Загрузить файлы в «venv/Lib/site-packages/sqlalchemy/ext/mypy»

venv/Lib/site-packages/sqlalchemy/ext/mypy/__init__.py

@@ -0,0 +1,6 @@
+# ext/mypy/__init__.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

venv/Lib/site-packages/sqlalchemy/ext/mypy/apply.py

@@ -0,0 +1,324 @@
+# ext/mypy/apply.py
+# Copyright (C) 2021-2026 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
+
+from __future__ import annotations
+
+from typing import List
+from typing import Optional
+from typing import Union
+
+from mypy.nodes import ARG_NAMED_OPT
+from mypy.nodes import Argument
+from mypy.nodes import AssignmentStmt
+from mypy.nodes import CallExpr
+from mypy.nodes import ClassDef
+from mypy.nodes import MDEF
+from mypy.nodes import MemberExpr
+from mypy.nodes import NameExpr
+from mypy.nodes import RefExpr
+from mypy.nodes import StrExpr
+from mypy.nodes import SymbolTableNode
+from mypy.nodes import TempNode
+from mypy.nodes import TypeInfo
+from mypy.nodes import Var
+from mypy.plugin import SemanticAnalyzerPluginInterface
+from mypy.plugins.common import add_method_to_class
+from mypy.types import AnyType
+from mypy.types import get_proper_type
+from mypy.types import Instance
+from mypy.types import NoneTyp
+from mypy.types import ProperType
+from mypy.types import TypeOfAny
+from mypy.types import UnboundType
+from mypy.types import UnionType
+
+from . import infer
+from . import util
+from .names import expr_to_mapped_constructor
+from .names import NAMED_TYPE_SQLA_MAPPED
+
+
+def apply_mypy_mapped_attr(
+    cls: ClassDef,
+    api: SemanticAnalyzerPluginInterface,
+    item: Union[NameExpr, StrExpr],
+    attributes: List[util.SQLAlchemyAttribute],
+) -> None:
+    if isinstance(item, NameExpr):
+        name = item.name
+    elif isinstance(item, StrExpr):
+        name = item.value
+    else:
+        return None
+
+    for stmt in cls.defs.body:
+        if (
+            isinstance(stmt, AssignmentStmt)
+            and isinstance(stmt.lvalues[0], NameExpr)
+            and stmt.lvalues[0].name == name
+        ):
+            break
+    else:
+        util.fail(api, f"Can't find mapped attribute {name}", cls)
+        return None
+
+    if stmt.type is None:
+        util.fail(
+            api,
+            "Statement linked from _mypy_mapped_attrs has no "
+            "typing information",
+            stmt,
+        )
+        return None
+
+    left_hand_explicit_type = get_proper_type(stmt.type)
+    assert isinstance(
+        left_hand_explicit_type, (Instance, UnionType, UnboundType)
+    )
+
+    attributes.append(
+        util.SQLAlchemyAttribute(
+            name=name,
+            line=item.line,
+            column=item.column,
+            typ=left_hand_explicit_type,
+            info=cls.info,
+        )
+    )
+
+    apply_type_to_mapped_statement(
+        api, stmt, stmt.lvalues[0], left_hand_explicit_type, None
+    )
+
+
+def re_apply_declarative_assignments(
+    cls: ClassDef,
+    api: SemanticAnalyzerPluginInterface,
+    attributes: List[util.SQLAlchemyAttribute],
+) -> None:
+    """For multiple class passes, re-apply our left-hand side types as mypy
+    seems to reset them in place.
+
+    """
+    mapped_attr_lookup = {attr.name: attr for attr in attributes}
+    update_cls_metadata = False
+
+    for stmt in cls.defs.body:
+        # for a re-apply, all of our statements are AssignmentStmt;
+        # @declared_attr calls will have been converted and this
+        # currently seems to be preserved by mypy (but who knows if this
+        # will change).
