"].for_class(User).target_class
This returns an instance of :class:`.AssociationProxyInstance` that
is specific to the ``User`` class. The :class:`.AssociationProxy`
object remains agnostic of its parent class.
:param class\_: the class that we are returning state for.
:param obj: optional, an instance of the class that is required
if the attribute refers to a polymorphic target, e.g. where we have
to look at the type of the actual destination object to get the
complete path.
.. versionadded:: 1.3 - :class:`.AssociationProxy` no longer stores
any state specific to a particular parent class; the state is now
stored in per-class :class:`.AssociationProxyInstance` objects.
"""
return self._as_instance(class_, obj)
def _as_instance(
self, class_: Any, obj: Any
) -> AssociationProxyInstance[_T]:
try:
inst = class_.__dict__[self.key + "_inst"]
except KeyError:
inst = None
# avoid exception context
if inst is None:
owner = self._calc_owner(class_)
if owner is not None:
inst = AssociationProxyInstance.for_proxy(self, owner, obj)
setattr(class_, self.key + "_inst", inst)
else:
inst = None
if inst is not None and not inst._is_canonical:
# the AssociationProxyInstance can't be generalized
# since the proxied attribute is not on the targeted
# class, only on subclasses of it, which might be
# different. only return for the specific
# object's current value
return inst._non_canonical_get_for_object(obj) # type: ignore
else:
return inst # type: ignore # TODO
def _calc_owner(self, target_cls: Any) -> Any:
# we might be getting invoked for a subclass
# that is not mapped yet, in some declarative situations.
# save until we are mapped
try:
insp = inspect(target_cls)
except exc.NoInspectionAvailable:
# can't find a mapper, don't set owner. if we are a not-yet-mapped
# subclass, we can also scan through __mro__ to find a mapped
# class, but instead just wait for us to be called again against a
# mapped class normally.
return None
else:
return insp.mapper.class_manager.class_
def _default_getset(
self, collection_class: Any
) -> Tuple[_GetterProtocol[Any], _SetterProtocol]:
attr = self.value_attr
_getter = operator.attrgetter(attr)
def getter(instance: Any) -> Optional[Any]:
return _getter(instance) if instance is not None else None
if collection_class is dict:
def dict_setter(instance: Any, k: Any, value: Any) -> None:
setattr(instance, attr, value)
return getter, dict_setter
else:
def plain_setter(o: Any, v: Any) -> None:
setattr(o, attr, v)
return getter, plain_setter
def __repr__(self) -> str:
return "AssociationProxy(%r, %r)" % (
self.target_collection,
self.value_attr,
)
# the pep-673 Self type does not work in Mypy for a "hybrid"
# style method that returns type or Self, so for one specific case
# we still need to use the pre-pep-673 workaround.
_Self = TypeVar("_Self", bound="AssociationProxyInstance[Any]")
class AssociationProxyInstance(SQLORMOperations[_T]):
"""A per-class object that serves class- and object-specific results.
This is used by :class:`.AssociationProxy` when it is invoked
in terms of a specific class or instance of a class, i.e. when it is
used as a regular Python descriptor.
When referring to the :class:`.AssociationProxy` as a normal Python
descriptor, the :class:`.AssociationProxyInstance` is the object that
actually serves the information. Under normal circumstances, its presence
is transparent::
>>> User.keywords.scalar
False
In the special case that the :class:`.AssociationProxy` object is being
accessed directly, in order to get an explicit handle to the
:class:`.AssociationProxyInstance`, use the
:meth:`.AssociationProxy.for_class` method::
proxy_state = inspect(User).all_orm_descriptors["keywords"].for_class(User)
# view if proxy object is scalar or not
>>> proxy_state.scalar
False
.. versionadded:: 1.3
""" # noqa
collection_class: Optional[Type[Any]]
parent: _AssociationProxyProtocol[_T]
def __init__(
self,
parent: _AssociationProxyProtocol[_T],
owning_class: Type[Any],
target_class: Type[Any],
value_attr: str,
):
self.parent = parent
self.key = parent.key
self.owning_class = owning_class
self.target_collection = parent.target_collection
self.collection_class = None
self.target_class = target_class
self.value_attr = value_attr
target_class: Type[Any]
"""The intermediary class handled by this
:class:`.AssociationProxyInstance`.
Intercepted append/set/assignment events will result
in the generation of new instances of this class.
"""
@classmethod
def for_proxy(
cls,
parent: AssociationProxy[_T],
owning_class: Type[Any],
parent_instance: Any,
) -> AssociationProxyInstance[_T]:
target_collection = parent.target_collection
value_attr = parent.value_attr
prop = cast(
"orm.RelationshipProperty[_T]",
orm.class_mapper(owning_class).get_property(target_collection),
)
