Загрузить файлы в «venv/Lib/site-packages/sqlalchemy/orm»
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3253
venv/Lib/site-packages/sqlalchemy/orm/events.py
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3253
venv/Lib/site-packages/sqlalchemy/orm/events.py
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237
venv/Lib/site-packages/sqlalchemy/orm/exc.py
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237
venv/Lib/site-packages/sqlalchemy/orm/exc.py
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# orm/exc.py
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# Copyright (C) 2005-2026 the SQLAlchemy authors and contributors
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# <see AUTHORS file>
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#
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# This module is part of SQLAlchemy and is released under
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# the MIT License: https://www.opensource.org/licenses/mit-license.php
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"""SQLAlchemy ORM exceptions."""
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from __future__ import annotations
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from typing import Any
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from typing import Optional
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from typing import Tuple
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from typing import Type
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from typing import TYPE_CHECKING
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from typing import TypeVar
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from .util import _mapper_property_as_plain_name
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from .. import exc as sa_exc
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from .. import util
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from ..exc import MultipleResultsFound # noqa
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from ..exc import NoResultFound # noqa
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if TYPE_CHECKING:
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from .interfaces import LoaderStrategy
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from .interfaces import MapperProperty
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from .state import InstanceState
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_T = TypeVar("_T", bound=Any)
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NO_STATE = (AttributeError, KeyError)
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"""Exception types that may be raised by instrumentation implementations."""
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class StaleDataError(sa_exc.SQLAlchemyError):
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"""An operation encountered database state that is unaccounted for.
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Conditions which cause this to happen include:
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* A flush may have attempted to update or delete rows
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and an unexpected number of rows were matched during
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the UPDATE or DELETE statement. Note that when
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version_id_col is used, rows in UPDATE or DELETE statements
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are also matched against the current known version
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identifier.
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* A mapped object with version_id_col was refreshed,
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and the version number coming back from the database does
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not match that of the object itself.
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* A object is detached from its parent object, however
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the object was previously attached to a different parent
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identity which was garbage collected, and a decision
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cannot be made if the new parent was really the most
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recent "parent".
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"""
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ConcurrentModificationError = StaleDataError
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class FlushError(sa_exc.SQLAlchemyError):
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"""A invalid condition was detected during flush()."""
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class MappedAnnotationError(sa_exc.ArgumentError):
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"""Raised when ORM annotated declarative cannot interpret the
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expression present inside of the :class:`.Mapped` construct.
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.. versionadded:: 2.0.40
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"""
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class UnmappedError(sa_exc.InvalidRequestError):
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"""Base for exceptions that involve expected mappings not present."""
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class ObjectDereferencedError(sa_exc.SQLAlchemyError):
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"""An operation cannot complete due to an object being garbage
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collected.
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"""
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class DetachedInstanceError(sa_exc.SQLAlchemyError):
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"""An attempt to access unloaded attributes on a
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mapped instance that is detached."""
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code = "bhk3"
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class UnmappedInstanceError(UnmappedError):
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"""An mapping operation was requested for an unknown instance."""
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@util.preload_module("sqlalchemy.orm.base")
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def __init__(self, obj: object, msg: Optional[str] = None):
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base = util.preloaded.orm_base
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if not msg:
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try:
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base.class_mapper(type(obj))
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name = _safe_cls_name(type(obj))
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msg = (
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"Class %r is mapped, but this instance lacks "
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"instrumentation. This occurs when the instance "
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"is created before sqlalchemy.orm.mapper(%s) "
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"was called." % (name, name)
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)
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except UnmappedClassError:
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msg = f"Class '{_safe_cls_name(type(obj))}' is not mapped"
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if isinstance(obj, type):
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msg += (
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"; was a class (%s) supplied where an instance was "
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"required?" % _safe_cls_name(obj)
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)
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UnmappedError.__init__(self, msg)
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def __reduce__(self) -> Any:
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return self.__class__, (None, self.args[0])
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class UnmappedClassError(UnmappedError):
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"""An mapping operation was requested for an unknown class."""
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def __init__(self, cls: Type[_T], msg: Optional[str] = None):
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if not msg:
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msg = _default_unmapped(cls)
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UnmappedError.__init__(self, msg)
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def __reduce__(self) -> Any:
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return self.__class__, (None, self.args[0])
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class ObjectDeletedError(sa_exc.InvalidRequestError):
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"""A refresh operation failed to retrieve the database
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row corresponding to an object's known primary key identity.
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A refresh operation proceeds when an expired attribute is
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accessed on an object, or when :meth:`_query.Query.get` is
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used to retrieve an object which is, upon retrieval, detected
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as expired. A SELECT is emitted for the target row
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based on primary key; if no row is returned, this
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exception is raised.
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The true meaning of this exception is simply that
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no row exists for the primary key identifier associated
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with a persistent object. The row may have been
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deleted, or in some cases the primary key updated
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to a new value, outside of the ORM's management of the target
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object.
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"""
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@util.preload_module("sqlalchemy.orm.base")
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def __init__(self, state: InstanceState[Any], msg: Optional[str] = None):
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base = util.preloaded.orm_base
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if not msg:
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msg = (
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"Instance '%s' has been deleted, or its "
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"row is otherwise not present." % base.state_str(state)
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)
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sa_exc.InvalidRequestError.__init__(self, msg)
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def __reduce__(self) -> Any:
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return self.__class__, (None, self.args[0])
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class UnmappedColumnError(sa_exc.InvalidRequestError):
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"""Mapping operation was requested on an unknown column."""
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class LoaderStrategyException(sa_exc.InvalidRequestError):
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"""A loader strategy for an attribute does not exist."""