+        if (
+            isinstance(stmt, AssignmentStmt)
+            and isinstance(stmt.lvalues[0], NameExpr)
+            and stmt.lvalues[0].name in mapped_attr_lookup
+            and isinstance(stmt.lvalues[0].node, Var)
+        ):
+            left_node = stmt.lvalues[0].node
+
+            python_type_for_type = mapped_attr_lookup[
+                stmt.lvalues[0].name
+            ].type
+
+            left_node_proper_type = get_proper_type(left_node.type)
+
+            # if we have scanned an UnboundType and now there's a more
+            # specific type than UnboundType, call the re-scan so we
+            # can get that set up correctly
+            if (
+                isinstance(python_type_for_type, UnboundType)
+                and not isinstance(left_node_proper_type, UnboundType)
+                and (
+                    isinstance(stmt.rvalue, CallExpr)
+                    and isinstance(stmt.rvalue.callee, MemberExpr)
+                    and isinstance(stmt.rvalue.callee.expr, NameExpr)
+                    and stmt.rvalue.callee.expr.node is not None
+                    and stmt.rvalue.callee.expr.node.fullname
+                    == NAMED_TYPE_SQLA_MAPPED
+                    and stmt.rvalue.callee.name == "_empty_constructor"
+                    and isinstance(stmt.rvalue.args[0], CallExpr)
+                    and isinstance(stmt.rvalue.args[0].callee, RefExpr)
+                )
+            ):
+                new_python_type_for_type = (
+                    infer.infer_type_from_right_hand_nameexpr(
+                        api,
+                        stmt,
+                        left_node,
+                        left_node_proper_type,
+                        stmt.rvalue.args[0].callee,
+                    )
+                )
+
+                if new_python_type_for_type is not None and not isinstance(
+                    new_python_type_for_type, UnboundType
+                ):
+                    python_type_for_type = new_python_type_for_type
+
+                    # update the SQLAlchemyAttribute with the better
+                    # information
+                    mapped_attr_lookup[stmt.lvalues[0].name].type = (
+                        python_type_for_type
+                    )
+
+                    update_cls_metadata = True
+
+            if (
+                not isinstance(left_node.type, Instance)
+                or left_node.type.type.fullname != NAMED_TYPE_SQLA_MAPPED
+            ):
+                assert python_type_for_type is not None
+                left_node.type = api.named_type(
+                    NAMED_TYPE_SQLA_MAPPED, [python_type_for_type]
+                )
+
+    if update_cls_metadata:
+        util.set_mapped_attributes(cls.info, attributes)
+
+
+def apply_type_to_mapped_statement(
+    api: SemanticAnalyzerPluginInterface,
+    stmt: AssignmentStmt,
+    lvalue: NameExpr,
+    left_hand_explicit_type: Optional[ProperType],
+    python_type_for_type: Optional[ProperType],
+) -> None:
+    """Apply the Mapped[<type>] annotation and right hand object to a
+    declarative assignment statement.
+
+    This converts a Python declarative class statement such as::
+
+        class User(Base):
+            # ...
+
+            attrname = Column(Integer)
+
+    To one that describes the final Python behavior to Mypy::
+
+    ... format: off
+
+        class User(Base):
+            # ...
+
+            attrname : Mapped[Optional[int]] = <meaningless temp node>
+
+    ... format: on
+
+    """
+    left_node = lvalue.node
+    assert isinstance(left_node, Var)
+
+    # to be completely honest I have no idea what the difference between
+    # left_node.type and stmt.type is, what it means if these are different
+    # vs. the same, why in order to get tests to pass I have to assign
+    # to stmt.type for the second case and not the first.  this is complete
+    # trying every combination until it works stuff.
+
+    if left_hand_explicit_type is not None:
+        lvalue.is_inferred_def = False
+        left_node.type = api.named_type(
+            NAMED_TYPE_SQLA_MAPPED, [left_hand_explicit_type]
+        )
+    else:
+        lvalue.is_inferred_def = False
+        left_node.type = api.named_type(
+            NAMED_TYPE_SQLA_MAPPED,
+            (
+                [AnyType(TypeOfAny.special_form)]
+                if python_type_for_type is None
+                else [python_type_for_type]
+            ),
+        )
+
+    # so to have it skip the right side totally, we can do this:
+    # stmt.rvalue = TempNode(AnyType(TypeOfAny.special_form))
+
+    # however, if we instead manufacture a new node that uses the old
+    # one, then we can still get type checking for the call itself,
+    # e.g. the Column, relationship() call, etc.