# this was never asserted before but this should be made clear.
if not isinstance(prop, orm.RelationshipProperty):
raise NotImplementedError(
"association proxy to a non-relationship "
"intermediary is not supported"
) from None
target_class = prop.mapper.class_
try:
target_assoc = cast(
"AssociationProxyInstance[_T]",
cls._cls_unwrap_target_assoc_proxy(target_class, value_attr),
)
except AttributeError:
# the proxied attribute doesn't exist on the target class;
# return an "ambiguous" instance that will work on a per-object
# basis
return AmbiguousAssociationProxyInstance(
parent, owning_class, target_class, value_attr
)
except Exception as err:
raise exc.InvalidRequestError(
f"Association proxy received an unexpected error when "
f"trying to retreive attribute "
f'"{target_class.__name__}.{parent.value_attr}" from '
f'class "{target_class.__name__}": {err}'
) from err
else:
return cls._construct_for_assoc(
target_assoc, parent, owning_class, target_class, value_attr
)
@classmethod
def _construct_for_assoc(
cls,
target_assoc: Optional[AssociationProxyInstance[_T]],
parent: _AssociationProxyProtocol[_T],
owning_class: Type[Any],
target_class: Type[Any],
value_attr: str,
) -> AssociationProxyInstance[_T]:
if target_assoc is not None:
return ObjectAssociationProxyInstance(
parent, owning_class, target_class, value_attr
)
attr = getattr(target_class, value_attr)
if not hasattr(attr, "_is_internal_proxy"):
return AmbiguousAssociationProxyInstance(
parent, owning_class, target_class, value_attr
)
is_object = attr._impl_uses_objects
if is_object:
return ObjectAssociationProxyInstance(
parent, owning_class, target_class, value_attr
)
else:
return ColumnAssociationProxyInstance(
parent, owning_class, target_class, value_attr
)
def _get_property(self) -> MapperProperty[Any]:
return orm.class_mapper(self.owning_class).get_property(
self.target_collection
)
@property
def _comparator(self) -> PropComparator[Any]:
return getattr( # type: ignore
self.owning_class, self.target_collection
).comparator
def __clause_element__(self) -> NoReturn:
raise NotImplementedError(
"The association proxy can't be used as a plain column "
"expression; it only works inside of a comparison expression"
)
@classmethod
def _cls_unwrap_target_assoc_proxy(
cls, target_class: Any, value_attr: str
) -> Optional[AssociationProxyInstance[_T]]:
attr = getattr(target_class, value_attr)
assert not isinstance(attr, AssociationProxy)
if isinstance(attr, AssociationProxyInstance):
return attr
return None
@util.memoized_property
def _unwrap_target_assoc_proxy(
self,
) -> Optional[AssociationProxyInstance[_T]]:
return self._cls_unwrap_target_assoc_proxy(
self.target_class, self.value_attr
)
@property
def remote_attr(self) -> SQLORMOperations[_T]:
"""The 'remote' class attribute referenced by this
:class:`.AssociationProxyInstance`.
.. seealso::
:attr:`.AssociationProxyInstance.attr`
:attr:`.AssociationProxyInstance.local_attr`
"""
return cast(
"SQLORMOperations[_T]", getattr(self.target_class, self.value_attr)
)
@property
def local_attr(self) -> SQLORMOperations[Any]:
"""The 'local' class attribute referenced by this
:class:`.AssociationProxyInstance`.
.. seealso::
:attr:`.AssociationProxyInstance.attr`
:attr:`.AssociationProxyInstance.remote_attr`
"""
return cast(
"SQLORMOperations[Any]",
getattr(self.owning_class, self.target_collection),
)
@property
def attr(self) -> Tuple[SQLORMOperations[Any], SQLORMOperations[_T]]:
"""Return a tuple of ``(local_attr, remote_attr)``.
This attribute was originally intended to facilitate using the
:meth:`_query.Query.join` method to join across the two relationships
at once, however this makes use of a deprecated calling style.
To use :meth:`_sql.select.join` or :meth:`_orm.Query.join` with
an association proxy, the current method is to make use of the
:attr:`.AssociationProxyInstance.local_attr` and
:attr:`.AssociationProxyInstance.remote_attr` attributes separately::
stmt = (
select(Parent).
join(Parent.proxied.local_attr).
join(Parent.proxied.remote_attr)
)
A future release may seek to provide a more succinct join pattern
for association proxy attributes.
.. seealso::
:attr:`.AssociationProxyInstance.local_attr`
:attr:`.AssociationProxyInstance.remote_attr`
"""
return (self.local_attr, self.remote_attr)
@util.memoized_property
def scalar(self) -> bool:
"""Return ``True`` if this :class:`.AssociationProxyInstance`
proxies a scalar relationship on the local side."""
scalar = not self._get_property().uselist
if scalar:
self._initialize_scalar_accessors()
return scalar
@util.memoized_property
def _value_is_scalar(self) -> bool:
return (
not self._get_property()
.mapper.get_property(self.value_attr)
.uselist
)
@property
def _target_is_object(self) -> bool:
raise NotImplementedError()
_scalar_get: _GetterProtocol[_T]
_scalar_set: _PlainSetterProtocol[_T]
def _initialize_scalar_accessors(self) -> None:
if self.parent.getset_factory:
get, set_ = self.parent.getset_factory(None, self)
else:
get, set_ = self.parent._default_getset(None)
self._scalar_get, self._scalar_set = get, cast(
"_PlainSetterProtocol[_T]", set_
)
def _default_getset(
self, collection_class: Any
) -> Tuple[_GetterProtocol[Any], _SetterProtocol]:
attr = self.value_attr
_getter = operator.attrgetter(attr)
def getter(instance: Any) -> Optional[_T]:
return _getter(instance) if instance is not None else None
if collection_class is dict:
def dict_setter(instance: Any, k: Any, value: _T) -> None:
setattr(instance, attr, value)
return getter, dict_setter
else:
def plain_setter(o: Any, v: _T) -> None:
setattr(o, attr, v)
return getter, plain_setter
@util.ro_non_memoized_property
def info(self) -> _InfoType:
return self.parent.info
@overload
def get(self: _Self, obj: Literal[None]) -> _Self: ...