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def __init__(
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self,
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applied_to_property_type: Type[Any],
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requesting_property: MapperProperty[Any],
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applies_to: Optional[Type[MapperProperty[Any]]],
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actual_strategy_type: Optional[Type[LoaderStrategy]],
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strategy_key: Tuple[Any, ...],
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):
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if actual_strategy_type is None:
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sa_exc.InvalidRequestError.__init__(
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self,
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"Can't find strategy %s for %s"
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% (strategy_key, requesting_property),
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)
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else:
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assert applies_to is not None
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sa_exc.InvalidRequestError.__init__(
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self,
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'Can\'t apply "%s" strategy to property "%s", '
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'which is a "%s"; this loader strategy is intended '
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'to be used with a "%s".'
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% (
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util.clsname_as_plain_name(actual_strategy_type),
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requesting_property,
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_mapper_property_as_plain_name(applied_to_property_type),
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_mapper_property_as_plain_name(applies_to),
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),
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)
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def _safe_cls_name(cls: Type[Any]) -> str:
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cls_name: Optional[str]
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try:
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cls_name = ".".join((cls.__module__, cls.__name__))
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except AttributeError:
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cls_name = getattr(cls, "__name__", None)
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if cls_name is None:
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cls_name = repr(cls)
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return cls_name
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@util.preload_module("sqlalchemy.orm.base")
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def _default_unmapped(cls: Type[Any]) -> Optional[str]:
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base = util.preloaded.orm_base
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try:
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mappers = base.manager_of_class(cls).mappers # type: ignore
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except (
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UnmappedClassError,
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TypeError,
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) + NO_STATE:
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mappers = {}
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name = _safe_cls_name(cls)
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if not mappers:
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return f"Class '{name}' is not mapped"
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else:
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return None
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302
venv/Lib/site-packages/sqlalchemy/orm/identity.py
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302
venv/Lib/site-packages/sqlalchemy/orm/identity.py
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@@ -0,0 +1,302 @@
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# orm/identity.py
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# Copyright (C) 2005-2026 the SQLAlchemy authors and contributors
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# <see AUTHORS file>
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#
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# This module is part of SQLAlchemy and is released under
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# the MIT License: https://www.opensource.org/licenses/mit-license.php
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from __future__ import annotations
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from typing import Any
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from typing import cast
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from typing import Dict
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from typing import Iterable
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from typing import Iterator
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from typing import List
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from typing import NoReturn
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from typing import Optional
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from typing import Set
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from typing import Tuple
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from typing import TYPE_CHECKING
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from typing import TypeVar
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import weakref
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from . import util as orm_util
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from .. import exc as sa_exc
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if TYPE_CHECKING:
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from ._typing import _IdentityKeyType
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from .state import InstanceState
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_T = TypeVar("_T", bound=Any)
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_O = TypeVar("_O", bound=object)
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class IdentityMap:
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_wr: weakref.ref[IdentityMap]
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_dict: Dict[_IdentityKeyType[Any], Any]
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_modified: Set[InstanceState[Any]]
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def __init__(self) -> None:
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self._dict = {}
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self._modified = set()
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self._wr = weakref.ref(self)
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def _kill(self) -> None:
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self._add_unpresent = _killed # type: ignore
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def all_states(self) -> List[InstanceState[Any]]:
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raise NotImplementedError()
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def contains_state(self, state: InstanceState[Any]) -> bool:
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raise NotImplementedError()
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def __contains__(self, key: _IdentityKeyType[Any]) -> bool:
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raise NotImplementedError()
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def safe_discard(self, state: InstanceState[Any]) -> None:
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raise NotImplementedError()
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def __getitem__(self, key: _IdentityKeyType[_O]) -> _O:
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raise NotImplementedError()
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def get(
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self, key: _IdentityKeyType[_O], default: Optional[_O] = None
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) -> Optional[_O]:
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raise NotImplementedError()
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def fast_get_state(
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self, key: _IdentityKeyType[_O]
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) -> Optional[InstanceState[_O]]:
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raise NotImplementedError()
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def keys(self) -> Iterable[_IdentityKeyType[Any]]:
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return self._dict.keys()
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def values(self) -> Iterable[object]:
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raise NotImplementedError()
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def replace(self, state: InstanceState[_O]) -> Optional[InstanceState[_O]]:
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raise NotImplementedError()
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def add(self, state: InstanceState[Any]) -> bool:
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raise NotImplementedError()
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def _fast_discard(self, state: InstanceState[Any]) -> None:
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raise NotImplementedError()
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def _add_unpresent(
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self, state: InstanceState[Any], key: _IdentityKeyType[Any]
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) -> None:
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"""optional inlined form of add() which can assume item isn't present
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in the map"""
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self.add(state)
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def _manage_incoming_state(self, state: InstanceState[Any]) -> None:
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state._instance_dict = self._wr
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if state.modified:
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self._modified.add(state)
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def _manage_removed_state(self, state: InstanceState[Any]) -> None:
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del state._instance_dict
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if state.modified:
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self._modified.discard(state)
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def _dirty_states(self) -> Set[InstanceState[Any]]:
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return self._modified
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def check_modified(self) -> bool:
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"""return True if any InstanceStates present have been marked
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as 'modified'.