+
+    # rewrite the node as:
+    # <attr> : Mapped[<typ>] =
+    # _sa_Mapped._empty_constructor(<original CallExpr from rvalue>)
+    # the original right-hand side is maintained so it gets type checked
+    # internally
+    stmt.rvalue = expr_to_mapped_constructor(stmt.rvalue)
+
+    if stmt.type is not None and python_type_for_type is not None:
+        stmt.type = python_type_for_type
+
+
+def add_additional_orm_attributes(
+    cls: ClassDef,
+    api: SemanticAnalyzerPluginInterface,
+    attributes: List[util.SQLAlchemyAttribute],
+) -> None:
+    """Apply __init__, __table__ and other attributes to the mapped class."""
+
+    info = util.info_for_cls(cls, api)
+
+    if info is None:
+        return
+
+    is_base = util.get_is_base(info)
+
+    if "__init__" not in info.names and not is_base:
+        mapped_attr_names = {attr.name: attr.type for attr in attributes}
+
+        for base in info.mro[1:-1]:
+            if "sqlalchemy" not in info.metadata:
+                continue
+
+            base_cls_attributes = util.get_mapped_attributes(base, api)
+            if base_cls_attributes is None:
+                continue
+
+            for attr in base_cls_attributes:
+                mapped_attr_names.setdefault(attr.name, attr.type)
+
+        arguments = []
+        for name, typ in mapped_attr_names.items():
+            if typ is None:
+                typ = AnyType(TypeOfAny.special_form)
+            arguments.append(
+                Argument(
+                    variable=Var(name, typ),
+                    type_annotation=typ,
+                    initializer=TempNode(typ),
+                    kind=ARG_NAMED_OPT,
+                )
+            )
+
+        add_method_to_class(api, cls, "__init__", arguments, NoneTyp())
+
+    if "__table__" not in info.names and util.get_has_table(info):
+        _apply_placeholder_attr_to_class(
+            api, cls, "sqlalchemy.sql.schema.Table", "__table__"
+        )
+    if not is_base:
+        _apply_placeholder_attr_to_class(
+            api, cls, "sqlalchemy.orm.mapper.Mapper", "__mapper__"
+        )
+
+
+def _apply_placeholder_attr_to_class(
+    api: SemanticAnalyzerPluginInterface,
+    cls: ClassDef,
+    qualified_name: str,
+    attrname: str,
+) -> None:
+    sym = api.lookup_fully_qualified_or_none(qualified_name)
+    if sym:
+        assert isinstance(sym.node, TypeInfo)
+        type_: ProperType = Instance(sym.node, [])
+    else:
+        type_ = AnyType(TypeOfAny.special_form)
+    var = Var(attrname)
+    var._fullname = cls.fullname + "." + attrname
+    var.info = cls.info
+    var.type = type_
+    cls.info.names[attrname] = SymbolTableNode(MDEF, var)

venv/Lib/site-packages/sqlalchemy/ext/mypy/decl_class.py

@@ -0,0 +1,515 @@
+# ext/mypy/decl_class.py
+# Copyright (C) 2021-2026 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
+
+from __future__ import annotations
+
+from typing import List
+from typing import Optional
+from typing import Union
+
+from mypy.nodes import AssignmentStmt
+from mypy.nodes import CallExpr
+from mypy.nodes import ClassDef
+from mypy.nodes import Decorator
+from mypy.nodes import LambdaExpr
+from mypy.nodes import ListExpr
+from mypy.nodes import MemberExpr
+from mypy.nodes import NameExpr
+from mypy.nodes import PlaceholderNode
+from mypy.nodes import RefExpr
+from mypy.nodes import StrExpr
+from mypy.nodes import SymbolNode
+from mypy.nodes import SymbolTableNode
+from mypy.nodes import TempNode
+from mypy.nodes import TypeInfo
+from mypy.nodes import Var
+from mypy.plugin import SemanticAnalyzerPluginInterface
+from mypy.types import AnyType
+from mypy.types import CallableType
+from mypy.types import get_proper_type
+from mypy.types import Instance
+from mypy.types import NoneType
+from mypy.types import ProperType
+from mypy.types import Type
+from mypy.types import TypeOfAny
+from mypy.types import UnboundType
+from mypy.types import UnionType
+
+from . import apply
+from . import infer
+from . import names
+from . import util
+
+
+def scan_declarative_assignments_and_apply_types(
+    cls: ClassDef,
+    api: SemanticAnalyzerPluginInterface,
+    is_mixin_scan: bool = False,
+) -> Optional[List[util.SQLAlchemyAttribute]]:
+    info = util.info_for_cls(cls, api)
+
+    if info is None:
+        # this can occur during cached passes
+        return None
+    elif cls.fullname.startswith("builtins"):
+        return None
+
+    mapped_attributes: Optional[List[util.SQLAlchemyAttribute]] = (
+        util.get_mapped_attributes(info, api)
+    )
+
+    # used by assign.add_additional_orm_attributes among others
+    util.establish_as_sqlalchemy(info)
+
+    if mapped_attributes is not None:
+        # ensure that a class that's mapped is always picked up by
+        # its mapped() decorator or declarative metaclass before
+        # it would be detected as an unmapped mixin class
+
+        if not is_mixin_scan:
+            # mypy can call us more than once.  it then *may* have reset the
+            # left hand side of everything, but not the right that we removed,
+            # removing our ability to re-scan.   but we have the types
+            # here, so lets re-apply them, or if we have an UnboundType,
+            # we can re-scan
+
+            apply.re_apply_declarative_assignments(cls, api, mapped_attributes)
+
+        return mapped_attributes
+
+    mapped_attributes = []
+
+    if not cls.defs.body:
+        # when we get a mixin class from another file, the body is
+        # empty (!) but the names are in the symbol table.  so use that.