@overload
def get(self, obj: Any) -> _T: ...
def get(
self, obj: Any
) -> Union[Optional[_T], AssociationProxyInstance[_T]]:
if obj is None:
return self
proxy: _T
if self.scalar:
target = getattr(obj, self.target_collection)
return self._scalar_get(target)
else:
try:
# If the owning instance is reborn (orm session resurrect,
# etc.), refresh the proxy cache.
creator_id, self_id, proxy = cast(
"Tuple[int, int, _T]", getattr(obj, self.key)
)
except AttributeError:
pass
else:
if id(obj) == creator_id and id(self) == self_id:
assert self.collection_class is not None
return proxy
self.collection_class, proxy = self._new(
_lazy_collection(obj, self.target_collection)
)
setattr(obj, self.key, (id(obj), id(self), proxy))
return proxy
def set(self, obj: Any, values: _T) -> None:
if self.scalar:
creator = cast(
"_PlainCreatorProtocol[_T]",
(
self.parent.creator
if self.parent.creator
else self.target_class
),
)
target = getattr(obj, self.target_collection)
if target is None:
if (
values is None
and not self.parent.create_on_none_assignment
):
return
setattr(obj, self.target_collection, creator(values))
else:
self._scalar_set(target, values)
if values is None and self.parent.cascade_scalar_deletes:
setattr(obj, self.target_collection, None)
else:
proxy = self.get(obj)
assert self.collection_class is not None
if proxy is not values:
proxy._bulk_replace(self, values)
def delete(self, obj: Any) -> None:
if self.owning_class is None:
self._calc_owner(obj, None)
if self.scalar:
target = getattr(obj, self.target_collection)
if target is not None:
delattr(target, self.value_attr)
delattr(obj, self.target_collection)
def _new(
self, lazy_collection: _LazyCollectionProtocol[_T]
) -> Tuple[Type[Any], _T]:
creator = (
self.parent.creator
if self.parent.creator is not None
else cast("_CreatorProtocol", self.target_class)
)
collection_class = util.duck_type_collection(lazy_collection())
if collection_class is None:
raise exc.InvalidRequestError(
f"lazy collection factory did not return a "
f"valid collection type, got {collection_class}"
)
if self.parent.proxy_factory:
return (
collection_class,
self.parent.proxy_factory(
lazy_collection, creator, self.value_attr, self
),
)
if self.parent.getset_factory:
getter, setter = self.parent.getset_factory(collection_class, self)
else:
getter, setter = self.parent._default_getset(collection_class)
if collection_class is list:
return (
collection_class,
cast(
_T,
_AssociationList(
lazy_collection, creator, getter, setter, self
),
),
)
elif collection_class is dict:
return (
collection_class,
cast(
_T,
_AssociationDict(
lazy_collection, creator, getter, setter, self
),
),
)
elif collection_class is set:
return (
collection_class,
cast(
_T,
_AssociationSet(
lazy_collection, creator, getter, setter, self
),
),
)
else:
raise exc.ArgumentError(
"could not guess which interface to use for "
'collection_class "%s" backing "%s"; specify a '
"proxy_factory and proxy_bulk_set manually"
% (self.collection_class, self.target_collection)
)
def _set(
self, proxy: _AssociationCollection[Any], values: Iterable[Any]
) -> None:
if self.parent.proxy_bulk_set:
self.parent.proxy_bulk_set(proxy, values)
elif self.collection_class is list:
cast("_AssociationList[Any]", proxy).extend(values)
elif self.collection_class is dict:
cast("_AssociationDict[Any, Any]", proxy).update(values)
elif self.collection_class is set:
cast("_AssociationSet[Any]", proxy).update(values)
else:
raise exc.ArgumentError(
"no proxy_bulk_set supplied for custom "
"collection_class implementation"
)
def _inflate(self, proxy: _AssociationCollection[Any]) -> None:
creator = (
self.parent.creator
and self.parent.creator
or cast(_CreatorProtocol, self.target_class)
)
if self.parent.getset_factory:
getter, setter = self.parent.getset_factory(
self.collection_class, self
)
else:
getter, setter = self.parent._default_getset(self.collection_class)
proxy.creator = creator
proxy.getter = getter
proxy.setter = setter
def _criterion_exists(
self,
criterion: Optional[_ColumnExpressionArgument[bool]] = None,
**kwargs: Any,
) -> ColumnElement[bool]:
is_has = kwargs.pop("is_has", None)
target_assoc = self._unwrap_target_assoc_proxy
if target_assoc is not None:
inner = target_assoc._criterion_exists(
criterion=criterion, **kwargs
)
return self._comparator._criterion_exists(inner)
if self._target_is_object:
attr = getattr(self.target_class, self.value_attr)
value_expr = attr.comparator._criterion_exists(criterion, **kwargs)
else:
if kwargs:
raise exc.ArgumentError(
"Can't apply keyword arguments to column-targeted "
"association proxy; use =="
)
elif is_has and criterion is not None:
raise exc.ArgumentError(
"Non-empty has() not allowed for "
"column-targeted association proxy; use =="
)
value_expr = criterion
return self._comparator._criterion_exists(value_expr)
def any(
self,
criterion: Optional[_ColumnExpressionArgument[bool]] = None,
**kwargs: Any,
) -> ColumnElement[bool]:
"""Produce a proxied 'any' expression using EXISTS.