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"""
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return bool(self._modified)
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def has_key(self, key: _IdentityKeyType[Any]) -> bool:
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return key in self
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def __len__(self) -> int:
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return len(self._dict)
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class WeakInstanceDict(IdentityMap):
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_dict: Dict[_IdentityKeyType[Any], InstanceState[Any]]
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def __getitem__(self, key: _IdentityKeyType[_O]) -> _O:
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state = cast("InstanceState[_O]", self._dict[key])
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o = state.obj()
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if o is None:
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raise KeyError(key)
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return o
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def __contains__(self, key: _IdentityKeyType[Any]) -> bool:
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try:
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if key in self._dict:
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state = self._dict[key]
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o = state.obj()
|
||||
else:
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return False
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except KeyError:
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return False
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||||
else:
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return o is not None
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|
||||
def contains_state(self, state: InstanceState[Any]) -> bool:
|
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if state.key in self._dict:
|
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if TYPE_CHECKING:
|
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assert state.key is not None
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try:
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return self._dict[state.key] is state
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except KeyError:
|
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return False
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||||
else:
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return False
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def replace(
|
||||
self, state: InstanceState[Any]
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||||
) -> Optional[InstanceState[Any]]:
|
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assert state.key is not None
|
||||
if state.key in self._dict:
|
||||
try:
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||||
existing = existing_non_none = self._dict[state.key]
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||||
except KeyError:
|
||||
# catch gc removed the key after we just checked for it
|
||||
existing = None
|
||||
else:
|
||||
if existing_non_none is not state:
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||||
self._manage_removed_state(existing_non_none)
|
||||
else:
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return None
|
||||
else:
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||||
existing = None
|
||||
|
||||
self._dict[state.key] = state
|
||||
self._manage_incoming_state(state)
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return existing
|
||||
|
||||
def add(self, state: InstanceState[Any]) -> bool:
|
||||
key = state.key
|
||||
assert key is not None
|
||||
# inline of self.__contains__
|
||||
if key in self._dict:
|
||||
try:
|
||||
existing_state = self._dict[key]
|
||||
except KeyError:
|
||||
# catch gc removed the key after we just checked for it
|
||||
pass
|
||||
else:
|
||||
if existing_state is not state:
|
||||
o = existing_state.obj()
|
||||
if o is not None:
|
||||
raise sa_exc.InvalidRequestError(
|
||||
"Can't attach instance "
|
||||
"%s; another instance with key %s is already "
|
||||
"present in this session."
|
||||
% (orm_util.state_str(state), state.key)
|
||||
)
|
||||
else:
|
||||
return False
|
||||
self._dict[key] = state
|
||||
self._manage_incoming_state(state)
|
||||
return True
|
||||
|
||||
def _add_unpresent(
|
||||
self, state: InstanceState[Any], key: _IdentityKeyType[Any]
|
||||
) -> None:
|
||||
# inlined form of add() called by loading.py
|
||||
self._dict[key] = state
|
||||
state._instance_dict = self._wr
|
||||
|
||||
def fast_get_state(
|
||||
self, key: _IdentityKeyType[_O]
|
||||
) -> Optional[InstanceState[_O]]:
|
||||
return self._dict.get(key)
|
||||
|
||||
def get(
|
||||
self, key: _IdentityKeyType[_O], default: Optional[_O] = None
|
||||
) -> Optional[_O]:
|
||||
if key not in self._dict:
|
||||
return default
|
||||
try:
|
||||
state = cast("InstanceState[_O]", self._dict[key])
|
||||
except KeyError:
|
||||
# catch gc removed the key after we just checked for it
|
||||
return default
|
||||
else:
|
||||
o = state.obj()
|
||||
if o is None:
|
||||
return default
|
||||
return o
|
||||
|
||||
def items(self) -> List[Tuple[_IdentityKeyType[Any], InstanceState[Any]]]:
|
||||
values = self.all_states()
|
||||
result = []
|
||||
for state in values:
|
||||
value = state.obj()
|
||||
key = state.key
|
||||
assert key is not None
|
||||
if value is not None:
|
||||
result.append((key, value))
|
||||
return result
|
||||
|
||||
def values(self) -> List[object]:
|
||||
values = self.all_states()
|
||||
result = []
|
||||
for state in values:
|
||||
value = state.obj()
|
||||
if value is not None:
|
||||
result.append(value)
|
||||
|
||||
return result
|
||||
|
||||
def __iter__(self) -> Iterator[_IdentityKeyType[Any]]:
|
||||
return iter(self.keys())
|
||||
|
||||
def all_states(self) -> List[InstanceState[Any]]:
|
||||
return list(self._dict.values())
|
||||
|
||||
def _fast_discard(self, state: InstanceState[Any]) -> None:
|
||||
# used by InstanceState for state being
|
||||
# GC'ed, inlines _managed_removed_state
|
||||
key = state.key
|
||||
assert key is not None
|
||||
try:
|
||||
st = self._dict[key]
|
||||
except KeyError:
|
||||
# catch gc removed the key after we just checked for it
|
||||
pass
|
||||
else:
|
||||
if st is state:
|
||||
self._dict.pop(key, None)
|
||||
|
||||
def discard(self, state: InstanceState[Any]) -> None:
|
||||
self.safe_discard(state)
|
||||
|
||||
def safe_discard(self, state: InstanceState[Any]) -> None:
|
||||
key = state.key
|
||||
if key in self._dict:
|
||||
assert key is not None
|
||||
try:
|
||||
st = self._dict[key]
|
||||
except KeyError:
|
||||
# catch gc removed the key after we just checked for it
|
||||
pass
|
||||
else:
|
||||
if st is state:
|
||||
self._dict.pop(key, None)
|
||||
self._manage_removed_state(state)
|
||||
|
||||
|
||||
def _killed(state: InstanceState[Any], key: _IdentityKeyType[Any]) -> NoReturn:
|
||||
# external function to avoid creating cycles when assigned to
|
||||
# the IdentityMap
|
||||
raise sa_exc.InvalidRequestError(
|
||||
"Object %s cannot be converted to 'persistent' state, as this "
|
||||
"identity map is no longer valid. Has the owning Session "
|
||||
"been closed?" % orm_util.state_str(state),
|
||||
code="lkrp",
|
||||
)
|
||||
753
venv/Lib/site-packages/sqlalchemy/orm/instrumentation.py
Normal file
753
venv/Lib/site-packages/sqlalchemy/orm/instrumentation.py
Normal file
@@ -0,0 +1,753 @@
|
||||
# orm/instrumentation.py
|
||||
# Copyright (C) 2005-2026 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
|
||||
# mypy: allow-untyped-defs, allow-untyped-calls
|
||||
|
||||
"""Defines SQLAlchemy's system of class instrumentation.