+
+        for sym_name, sym in info.names.items():
+            _scan_symbol_table_entry(
+                cls, api, sym_name, sym, mapped_attributes
+            )
+    else:
+        for stmt in util.flatten_typechecking(cls.defs.body):
+            if isinstance(stmt, AssignmentStmt):
+                _scan_declarative_assignment_stmt(
+                    cls, api, stmt, mapped_attributes
+                )
+            elif isinstance(stmt, Decorator):
+                _scan_declarative_decorator_stmt(
+                    cls, api, stmt, mapped_attributes
+                )
+    _scan_for_mapped_bases(cls, api)
+
+    if not is_mixin_scan:
+        apply.add_additional_orm_attributes(cls, api, mapped_attributes)
+
+    util.set_mapped_attributes(info, mapped_attributes)
+
+    return mapped_attributes
+
+
+def _scan_symbol_table_entry(
+    cls: ClassDef,
+    api: SemanticAnalyzerPluginInterface,
+    name: str,
+    value: SymbolTableNode,
+    attributes: List[util.SQLAlchemyAttribute],
+) -> None:
+    """Extract mapping information from a SymbolTableNode that's in the
+    type.names dictionary.
+
+    """
+    value_type = get_proper_type(value.type)
+    if not isinstance(value_type, Instance):
+        return
+
+    left_hand_explicit_type = None
+    type_id = names.type_id_for_named_node(value_type.type)
+    # type_id = names._type_id_for_unbound_type(value.type.type, cls, api)
+
+    err = False
+
+    # TODO: this is nearly the same logic as that of
+    # _scan_declarative_decorator_stmt, likely can be merged
+    if type_id in {
+        names.MAPPED,
+        names.RELATIONSHIP,
+        names.COMPOSITE_PROPERTY,
+        names.MAPPER_PROPERTY,
+        names.SYNONYM_PROPERTY,
+        names.COLUMN_PROPERTY,
+    }:
+        if value_type.args:
+            left_hand_explicit_type = get_proper_type(value_type.args[0])
+        else:
+            err = True
+    elif type_id is names.COLUMN:
+        if not value_type.args:
+            err = True
+        else:
+            typeengine_arg: Union[ProperType, TypeInfo] = get_proper_type(
+                value_type.args[0]
+            )
+            if isinstance(typeengine_arg, Instance):
+                typeengine_arg = typeengine_arg.type
+
+            if isinstance(typeengine_arg, (UnboundType, TypeInfo)):
+                sym = api.lookup_qualified(typeengine_arg.name, typeengine_arg)
+                if sym is not None and isinstance(sym.node, TypeInfo):
+                    if names.has_base_type_id(sym.node, names.TYPEENGINE):
+                        left_hand_explicit_type = UnionType(
+                            [
+                                infer.extract_python_type_from_typeengine(
+                                    api, sym.node, []
+                                ),
+                                NoneType(),
+                            ]
+                        )
+                    else:
+                        util.fail(
+                            api,
+                            "Column type should be a TypeEngine "
+                            "subclass not '{}'".format(sym.node.fullname),
+                            value_type,
+                        )
+
+    if err:
+        msg = (
+            "Can't infer type from attribute {} on class {}. "
+            "please specify a return type from this function that is "
+            "one of: Mapped[<python type>], relationship[<target class>], "
+            "Column[<TypeEngine>], MapperProperty[<python type>]"
+        )
+        util.fail(api, msg.format(name, cls.name), cls)
+
+        left_hand_explicit_type = AnyType(TypeOfAny.special_form)
+
+    if left_hand_explicit_type is not None:
+        assert value.node is not None
+        attributes.append(
+            util.SQLAlchemyAttribute(
+                name=name,
+                line=value.node.line,
+                column=value.node.column,
+                typ=left_hand_explicit_type,
+                info=cls.info,
+            )
+        )
+
+
+def _scan_declarative_decorator_stmt(
+    cls: ClassDef,
+    api: SemanticAnalyzerPluginInterface,
+    stmt: Decorator,
+    attributes: List[util.SQLAlchemyAttribute],
+) -> None:
+    """Extract mapping information from a @declared_attr in a declarative
+    class.