This expression will be a composed product
using the :meth:`.Relationship.Comparator.any`
and/or :meth:`.Relationship.Comparator.has`
operators of the underlying proxied attributes.
"""
if self._unwrap_target_assoc_proxy is None and (
self.scalar
and (not self._target_is_object or self._value_is_scalar)
):
raise exc.InvalidRequestError(
"'any()' not implemented for scalar attributes. Use has()."
)
return self._criterion_exists(
criterion=criterion, is_has=False, **kwargs
)
def has(
self,
criterion: Optional[_ColumnExpressionArgument[bool]] = None,
**kwargs: Any,
) -> ColumnElement[bool]:
"""Produce a proxied 'has' expression using EXISTS.
This expression will be a composed product
using the :meth:`.Relationship.Comparator.any`
and/or :meth:`.Relationship.Comparator.has`
operators of the underlying proxied attributes.
"""
if self._unwrap_target_assoc_proxy is None and (
not self.scalar
or (self._target_is_object and not self._value_is_scalar)
):
raise exc.InvalidRequestError(
"'has()' not implemented for collections. Use any()."
)
return self._criterion_exists(
criterion=criterion, is_has=True, **kwargs
)
def __repr__(self) -> str:
return "%s(%r)" % (self.__class__.__name__, self.parent)
class AmbiguousAssociationProxyInstance(AssociationProxyInstance[_T]):
"""an :class:`.AssociationProxyInstance` where we cannot determine
the type of target object.
"""
_is_canonical = False
def _ambiguous(self) -> NoReturn:
raise AttributeError(
"Association proxy %s.%s refers to an attribute '%s' that is not "
"directly mapped on class %s; therefore this operation cannot "
"proceed since we don't know what type of object is referred "
"towards"
% (
self.owning_class.__name__,
self.target_collection,
self.value_attr,
self.target_class,
)
)
def get(self, obj: Any) -> Any:
if obj is None:
return self
else:
return super().get(obj)
def __eq__(self, obj: object) -> NoReturn:
self._ambiguous()
def __ne__(self, obj: object) -> NoReturn:
self._ambiguous()
def any(
self,
criterion: Optional[_ColumnExpressionArgument[bool]] = None,
**kwargs: Any,
) -> NoReturn:
self._ambiguous()
def has(
self,
criterion: Optional[_ColumnExpressionArgument[bool]] = None,
**kwargs: Any,
) -> NoReturn:
self._ambiguous()
@util.memoized_property
def _lookup_cache(self) -> Dict[Type[Any], AssociationProxyInstance[_T]]:
# mapping of <subclass>->AssociationProxyInstance.
# e.g. proxy is A-> A.b -> B -> B.b_attr, but B.b_attr doesn't exist;
# only B1(B) and B2(B) have "b_attr", keys in here would be B1, B2
return {}
def _non_canonical_get_for_object(
self, parent_instance: Any
) -> AssociationProxyInstance[_T]:
if parent_instance is not None:
actual_obj = getattr(parent_instance, self.target_collection)
if actual_obj is not None:
try:
insp = inspect(actual_obj)
except exc.NoInspectionAvailable:
pass
else:
mapper = insp.mapper
instance_class = mapper.class_
if instance_class not in self._lookup_cache:
self._populate_cache(instance_class, mapper)
try:
return self._lookup_cache[instance_class]
except KeyError:
pass
# no object or ambiguous object given, so return "self", which
# is a proxy with generally only instance-level functionality
return self
def _populate_cache(
self, instance_class: Any, mapper: Mapper[Any]
) -> None:
prop = orm.class_mapper(self.owning_class).get_property(
self.target_collection
)
if mapper.isa(prop.mapper):
target_class = instance_class
try:
target_assoc = self._cls_unwrap_target_assoc_proxy(
target_class, self.value_attr
)
except AttributeError:
pass
else:
self._lookup_cache[instance_class] = self._construct_for_assoc(
cast("AssociationProxyInstance[_T]", target_assoc),
self.parent,
self.owning_class,
target_class,
self.value_attr,
)
class ObjectAssociationProxyInstance(AssociationProxyInstance[_T]):
"""an :class:`.AssociationProxyInstance` that has an object as a target."""