|
||||
|
||||
This module is usually not directly visible to user applications, but
|
||||
defines a large part of the ORM's interactivity.
|
||||
|
||||
instrumentation.py deals with registration of end-user classes
|
||||
for state tracking. It interacts closely with state.py
|
||||
and attributes.py which establish per-instance and per-class-attribute
|
||||
instrumentation, respectively.
|
||||
|
||||
The class instrumentation system can be customized on a per-class
|
||||
or global basis using the :mod:`sqlalchemy.ext.instrumentation`
|
||||
module, which provides the means to build and specify
|
||||
alternate instrumentation forms.
|
||||
|
||||
.. versionchanged: 0.8
|
||||
The instrumentation extension system was moved out of the
|
||||
ORM and into the external :mod:`sqlalchemy.ext.instrumentation`
|
||||
package. When that package is imported, it installs
|
||||
itself within sqlalchemy.orm so that its more comprehensive
|
||||
resolution mechanics take effect.
|
||||
|
||||
"""
|
||||
|
||||
from __future__ import annotations
|
||||
|
||||
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 Iterable
|
||||
from typing import List
|
||||
from typing import Optional
|
||||
from typing import Set
|
||||
from typing import Tuple
|
||||
from typing import Type
|
||||
from typing import TYPE_CHECKING
|
||||
from typing import TypeVar
|
||||
from typing import Union
|
||||
import weakref
|
||||
|
||||
from . import base
|
||||
from . import collections
|
||||
from . import exc
|
||||
from . import interfaces
|
||||
from . import state
|
||||
from ._typing import _O
|
||||
from .attributes import _is_collection_attribute_impl
|
||||
from .. import util
|
||||
from ..event import EventTarget
|
||||
from ..util import HasMemoized
|
||||
from ..util.typing import Literal
|
||||
from ..util.typing import Protocol
|
||||
|
||||
if TYPE_CHECKING:
|
||||
from ._typing import _RegistryType
|
||||
from .attributes import AttributeImpl
|
||||
from .attributes import QueryableAttribute
|
||||
from .collections import _AdaptedCollectionProtocol
|
||||
from .collections import _CollectionFactoryType
|
||||
from .decl_base import _MapperConfig
|
||||
from .events import InstanceEvents
|
||||
from .mapper import Mapper
|
||||
from .state import InstanceState
|
||||
from ..event import dispatcher
|
||||
|
||||
_T = TypeVar("_T", bound=Any)
|
||||
DEL_ATTR = util.symbol("DEL_ATTR")
|
||||
|
||||
|
||||
class _ExpiredAttributeLoaderProto(Protocol):
|
||||
def __call__(
|
||||
self,
|
||||
state: state.InstanceState[Any],
|
||||
toload: Set[str],
|
||||
passive: base.PassiveFlag,
|
||||
) -> None: ...
|
||||
|
||||
|
||||
class _ManagerFactory(Protocol):
|
||||
def __call__(self, class_: Type[_O]) -> ClassManager[_O]: ...
|
||||
|
||||
|
||||
class ClassManager(
|
||||
HasMemoized,
|
||||
Dict[str, "QueryableAttribute[Any]"],
|
||||
Generic[_O],
|
||||
EventTarget,
|
||||
):
|
||||
"""Tracks state information at the class level."""
|
||||
|
||||
dispatch: dispatcher[ClassManager[_O]]
|
||||
|
||||
MANAGER_ATTR = base.DEFAULT_MANAGER_ATTR
|
||||
STATE_ATTR = base.DEFAULT_STATE_ATTR
|
||||
|
||||
_state_setter = staticmethod(util.attrsetter(STATE_ATTR))
|
||||
|
||||
expired_attribute_loader: _ExpiredAttributeLoaderProto
|
||||
"previously known as deferred_scalar_loader"
|
||||
|
||||
init_method: Optional[Callable[..., None]]
|
||||
original_init: Optional[Callable[..., None]] = None
|
||||
|
||||
factory: Optional[_ManagerFactory]
|
||||
|
||||
declarative_scan: Optional[weakref.ref[_MapperConfig]] = None
|
||||
|
||||
registry: _RegistryType
|
||||
|
||||
if not TYPE_CHECKING:
|
||||
# starts as None during setup
|
||||
registry = None
|
||||
|
||||
class_: Type[_O]
|
||||
|
||||
_bases: List[ClassManager[Any]]
|
||||
|
||||
@property
|
||||
@util.deprecated(
|
||||
"1.4",
|
||||
message="The ClassManager.deferred_scalar_loader attribute is now "
|
||||
"named expired_attribute_loader",
|
||||
)
|
||||
def deferred_scalar_loader(self):
|
||||
return self.expired_attribute_loader
|
||||
|
||||
@deferred_scalar_loader.setter
|
||||
@util.deprecated(
|
||||
"1.4",
|
||||
message="The ClassManager.deferred_scalar_loader attribute is now "
|
||||
"named expired_attribute_loader",
|
||||
)
|
||||
def deferred_scalar_loader(self, obj):
|
||||
self.expired_attribute_loader = obj
|
||||
|
||||
def __init__(self, class_):
|
||||
self.class_ = class_
|
||||
self.info = {}
|
||||
self.new_init = None
|
||||
self.local_attrs = {}
|
||||
self.originals = {}
|
||||
self._finalized = False
|
||||
self.factory = None
|
||||
self.init_method = None
|
||||
|
||||
self._bases = [
|
||||
mgr
|
||||
for mgr in cast(
|
||||
"List[Optional[ClassManager[Any]]]",
|
||||
[
|
||||
opt_manager_of_class(base)
|
||||
for base in self.class_.__bases__
|
||||
if isinstance(base, type)
|
||||
],
|