+
+    E.g.::
+
+        @reg.mapped
+        class MyClass:
+            # ...
+
+            @declared_attr
+            def updated_at(cls) -> Column[DateTime]:
+                return Column(DateTime)
+
+    Will resolve in mypy as::
+
+        @reg.mapped
+        class MyClass:
+            # ...
+
+            updated_at: Mapped[Optional[datetime.datetime]]
+
+    """
+    for dec in stmt.decorators:
+        if (
+            isinstance(dec, (NameExpr, MemberExpr, SymbolNode))
+            and names.type_id_for_named_node(dec) is names.DECLARED_ATTR
+        ):
+            break
+    else:
+        return
+
+    dec_index = cls.defs.body.index(stmt)
+
+    left_hand_explicit_type: Optional[ProperType] = None
+
+    if util.name_is_dunder(stmt.name):
+        # for dunder names like __table_args__, __tablename__,
+        # __mapper_args__ etc., rewrite these as simple assignment
+        # statements; otherwise mypy doesn't like if the decorated
+        # function has an annotation like ``cls: Type[Foo]`` because
+        # it isn't @classmethod
+        any_ = AnyType(TypeOfAny.special_form)
+        left_node = NameExpr(stmt.var.name)
+        left_node.node = stmt.var
+        new_stmt = AssignmentStmt([left_node], TempNode(any_))
+        new_stmt.type = left_node.node.type
+        cls.defs.body[dec_index] = new_stmt
+        return
+    elif isinstance(stmt.func.type, CallableType):
+        func_type = stmt.func.type.ret_type
+        if isinstance(func_type, UnboundType):
+            type_id = names.type_id_for_unbound_type(func_type, cls, api)
+        else:
+            # this does not seem to occur unless the type argument is
+            # incorrect
+            return
+
+        if (
+            type_id
+            in {
+                names.MAPPED,
+                names.RELATIONSHIP,
+                names.COMPOSITE_PROPERTY,
+                names.MAPPER_PROPERTY,
+                names.SYNONYM_PROPERTY,
+                names.COLUMN_PROPERTY,
+            }
+            and func_type.args
+        ):
+            left_hand_explicit_type = get_proper_type(func_type.args[0])
+        elif type_id is names.COLUMN and func_type.args:
+            typeengine_arg = func_type.args[0]
+            if isinstance(typeengine_arg, UnboundType):
+                sym = api.lookup_qualified(typeengine_arg.name, typeengine_arg)
+                if sym is not None and isinstance(sym.node, TypeInfo):
+                    if names.has_base_type_id(sym.node, names.TYPEENGINE):
+                        left_hand_explicit_type = UnionType(
+                            [
+                                infer.extract_python_type_from_typeengine(
+                                    api, sym.node, []
+                                ),
+                                NoneType(),
+                            ]
+                        )
+                    else:
+                        util.fail(
+                            api,
+                            "Column type should be a TypeEngine "
+                            "subclass not '{}'".format(sym.node.fullname),
+                            func_type,
+                        )
+
+    if left_hand_explicit_type is None:
+        # no type on the decorated function.  our option here is to
+        # dig into the function body and get the return type, but they
+        # should just have an annotation.