_target_is_object: bool = True
_is_canonical = True
def contains(self, other: Any, **kw: Any) -> ColumnElement[bool]:
"""Produce a proxied 'contains' expression using EXISTS.
This expression will be a composed product
using the :meth:`.Relationship.Comparator.any`,
:meth:`.Relationship.Comparator.has`,
and/or :meth:`.Relationship.Comparator.contains`
operators of the underlying proxied attributes.
"""
target_assoc = self._unwrap_target_assoc_proxy
if target_assoc is not None:
return self._comparator._criterion_exists(
target_assoc.contains(other)
if not target_assoc.scalar
else target_assoc == other
)
elif (
self._target_is_object
and self.scalar
and not self._value_is_scalar
):
return self._comparator.has(
getattr(self.target_class, self.value_attr).contains(other)
)
elif self._target_is_object and self.scalar and self._value_is_scalar:
raise exc.InvalidRequestError(
"contains() doesn't apply to a scalar object endpoint; use =="
)
else:
return self._comparator._criterion_exists(
**{self.value_attr: other}
)
def __eq__(self, obj: Any) -> ColumnElement[bool]: # type: ignore[override] # noqa: E501
# note the has() here will fail for collections; eq_()
# is only allowed with a scalar.
if obj is None:
return or_(
self._comparator.has(**{self.value_attr: obj}),
self._comparator == None,
)
else:
return self._comparator.has(**{self.value_attr: obj})
def __ne__(self, obj: Any) -> ColumnElement[bool]: # type: ignore[override] # noqa: E501
# note the has() here will fail for collections; eq_()
# is only allowed with a scalar.
return self._comparator.has(
getattr(self.target_class, self.value_attr) != obj
)
class ColumnAssociationProxyInstance(AssociationProxyInstance[_T]):
"""an :class:`.AssociationProxyInstance` that has a database column as a
target.
"""
_target_is_object: bool = False
_is_canonical = True
def __eq__(self, other: Any) -> ColumnElement[bool]: # type: ignore[override] # noqa: E501
# special case "is None" to check for no related row as well
expr = self._criterion_exists(
self.remote_attr.operate(operators.eq, other)
)
if other is None:
return or_(expr, self._comparator == None)
else:
return expr
def operate(
self, op: operators.OperatorType, *other: Any, **kwargs: Any
) -> ColumnElement[Any]:
return self._criterion_exists(
self.remote_attr.operate(op, *other, **kwargs)
)
class _lazy_collection(_LazyCollectionProtocol[_T]):
def __init__(self, obj: Any, target: str):
self.parent = obj
self.target = target
def __call__(
self,
) -> Union[MutableSet[_T], MutableMapping[Any, _T], MutableSequence[_T]]:
return getattr(self.parent, self.target) # type: ignore[no-any-return]
def __getstate__(self) -> Any:
return {"obj": self.parent, "target": self.target}
def __setstate__(self, state: Any) -> None:
self.parent = state["obj"]
self.target = state["target"]
_IT = TypeVar("_IT", bound="Any")
"""instance type - this is the type of object inside a collection.
this is not the same as the _T of AssociationProxy and
AssociationProxyInstance itself, which will often refer to the
collection[_IT] type.
"""
class _AssociationCollection(Generic[_IT]):
getter: _GetterProtocol[_IT]
"""A function. Given an associated object, return the 'value'."""
creator: _CreatorProtocol
"""
A function that creates new target entities. Given one parameter:
value. This assertion is assumed::
obj = creator(somevalue)
assert getter(obj) == somevalue
"""
parent: AssociationProxyInstance[_IT]
setter: _SetterProtocol
"""A function. Given an associated object and a value, store that
value on the object.
"""
lazy_collection: _LazyCollectionProtocol[_IT]
"""A callable returning a list-based collection of entities (usually an
object attribute managed by a SQLAlchemy relationship())"""
def __init__(
self,
lazy_collection: _LazyCollectionProtocol[_IT],
creator: _CreatorProtocol,
getter: _GetterProtocol[_IT],
setter: _SetterProtocol,
parent: AssociationProxyInstance[_IT],
):
"""Constructs an _AssociationCollection.
This will always be a subclass of either _AssociationList,
_AssociationSet, or _AssociationDict.
"""
self.lazy_collection = lazy_collection
self.creator = creator
self.getter = getter
self.setter = setter
self.parent = parent
if typing.TYPE_CHECKING:
col: Collection[_IT]
else:
col = property(lambda self: self.lazy_collection())
def __len__(self) -> int:
return len(self.col)
def __bool__(self) -> bool:
return bool(self.col)
def __getstate__(self) -> Any:
return {"parent": self.parent, "lazy_collection": self.lazy_collection}
def __setstate__(self, state: Any) -> None:
self.parent = state["parent"]
self.lazy_collection = state["lazy_collection"]
self.parent._inflate(self)
def clear(self) -> None:
raise NotImplementedError()
class _AssociationSingleItem(_AssociationCollection[_T]):
setter: _PlainSetterProtocol[_T]
creator: _PlainCreatorProtocol[_T]
def _create(self, value: _T) -> Any:
return self.creator(value)
def _get(self, object_: Any) -> _T:
return self.getter(object_)
def _bulk_replace(
self, assoc_proxy: AssociationProxyInstance[Any], values: Iterable[_IT]
) -> None:
self.clear()
assoc_proxy._set(self, values)
class _AssociationList(_AssociationSingleItem[_T], MutableSequence[_T]):
"""Generic, converting, list-to-list proxy."""
col: MutableSequence[_T]
def _set(self, object_: Any, value: _T) -> None:
self.setter(object_, value)
@overload
def __getitem__(self, index: int) -> _T: ...