||||
)
|
||||
if mgr is not None
|
||||
]
|
||||
|
||||
for base_ in self._bases:
|
||||
self.update(base_)
|
||||
|
||||
cast(
|
||||
"InstanceEvents", self.dispatch._events
|
||||
)._new_classmanager_instance(class_, self)
|
||||
|
||||
for basecls in class_.__mro__:
|
||||
mgr = opt_manager_of_class(basecls)
|
||||
if mgr is not None:
|
||||
self.dispatch._update(mgr.dispatch)
|
||||
|
||||
self.manage()
|
||||
|
||||
if "__del__" in class_.__dict__:
|
||||
util.warn(
|
||||
"__del__() method on class %s will "
|
||||
"cause unreachable cycles and memory leaks, "
|
||||
"as SQLAlchemy instrumentation often creates "
|
||||
"reference cycles. Please remove this method." % class_
|
||||
)
|
||||
|
||||
def _update_state(
|
||||
self,
|
||||
finalize: bool = False,
|
||||
mapper: Optional[Mapper[_O]] = None,
|
||||
registry: Optional[_RegistryType] = None,
|
||||
declarative_scan: Optional[_MapperConfig] = None,
|
||||
expired_attribute_loader: Optional[
|
||||
_ExpiredAttributeLoaderProto
|
||||
] = None,
|
||||
init_method: Optional[Callable[..., None]] = None,
|
||||
) -> None:
|
||||
if mapper:
|
||||
self.mapper = mapper #
|
||||
if registry:
|
||||
registry._add_manager(self)
|
||||
if declarative_scan:
|
||||
self.declarative_scan = weakref.ref(declarative_scan)
|
||||
if expired_attribute_loader:
|
||||
self.expired_attribute_loader = expired_attribute_loader
|
||||
|
||||
if init_method:
|
||||
assert not self._finalized, (
|
||||
"class is already instrumented, "
|
||||
"init_method %s can't be applied" % init_method
|
||||
)
|
||||
self.init_method = init_method
|
||||
|
||||
if not self._finalized:
|
||||
self.original_init = (
|
||||
self.init_method
|
||||
if self.init_method is not None
|
||||
and self.class_.__init__ is object.__init__
|
||||
else self.class_.__init__
|
||||
)
|
||||
|
||||
if finalize and not self._finalized:
|
||||
self._finalize()
|
||||
|
||||
def _finalize(self) -> None:
|
||||
if self._finalized:
|
||||
return
|
||||
self._finalized = True
|
||||
|
||||
self._instrument_init()
|
||||
|
||||
_instrumentation_factory.dispatch.class_instrument(self.class_)
|
||||
|
||||
def __hash__(self) -> int: # type: ignore[override]
|
||||
return id(self)
|
||||
|
||||
def __eq__(self, other: Any) -> bool:
|
||||
return other is self
|
||||
|
||||
@property
|
||||
def is_mapped(self) -> bool:
|
||||
return "mapper" in self.__dict__
|
||||
|
||||
@HasMemoized.memoized_attribute
|
||||
def _all_key_set(self):
|
||||
return frozenset(self)
|
||||
|
||||
@HasMemoized.memoized_attribute
|
||||
def _collection_impl_keys(self):
|
||||
return frozenset(
|
||||
[attr.key for attr in self.values() if attr.impl.collection]
|
||||
)
|
||||
|
||||
@HasMemoized.memoized_attribute
|
||||
def _scalar_loader_impls(self):
|
||||
return frozenset(
|
||||
[
|
||||
attr.impl
|
||||
for attr in self.values()
|
||||
if attr.impl.accepts_scalar_loader
|
||||
]
|
||||
)
|
||||
|
||||
@HasMemoized.memoized_attribute
|
||||
def _loader_impls(self):
|
||||
return frozenset([attr.impl for attr in self.values()])
|
||||
|
||||
@util.memoized_property
|
||||
def mapper(self) -> Mapper[_O]:
|
||||
# raises unless self.mapper has been assigned
|
||||
raise exc.UnmappedClassError(self.class_)
|
||||
|
||||
def _all_sqla_attributes(self, exclude=None):
|
||||
"""return an iterator of all classbound attributes that are
|
||||
implement :class:`.InspectionAttr`.
|
||||
|
||||
This includes :class:`.QueryableAttribute` as well as extension
|
||||
types such as :class:`.hybrid_property` and
|
||||
:class:`.AssociationProxy`.
|
||||
|
||||
"""
|
||||
|
||||
found: Dict[str, Any] = {}
|
||||
|
||||
# constraints:
|
||||
# 1. yield keys in cls.__dict__ order
|
||||
# 2. if a subclass has the same key as a superclass, include that
|
||||
# key as part of the ordering of the superclass, because an
|
||||
# overridden key is usually installed by the mapper which is going
|
||||
# on a different ordering
|
||||
# 3. don't use getattr() as this fires off descriptors
|
||||
|
||||
for supercls in self.class_.__mro__[0:-1]:
|
||||
inherits = supercls.__mro__[1]
|
||||
for key in supercls.__dict__:
|
||||
found.setdefault(key, supercls)
|
||||
if key in inherits.__dict__:
|
||||
continue
|
||||
val = found[key].__dict__[key]
|
||||
if (
|
||||
isinstance(val, interfaces.InspectionAttr)
|
||||
and val.is_attribute
|
||||
):
|
||||
yield key, val
|
||||
|
||||
def _get_class_attr_mro(self, key, default=None):
|
||||
"""return an attribute on the class without tripping it."""
|
||||
|
||||
for supercls in self.class_.__mro__:
|
||||
if key in supercls.__dict__:
|
||||
return supercls.__dict__[key]
|
||||
else:
|
||||
return default
|
||||
|
||||
def _attr_has_impl(self, key: str) -> bool:
|
||||
"""Return True if the given attribute is fully initialized.
|
||||
|
||||
i.e. has an impl.