+        msg = (
+            "Can't infer type from @declared_attr on function '{}';  "
+            "please specify a return type from this function that is "
+            "one of: Mapped[<python type>], relationship[<target class>], "
+            "Column[<TypeEngine>], MapperProperty[<python type>]"
+        )
+        util.fail(api, msg.format(stmt.var.name), stmt)
+
+        left_hand_explicit_type = AnyType(TypeOfAny.special_form)
+
+    left_node = NameExpr(stmt.var.name)
+    left_node.node = stmt.var
+
+    # totally feeling around in the dark here as I don't totally understand
+    # the significance of UnboundType.  It seems to be something that is
+    # not going to do what's expected when it is applied as the type of
+    # an AssignmentStatement.  So do a feeling-around-in-the-dark version
+    # of converting it to the regular Instance/TypeInfo/UnionType structures
+    # we see everywhere else.
+    if isinstance(left_hand_explicit_type, UnboundType):
+        left_hand_explicit_type = get_proper_type(
+            util.unbound_to_instance(api, left_hand_explicit_type)
+        )
+
+    left_node.node.type = api.named_type(
+        names.NAMED_TYPE_SQLA_MAPPED, [left_hand_explicit_type]
+    )
+
+    # this will ignore the rvalue entirely
+    # rvalue = TempNode(AnyType(TypeOfAny.special_form))
+
+    # rewrite the node as:
+    # <attr> : Mapped[<typ>] =
+    # _sa_Mapped._empty_constructor(lambda: <function body>)
+    # the function body is maintained so it gets type checked internally
+    rvalue = names.expr_to_mapped_constructor(
+        LambdaExpr(stmt.func.arguments, stmt.func.body)
+    )
+
+    new_stmt = AssignmentStmt([left_node], rvalue)
+    new_stmt.type = left_node.node.type
+
+    attributes.append(
+        util.SQLAlchemyAttribute(
+            name=left_node.name,
+            line=stmt.line,
+            column=stmt.column,
+            typ=left_hand_explicit_type,
+            info=cls.info,
+        )
+    )
+    cls.defs.body[dec_index] = new_stmt
+
+
+def _scan_declarative_assignment_stmt(
+    cls: ClassDef,
+    api: SemanticAnalyzerPluginInterface,
+    stmt: AssignmentStmt,
+    attributes: List[util.SQLAlchemyAttribute],
+) -> None:
+    """Extract mapping information from an assignment statement in a
+    declarative class.
+
+    """
+    lvalue = stmt.lvalues[0]
+    if not isinstance(lvalue, NameExpr):
+        return
+
+    sym = cls.info.names.get(lvalue.name)
+
+    # this establishes that semantic analysis has taken place, which
+    # means the nodes are populated and we are called from an appropriate
+    # hook.
+    assert sym is not None
+    node = sym.node
+
+    if isinstance(node, PlaceholderNode):
+        return
+
+    assert node is lvalue.node
+    assert isinstance(node, Var)
+
+    if node.name == "__abstract__":
+        if api.parse_bool(stmt.rvalue) is True:
+            util.set_is_base(cls.info)
+        return
+    elif node.name == "__tablename__":
+        util.set_has_table(cls.info)
+    elif node.name.startswith("__"):
+        return
+    elif node.name == "_mypy_mapped_attrs":
+        if not isinstance(stmt.rvalue, ListExpr):
+            util.fail(api, "_mypy_mapped_attrs is expected to be a list", stmt)
+        else:
+            for item in stmt.rvalue.items:
+                if isinstance(item, (NameExpr, StrExpr)):
+                    apply.apply_mypy_mapped_attr(cls, api, item, attributes)
+
+    left_hand_mapped_type: Optional[Type] = None
+    left_hand_explicit_type: Optional[ProperType] = None
+
+    if node.is_inferred or node.type is None:
+        if isinstance(stmt.type, UnboundType):
+            # look for an explicit Mapped[] type annotation on the left
+            # side with nothing on the right
+
+            # print(stmt.type)
+            # Mapped?[Optional?[A?]]
+
+            left_hand_explicit_type = stmt.type
+
+            if stmt.type.name == "Mapped":
+                mapped_sym = api.lookup_qualified("Mapped", cls)
+                if (
+                    mapped_sym is not None
+                    and mapped_sym.node is not None
+                    and names.type_id_for_named_node(mapped_sym.node)
+                    is names.MAPPED
+                ):
+                    left_hand_explicit_type = get_proper_type(
+                        stmt.type.args[0]
+                    )
+                    left_hand_mapped_type = stmt.type
+
+            # TODO: do we need to convert from unbound for this case?