@overload
def __getitem__(self, index: slice) -> MutableSequence[_T]: ...
def __getitem__(
self, index: Union[int, slice]
) -> Union[_T, MutableSequence[_T]]:
if not isinstance(index, slice):
return self._get(self.col[index])
else:
return [self._get(member) for member in self.col[index]]
@overload
def __setitem__(self, index: int, value: _T) -> None: ...
@overload
def __setitem__(self, index: slice, value: Iterable[_T]) -> None: ...
def __setitem__(
self, index: Union[int, slice], value: Union[_T, Iterable[_T]]
) -> None:
if not isinstance(index, slice):
self._set(self.col[index], cast("_T", value))
else:
if index.stop is None:
stop = len(self)
elif index.stop < 0:
stop = len(self) + index.stop
else:
stop = index.stop
step = index.step or 1
start = index.start or 0
rng = list(range(index.start or 0, stop, step))
sized_value = list(value)
if step == 1:
for i in rng:
del self[start]
i = start
for item in sized_value:
self.insert(i, item)
i += 1
else:
if len(sized_value) != len(rng):
raise ValueError(
"attempt to assign sequence of size %s to "
"extended slice of size %s"
% (len(sized_value), len(rng))
)
for i, item in zip(rng, value):
self._set(self.col[i], item)
@overload
def __delitem__(self, index: int) -> None: ...
@overload
def __delitem__(self, index: slice) -> None: ...
def __delitem__(self, index: Union[slice, int]) -> None:
del self.col[index]
def __contains__(self, value: object) -> bool:
for member in self.col:
# testlib.pragma exempt:__eq__
if self._get(member) == value:
return True
return False
def __iter__(self) -> Iterator[_T]:
"""Iterate over proxied values.
For the actual domain objects, iterate over .col instead or
just use the underlying collection directly from its property
on the parent.
"""
for member in self.col:
yield self._get(member)
return
def append(self, value: _T) -> None:
col = self.col
item = self._create(value)
col.append(item)
def count(self, value: Any) -> int:
count = 0
for v in self:
if v == value:
count += 1
return count
def extend(self, values: Iterable[_T]) -> None:
for v in values:
self.append(v)
def insert(self, index: int, value: _T) -> None:
self.col[index:index] = [self._create(value)]
def pop(self, index: int = -1) -> _T:
return self.getter(self.col.pop(index))
def remove(self, value: _T) -> None:
for i, val in enumerate(self):
if val == value:
del self.col[i]
return
raise ValueError("value not in list")
def reverse(self) -> NoReturn:
"""Not supported, use reversed(mylist)"""
raise NotImplementedError()
def sort(self) -> NoReturn:
"""Not supported, use sorted(mylist)"""
raise NotImplementedError()
def clear(self) -> None:
del self.col[0 : len(self.col)]
def __eq__(self, other: object) -> bool:
return list(self) == other
def __ne__(self, other: object) -> bool:
return list(self) != other
def __lt__(self, other: List[_T]) -> bool:
return list(self) < other
def __le__(self, other: List[_T]) -> bool:
return list(self) <= other
def __gt__(self, other: List[_T]) -> bool:
return list(self) > other
def __ge__(self, other: List[_T]) -> bool:
return list(self) >= other
def __add__(self, other: List[_T]) -> List[_T]:
try:
other = list(other)
except TypeError:
return NotImplemented
return list(self) + other
def __radd__(self, other: List[_T]) -> List[_T]:
try:
other = list(other)
except TypeError:
return NotImplemented
return other + list(self)
def __mul__(self, n: SupportsIndex) -> List[_T]:
if not isinstance(n, int):
return NotImplemented
return list(self) * n
def __rmul__(self, n: SupportsIndex) -> List[_T]:
if not isinstance(n, int):
return NotImplemented
return n * list(self)
def __iadd__(self, iterable: Iterable[_T]) -> Self:
self.extend(iterable)
return self
def __imul__(self, n: SupportsIndex) -> Self:
# unlike a regular list *=, proxied __imul__ will generate unique
# backing objects for each copy. *= on proxied lists is a bit of
# a stretch anyhow, and this interpretation of the __imul__ contract
# is more plausibly useful than copying the backing objects.
if not isinstance(n, int):
raise NotImplementedError()
if n == 0:
self.clear()
elif n > 1:
self.extend(list(self) * (n - 1))
return self
if typing.TYPE_CHECKING:
# TODO: no idea how to do this without separate "stub"
def index(
self, value: Any, start: int = ..., stop: int = ...