|
||||
"""
|
||||
|
||||
return key in self and self[key].impl is not None
|
||||
|
||||
def _subclass_manager(self, cls: Type[_T]) -> ClassManager[_T]:
|
||||
"""Create a new ClassManager for a subclass of this ClassManager's
|
||||
class.
|
||||
|
||||
This is called automatically when attributes are instrumented so that
|
||||
the attributes can be propagated to subclasses against their own
|
||||
class-local manager, without the need for mappers etc. to have already
|
||||
pre-configured managers for the full class hierarchy. Mappers
|
||||
can post-configure the auto-generated ClassManager when needed.
|
||||
|
||||
"""
|
||||
return register_class(cls, finalize=False)
|
||||
|
||||
def _instrument_init(self):
|
||||
self.new_init = _generate_init(self.class_, self, self.original_init)
|
||||
self.install_member("__init__", self.new_init)
|
||||
|
||||
@util.memoized_property
|
||||
def _state_constructor(self) -> Type[state.InstanceState[_O]]:
|
||||
self.dispatch.first_init(self, self.class_)
|
||||
return state.InstanceState
|
||||
|
||||
def manage(self):
|
||||
"""Mark this instance as the manager for its class."""
|
||||
|
||||
setattr(self.class_, self.MANAGER_ATTR, self)
|
||||
|
||||
@util.hybridmethod
|
||||
def manager_getter(self):
|
||||
return _default_manager_getter
|
||||
|
||||
@util.hybridmethod
|
||||
def state_getter(self):
|
||||
"""Return a (instance) -> InstanceState callable.
|
||||
|
||||
"state getter" callables should raise either KeyError or
|
||||
AttributeError if no InstanceState could be found for the
|
||||
instance.
|
||||
"""
|
||||
|
||||
return _default_state_getter
|
||||
|
||||
@util.hybridmethod
|
||||
def dict_getter(self):
|
||||
return _default_dict_getter
|
||||
|
||||
def instrument_attribute(
|
||||
self,
|
||||
key: str,
|
||||
inst: QueryableAttribute[Any],
|
||||
propagated: bool = False,
|
||||
) -> None:
|
||||
if propagated:
|
||||
if key in self.local_attrs:
|
||||
return # don't override local attr with inherited attr
|
||||
else:
|
||||
self.local_attrs[key] = inst
|
||||
self.install_descriptor(key, inst)
|
||||
self._reset_memoizations()
|
||||
self[key] = inst
|
||||
|
||||
for cls in self.class_.__subclasses__():
|
||||
manager = self._subclass_manager(cls)
|
||||
manager.instrument_attribute(key, inst, True)
|
||||
|
||||
def subclass_managers(self, recursive):
|
||||
for cls in self.class_.__subclasses__():
|
||||
mgr = opt_manager_of_class(cls)
|
||||
if mgr is not None and mgr is not self:
|
||||
yield mgr
|
||||
if recursive:
|
||||
yield from mgr.subclass_managers(True)
|
||||
|
||||
def post_configure_attribute(self, key):
|
||||
_instrumentation_factory.dispatch.attribute_instrument(
|
||||
self.class_, key, self[key]
|
||||
)
|
||||
|
||||
def uninstrument_attribute(self, key, propagated=False):
|
||||
if key not in self:
|
||||
return
|
||||
if propagated:
|
||||
if key in self.local_attrs:
|
||||
return # don't get rid of local attr
|
||||
else:
|
||||
del self.local_attrs[key]
|
||||
self.uninstall_descriptor(key)
|
||||
self._reset_memoizations()
|
||||
del self[key]
|
||||
for cls in self.class_.__subclasses__():
|
||||
manager = opt_manager_of_class(cls)
|
||||
if manager:
|
||||
manager.uninstrument_attribute(key, True)
|
||||
|
||||
def unregister(self) -> None:
|
||||
"""remove all instrumentation established by this ClassManager."""
|
||||
|
||||
for key in list(self.originals):
|
||||
self.uninstall_member(key)
|
||||
|
||||
self.mapper = None
|
||||
self.dispatch = None # type: ignore
|
||||
self.new_init = None
|
||||
self.info.clear()
|
||||
|
||||
for key in list(self):
|
||||
if key in self.local_attrs:
|
||||
self.uninstrument_attribute(key)
|
||||
|
||||
if self.MANAGER_ATTR in self.class_.__dict__:
|
||||
delattr(self.class_, self.MANAGER_ATTR)
|
||||
|
||||
def install_descriptor(
|
||||
self, key: str, inst: QueryableAttribute[Any]
|
||||
) -> None:
|
||||
if key in (self.STATE_ATTR, self.MANAGER_ATTR):
|
||||
raise KeyError(
|
||||
"%r: requested attribute name conflicts with "
|
||||
"instrumentation attribute of the same name." % key
|
||||
)
|
||||
setattr(self.class_, key, inst)
|
||||
|
||||
def uninstall_descriptor(self, key: str) -> None:
|
||||
delattr(self.class_, key)
|
||||
|
||||
def install_member(self, key: str, implementation: Any) -> None:
|
||||
if key in (self.STATE_ATTR, self.MANAGER_ATTR):
|
||||
raise KeyError(
|
||||
"%r: requested attribute name conflicts with "
|
||||
"instrumentation attribute of the same name." % key
|
||||
)
|
||||
self.originals.setdefault(key, self.class_.__dict__.get(key, DEL_ATTR))
|
||||
setattr(self.class_, key, implementation)
|
||||
|
||||
def uninstall_member(self, key: str) -> None:
|
||||
original = self.originals.pop(key, None)
|
||||
if original is not DEL_ATTR:
|
||||
setattr(self.class_, key, original)
|
||||
else:
|
||||
delattr(self.class_, key)
|
||||
|
||||
def instrument_collection_class(
|
||||
self, key: str, collection_class: Type[Collection[Any]]
|
||||
) -> _CollectionFactoryType:
|
||||
return collections.prepare_instrumentation(collection_class)
|
||||
|
||||
def initialize_collection(
|
||||
self,
|
||||
key: str,
|
||||
state: InstanceState[_O],
|
||||
factory: _CollectionFactoryType,
|
||||
) -> Tuple[collections.CollectionAdapter, _AdaptedCollectionProtocol]:
|
||||
user_data = factory()
|
||||
impl = self.get_impl(key)
|
||||
assert _is_collection_attribute_impl(impl)
|
||||
adapter = collections.CollectionAdapter(impl, state, user_data)
|
||||
return adapter, user_data
|
||||
|
||||
def is_instrumented(self, key: str, search: bool = False) -> bool:
|
||||
if search:
|
||||
return key in self
|
||||
else:
|
||||
return key in self.local_attrs
|
||||
|
||||
def get_impl(self, key: str) -> AttributeImpl:
|
||||
return self[key].impl
|
||||
|
||||
@property
|
||||
def attributes(self) -> Iterable[Any]:
|
||||
return iter(self.values())
|
||||
|
||||
# InstanceState management
|
||||
|
||||
def new_instance(self, state: Optional[InstanceState[_O]] = None) -> _O:
|
||||
# here, we would prefer _O to be bound to "object"
|
||||
# so that mypy sees that __new__ is present. currently
|
||||
# it's bound to Any as there were other problems not having
|
||||
# it that way but these can be revisited
|
||||
instance = self.class_.__new__(self.class_)
|
||||
if state is None:
|
||||
state = self._state_constructor(instance, self)
|
||||
self._state_setter(instance, state)
|
||||
return instance
|
||||
|
||||
def setup_instance(
|
||||
self, instance: _O, state: Optional[InstanceState[_O]] = None
|
||||
) -> None:
|
||||
if state is None:
|
||||
state = self._state_constructor(instance, self)
|
||||
self._state_setter(instance, state)
|
||||
|
||||
def teardown_instance(self, instance: _O) -> None:
|
||||
delattr(instance, self.STATE_ATTR)
|
||||
|
||||
def _serialize(
|
||||
self, state: InstanceState[_O], state_dict: Dict[str, Any]
|
||||
) -> _SerializeManager:
|
||||
return _SerializeManager(state, state_dict)
|
||||
|
||||
def _new_state_if_none(
|
||||
self, instance: _O
|
||||
) -> Union[Literal[False], InstanceState[_O]]:
|
||||
"""Install a default InstanceState if none is present.
|
||||
|
||||
A private convenience method used by the __init__ decorator.
|
||||
|
||||
"""
|
||||
if hasattr(instance, self.STATE_ATTR):
|
||||
return False
|
||||
elif self.class_ is not instance.__class__ and self.is_mapped:
|
||||
# this will create a new ClassManager for the
|
||||
# subclass, without a mapper. This is likely a
|
||||
# user error situation but allow the object
|
||||
# to be constructed, so that it is usable
|
||||
# in a non-ORM context at least.
|
||||
return self._subclass_manager(
|
||||
instance.__class__
|
||||
)._new_state_if_none(instance)
|
||||
else:
|
||||
state = self._state_constructor(instance, self)
|
||||
self._state_setter(instance, state)
|
||||
return state
|
||||
|
||||
def has_state(self, instance: _O) -> bool:
|
||||
return hasattr(instance, self.STATE_ATTR)
|
||||
|
||||
def has_parent(
|
||||
self, state: InstanceState[_O], key: str, optimistic: bool = False
|
||||
) -> bool:
|
||||
"""TODO"""
|
||||
return self.get_impl(key).hasparent(state, optimistic=optimistic)
|
||||
|
||||
def __bool__(self) -> bool:
|
||||
"""All ClassManagers are non-zero regardless of attribute state."""
|
||||
return True
|
||||
|
||||
def __repr__(self) -> str:
|
||||
return "<%s of %r at %x>" % (
|
||||
self.__class__.__name__,
|
||||
self.class_,
|
||||
id(self),
|
||||
)
|
||||
|
||||
|
||||
class _SerializeManager:
|
||||
"""Provide serialization of a :class:`.ClassManager`.
|
||||
|
||||
The :class:`.InstanceState` uses ``__init__()`` on serialize
|
||||
and ``__call__()`` on deserialize.
|
||||
|
||||
"""
|
||||
|
||||
def __init__(self, state: state.InstanceState[Any], d: Dict[str, Any]):
|
||||
self.class_ = state.class_
|
||||
manager = state.manager
|
||||
manager.dispatch.pickle(state, d)
|
||||
|
||||
def __call__(self, state, inst, state_dict):
|
||||
state.manager = manager = opt_manager_of_class(self.class_)
|
||||
if manager is None:
|
||||
raise exc.UnmappedInstanceError(
|
||||
inst,
|
||||
"Cannot deserialize object of type %r - "
|
||||
"no mapper() has "
|
||||
"been configured for this class within the current "
|
||||
"Python process!" % self.class_,
|
||||
)
|
||||
elif manager.is_mapped and not manager.mapper.configured:
|
||||
manager.mapper._check_configure()
|
||||
|
||||
# setup _sa_instance_state ahead of time so that
|
||||
# unpickle events can access the object normally.
|
||||
# see [ticket:2362]
|
||||
if inst is not None:
|
||||
manager.setup_instance(inst, state)
|
||||
manager.dispatch.unpickle(state, state_dict)
|
||||
|
||||
|
||||
class InstrumentationFactory(EventTarget):
|
||||
"""Factory for new ClassManager instances."""