) -> int: ...
else:
def index(self, value: Any, *arg) -> int:
ls = list(self)
return ls.index(value, *arg)
def copy(self) -> List[_T]:
return list(self)
def __repr__(self) -> str:
return repr(list(self))
def __hash__(self) -> NoReturn:
raise TypeError("%s objects are unhashable" % type(self).__name__)
if not typing.TYPE_CHECKING:
for func_name, func in list(locals().items()):
if (
callable(func)
and func.__name__ == func_name
and not func.__doc__
and hasattr(list, func_name)
):
func.__doc__ = getattr(list, func_name).__doc__
del func_name, func
class _AssociationDict(_AssociationCollection[_VT], MutableMapping[_KT, _VT]):
"""Generic, converting, dict-to-dict proxy."""
setter: _DictSetterProtocol[_VT]
creator: _KeyCreatorProtocol[_VT]
col: MutableMapping[_KT, Optional[_VT]]
def _create(self, key: _KT, value: Optional[_VT]) -> Any:
return self.creator(key, value)
def _get(self, object_: Any) -> _VT:
return self.getter(object_)
def _set(self, object_: Any, key: _KT, value: _VT) -> None:
return self.setter(object_, key, value)
def __getitem__(self, key: _KT) -> _VT:
return self._get(self.col[key])
def __setitem__(self, key: _KT, value: _VT) -> None:
if key in self.col:
self._set(self.col[key], key, value)
else:
self.col[key] = self._create(key, value)
def __delitem__(self, key: _KT) -> None:
del self.col[key]
def __contains__(self, key: object) -> bool:
return key in self.col
def __iter__(self) -> Iterator[_KT]:
return iter(self.col.keys())
def clear(self) -> None:
self.col.clear()
def __eq__(self, other: object) -> bool:
return dict(self) == other
def __ne__(self, other: object) -> bool:
return dict(self) != other
def __repr__(self) -> str:
return repr(dict(self))
@overload
def get(self, __key: _KT) -> Optional[_VT]: ...
@overload
def get(self, __key: _KT, default: Union[_VT, _T]) -> Union[_VT, _T]: ...
def get(
self, key: _KT, default: Optional[Union[_VT, _T]] = None
) -> Union[_VT, _T, None]:
try:
return self[key]
except KeyError:
return default
def setdefault(self, key: _KT, default: Optional[_VT] = None) -> _VT:
# TODO: again, no idea how to create an actual MutableMapping.
# default must allow None, return type can't include None,
# the stub explicitly allows for default of None with a cryptic message
# "This overload should be allowed only if the value type is
# compatible with None.".
if key not in self.col:
self.col[key] = self._create(key, default)
return default # type: ignore
else:
return self[key]
def keys(self) -> KeysView[_KT]:
return self.col.keys()
def items(self) -> ItemsView[_KT, _VT]:
return ItemsView(self)
def values(self) -> ValuesView[_VT]:
return ValuesView(self)
@overload
def pop(self, __key: _KT) -> _VT: ...
@overload
def pop(
self, __key: _KT, default: Union[_VT, _T] = ...
) -> Union[_VT, _T]: ...
def pop(self, __key: _KT, *arg: Any, **kw: Any) -> Union[_VT, _T]:
member = self.col.pop(__key, *arg, **kw)
return self._get(member)
def popitem(self) -> Tuple[_KT, _VT]:
item = self.col.popitem()
return (item[0], self._get(item[1]))
@overload
def update(
self, __m: SupportsKeysAndGetItem[_KT, _VT], **kwargs: _VT
) -> None: ...
@overload
def update(
self, __m: Iterable[tuple[_KT, _VT]], **kwargs: _VT
) -> None: ...
@overload
def update(self, **kwargs: _VT) -> None: ...
def update(self, *a: Any, **kw: Any) -> None:
up: Dict[_KT, _VT] = {}
up.update(*a, **kw)
for key, value in up.items():
self[key] = value
def _bulk_replace(
self,
assoc_proxy: AssociationProxyInstance[Any],
values: Mapping[_KT, _VT],
) -> None:
existing = set(self)
constants = existing.intersection(values or ())
additions = set(values or ()).difference(constants)
removals = existing.difference(constants)
for key, member in values.items() or ():
if key in additions:
self[key] = member
elif key in constants:
self[key] = member
for key in removals:
del self[key]
def copy(self) -> Dict[_KT, _VT]:
return dict(self.items())
def __hash__(self) -> NoReturn:
raise TypeError("%s objects are unhashable" % type(self).__name__)
if not typing.TYPE_CHECKING:
for func_name, func in list(locals().items()):
if (
callable(func)
and func.__name__ == func_name
and not func.__doc__
and hasattr(dict, func_name)
):
func.__doc__ = getattr(dict, func_name).__doc__
del func_name, func
class _AssociationSet(_AssociationSingleItem[_T], MutableSet[_T]):
"""Generic, converting, set-to-set proxy."""
col: MutableSet[_T]
def __len__(self) -> int:
return len(self.col)
def __bool__(self) -> bool:
if self.col:
return True
else:
return False
def __contains__(self, __o: object) -> bool:
for member in self.col:
if self._get(member) == __o:
return True
return False
def __iter__(self) -> Iterator[_T]:
"""Iterate over proxied values.