|
||||
|
||||
dispatch: dispatcher[InstrumentationFactory]
|
||||
|
||||
def create_manager_for_cls(self, class_: Type[_O]) -> ClassManager[_O]:
|
||||
assert class_ is not None
|
||||
assert opt_manager_of_class(class_) is None
|
||||
|
||||
# give a more complicated subclass
|
||||
# a chance to do what it wants here
|
||||
manager, factory = self._locate_extended_factory(class_)
|
||||
|
||||
if factory is None:
|
||||
factory = ClassManager
|
||||
manager = ClassManager(class_)
|
||||
else:
|
||||
assert manager is not None
|
||||
|
||||
self._check_conflicts(class_, factory)
|
||||
|
||||
manager.factory = factory
|
||||
|
||||
return manager
|
||||
|
||||
def _locate_extended_factory(
|
||||
self, class_: Type[_O]
|
||||
) -> Tuple[Optional[ClassManager[_O]], Optional[_ManagerFactory]]:
|
||||
"""Overridden by a subclass to do an extended lookup."""
|
||||
return None, None
|
||||
|
||||
def _check_conflicts(
|
||||
self, class_: Type[_O], factory: Callable[[Type[_O]], ClassManager[_O]]
|
||||
) -> None:
|
||||
"""Overridden by a subclass to test for conflicting factories."""
|
||||
|
||||
def unregister(self, class_: Type[_O]) -> None:
|
||||
manager = manager_of_class(class_)
|
||||
manager.unregister()
|
||||
self.dispatch.class_uninstrument(class_)
|
||||
|
||||
|
||||
# this attribute is replaced by sqlalchemy.ext.instrumentation
|
||||
# when imported.
|
||||
_instrumentation_factory = InstrumentationFactory()
|
||||
|
||||
# these attributes are replaced by sqlalchemy.ext.instrumentation
|
||||
# when a non-standard InstrumentationManager class is first
|
||||
# used to instrument a class.
|
||||
instance_state = _default_state_getter = base.instance_state
|
||||
|
||||
instance_dict = _default_dict_getter = base.instance_dict
|
||||
|
||||
manager_of_class = _default_manager_getter = base.manager_of_class
|
||||
opt_manager_of_class = _default_opt_manager_getter = base.opt_manager_of_class
|
||||
|
||||
|
||||
def register_class(
|
||||
class_: Type[_O],
|
||||
finalize: bool = True,
|
||||
mapper: Optional[Mapper[_O]] = None,
|
||||
registry: Optional[_RegistryType] = None,
|
||||
declarative_scan: Optional[_MapperConfig] = None,
|
||||
expired_attribute_loader: Optional[_ExpiredAttributeLoaderProto] = None,
|
||||
init_method: Optional[Callable[..., None]] = None,
|
||||
) -> ClassManager[_O]:
|
||||
"""Register class instrumentation.
|
||||
|
||||
Returns the existing or newly created class manager.
|
||||
|
||||
"""
|
||||
|
||||
manager = opt_manager_of_class(class_)
|
||||
if manager is None:
|
||||
manager = _instrumentation_factory.create_manager_for_cls(class_)
|
||||
manager._update_state(
|
||||
mapper=mapper,
|
||||
registry=registry,
|
||||
declarative_scan=declarative_scan,
|
||||
expired_attribute_loader=expired_attribute_loader,
|
||||
init_method=init_method,
|
||||
finalize=finalize,
|
||||
)
|
||||
|
||||
return manager
|
||||
|
||||
|
||||
def unregister_class(class_):
|
||||
"""Unregister class instrumentation."""
|
||||
|
||||
_instrumentation_factory.unregister(class_)
|
||||
|
||||
|
||||
def is_instrumented(instance, key):
|
||||
"""Return True if the given attribute on the given instance is
|
||||
instrumented by the attributes package.
|
||||
|
||||
This function may be used regardless of instrumentation
|
||||
applied directly to the class, i.e. no descriptors are required.
|
||||
|
||||
"""
|
||||
return manager_of_class(instance.__class__).is_instrumented(
|
||||
key, search=True
|
||||
)
|
||||
|
||||
|
||||
def _generate_init(class_, class_manager, original_init):
|
||||
"""Build an __init__ decorator that triggers ClassManager events."""
|
||||
|
||||
# TODO: we should use the ClassManager's notion of the
|
||||
# original '__init__' method, once ClassManager is fixed
|
||||
# to always reference that.
|
||||
|
||||
if original_init is None:
|
||||
original_init = class_.__init__
|
||||
|
||||
# Go through some effort here and don't change the user's __init__
|
||||
# calling signature, including the unlikely case that it has
|
||||
# a return value.
|
||||
# FIXME: need to juggle local names to avoid constructor argument
|
||||
# clashes.
|
||||
func_body = """\
|
||||
def __init__(%(apply_pos)s):
|
||||
new_state = class_manager._new_state_if_none(%(self_arg)s)
|
||||
if new_state:
|
||||
return new_state._initialize_instance(%(apply_kw)s)
|
||||
else:
|
||||
return original_init(%(apply_kw)s)
|
||||
"""
|
||||
func_vars = util.format_argspec_init(original_init, grouped=False)
|
||||
func_text = func_body % func_vars
|
||||
|
||||
func_defaults = getattr(original_init, "__defaults__", None)
|
||||
func_kw_defaults = getattr(original_init, "__kwdefaults__", None)
|
||||
|
||||
env = locals().copy()
|
||||
env["__name__"] = __name__
|
||||
exec(func_text, env)
|
||||
__init__ = env["__init__"]
|
||||
__init__.__doc__ = original_init.__doc__
|
||||
__init__._sa_original_init = original_init
|
||||
|
||||
if func_defaults:
|
||||
__init__.__defaults__ = func_defaults
|
||||
if func_kw_defaults:
|
||||
__init__.__kwdefaults__ = func_kw_defaults
|
||||
|
||||
return __init__
|
||||
1496
venv/Lib/site-packages/sqlalchemy/orm/interfaces.py
Normal file
1496
venv/Lib/site-packages/sqlalchemy/orm/interfaces.py
Normal file
File diff suppressed because it is too large
Load Diff
Reference in New Issue
Block a user