For the actual domain objects, iterate over .col instead or just use
the underlying collection directly from its property on the parent.
"""
for member in self.col:
yield self._get(member)
return
def add(self, __element: _T) -> None:
if __element not in self:
self.col.add(self._create(__element))
# for discard and remove, choosing a more expensive check strategy rather
# than call self.creator()
def discard(self, __element: _T) -> None:
for member in self.col:
if self._get(member) == __element:
self.col.discard(member)
break
def remove(self, __element: _T) -> None:
for member in self.col:
if self._get(member) == __element:
self.col.discard(member)
return
raise KeyError(__element)
def pop(self) -> _T:
if not self.col:
raise KeyError("pop from an empty set")
member = self.col.pop()
return self._get(member)
def update(self, *s: Iterable[_T]) -> None:
for iterable in s:
for value in iterable:
self.add(value)
def _bulk_replace(self, assoc_proxy: Any, values: Iterable[_T]) -> None:
existing = set(self)
constants = existing.intersection(values or ())
additions = set(values or ()).difference(constants)
removals = existing.difference(constants)
appender = self.add
remover = self.remove
for member in values or ():
if member in additions:
appender(member)
elif member in constants:
appender(member)
for member in removals:
remover(member)
def __ior__( # type: ignore
self, other: AbstractSet[_S]
) -> MutableSet[Union[_T, _S]]:
if not collections._set_binops_check_strict(self, other):
raise NotImplementedError()
for value in other:
self.add(value)
return self
def _set(self) -> Set[_T]:
return set(iter(self))
def union(self, *s: Iterable[_S]) -> MutableSet[Union[_T, _S]]:
return set(self).union(*s)
def __or__(self, __s: AbstractSet[_S]) -> MutableSet[Union[_T, _S]]:
return self.union(__s)
def difference(self, *s: Iterable[Any]) -> MutableSet[_T]:
return set(self).difference(*s)
def __sub__(self, s: AbstractSet[Any]) -> MutableSet[_T]:
return self.difference(s)
def difference_update(self, *s: Iterable[Any]) -> None:
for other in s:
for value in other:
self.discard(value)
def __isub__(self, s: AbstractSet[Any]) -> Self:
if not collections._set_binops_check_strict(self, s):
raise NotImplementedError()
for value in s:
self.discard(value)
return self
def intersection(self, *s: Iterable[Any]) -> MutableSet[_T]:
return set(self).intersection(*s)
def __and__(self, s: AbstractSet[Any]) -> MutableSet[_T]:
return self.intersection(s)
def intersection_update(self, *s: Iterable[Any]) -> None:
for other in s:
want, have = self.intersection(other), set(self)
remove, add = have - want, want - have
for value in remove:
self.remove(value)
for value in add:
self.add(value)
def __iand__(self, s: AbstractSet[Any]) -> Self:
if not collections._set_binops_check_strict(self, s):
raise NotImplementedError()
want = self.intersection(s)
have: Set[_T] = set(self)
remove, add = have - want, want - have
for value in remove:
self.remove(value)
for value in add:
self.add(value)
return self
def symmetric_difference(self, __s: Iterable[_T]) -> MutableSet[_T]:
return set(self).symmetric_difference(__s)
def __xor__(self, s: AbstractSet[_S]) -> MutableSet[Union[_T, _S]]:
return self.symmetric_difference(s)
def symmetric_difference_update(self, other: Iterable[Any]) -> None:
want, have = self.symmetric_difference(other), set(self)
remove, add = have - want, want - have
for value in remove:
self.remove(value)
for value in add:
self.add(value)
def __ixor__(self, other: AbstractSet[_S]) -> MutableSet[Union[_T, _S]]: # type: ignore # noqa: E501
if not collections._set_binops_check_strict(self, other):
raise NotImplementedError()
self.symmetric_difference_update(other)
return self
def issubset(self, __s: Iterable[Any]) -> bool:
return set(self).issubset(__s)
def issuperset(self, __s: Iterable[Any]) -> bool:
return set(self).issuperset(__s)
def clear(self) -> None:
self.col.clear()
def copy(self) -> AbstractSet[_T]:
return set(self)
def __eq__(self, other: object) -> bool:
return set(self) == other
def __ne__(self, other: object) -> bool:
return set(self) != other
def __lt__(self, other: AbstractSet[Any]) -> bool:
return set(self) < other
def __le__(self, other: AbstractSet[Any]) -> bool:
return set(self) <= other
def __gt__(self, other: AbstractSet[Any]) -> bool:
return set(self) > other
def __ge__(self, other: AbstractSet[Any]) -> bool:
return set(self) >= other
def __repr__(self) -> str:
return repr(set(self))
def __hash__(self) -> NoReturn:
raise TypeError("%s objects are unhashable" % type(self).__name__)
if not typing.TYPE_CHECKING:
for func_name, func in list(locals().items()):
if (
callable(func)
and func.__name__ == func_name
and not func.__doc__
and hasattr(set, func_name)
):
func.__doc__ = getattr(set, func_name).__doc__
del func_name, func