+            # left_hand_explicit_type = util._unbound_to_instance(
+            #     api, left_hand_explicit_type
+            # )
+    else:
+        node_type = get_proper_type(node.type)
+        if (
+            isinstance(node_type, Instance)
+            and names.type_id_for_named_node(node_type.type) is names.MAPPED
+        ):
+            # print(node.type)
+            # sqlalchemy.orm.attributes.Mapped[<python type>]
+            left_hand_explicit_type = get_proper_type(node_type.args[0])
+            left_hand_mapped_type = node_type
+        else:
+            # print(node.type)
+            # <python type>
+            left_hand_explicit_type = node_type
+            left_hand_mapped_type = None
+
+    if isinstance(stmt.rvalue, TempNode) and left_hand_mapped_type is not None:
+        # annotation without assignment and Mapped is present
+        # as type annotation
+        # equivalent to using _infer_type_from_left_hand_type_only.
+
+        python_type_for_type = left_hand_explicit_type
+    elif isinstance(stmt.rvalue, CallExpr) and isinstance(
+        stmt.rvalue.callee, RefExpr
+    ):
+        python_type_for_type = infer.infer_type_from_right_hand_nameexpr(
+            api, stmt, node, left_hand_explicit_type, stmt.rvalue.callee
+        )
+
+        if python_type_for_type is None:
+            return
+
+    else:
+        return
+
+    assert python_type_for_type is not None
+
+    attributes.append(
+        util.SQLAlchemyAttribute(
+            name=node.name,
+            line=stmt.line,
+            column=stmt.column,
+            typ=python_type_for_type,
+            info=cls.info,
+        )
+    )
+
+    apply.apply_type_to_mapped_statement(
+        api,
+        stmt,
+        lvalue,
+        left_hand_explicit_type,
+        python_type_for_type,
+    )
+
+
+def _scan_for_mapped_bases(
+    cls: ClassDef,
+    api: SemanticAnalyzerPluginInterface,
+) -> None:
+    """Given a class, iterate through its superclass hierarchy to find
+    all other classes that are considered as ORM-significant.
+
+    Locates non-mapped mixins and scans them for mapped attributes to be
+    applied to subclasses.
+
+    """
+
+    info = util.info_for_cls(cls, api)
+
+    if info is None:
+        return
+
+    for base_info in info.mro[1:-1]:
+        if base_info.fullname.startswith("builtins"):
+            continue
+
+        # scan each base for mapped attributes.  if they are not already
+        # scanned (but have all their type info), that means they are unmapped
+        # mixins
+        scan_declarative_assignments_and_apply_types(
+            base_info.defn, api, is_mixin_scan=True
+        )

venv/Lib/site-packages/sqlalchemy/ext/mypy/infer.py

@@ -0,0 +1,590 @@
+# ext/mypy/infer.py
+# Copyright (C) 2021-2026 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
+
+from __future__ import annotations
+
+from typing import Optional
+from typing import Sequence
+
+from mypy.maptype import map_instance_to_supertype
+from mypy.nodes import AssignmentStmt
+from mypy.nodes import CallExpr
+from mypy.nodes import Expression
+from mypy.nodes import FuncDef
+from mypy.nodes import LambdaExpr
+from mypy.nodes import MemberExpr
+from mypy.nodes import NameExpr
+from mypy.nodes import RefExpr
+from mypy.nodes import StrExpr
+from mypy.nodes import TypeInfo
+from mypy.nodes import Var
+from mypy.plugin import SemanticAnalyzerPluginInterface
+from mypy.subtypes import is_subtype
+from mypy.types import AnyType
+from mypy.types import CallableType
+from mypy.types import get_proper_type
+from mypy.types import Instance
+from mypy.types import NoneType
+from mypy.types import ProperType
+from mypy.types import TypeOfAny
+from mypy.types import UnionType
+
+from . import names
+from . import util
+
+
+def infer_type_from_right_hand_nameexpr(
+    api: SemanticAnalyzerPluginInterface,
+    stmt: AssignmentStmt,
+    node: Var,
+    left_hand_explicit_type: Optional[ProperType],
+    infer_from_right_side: RefExpr,
+) -> Optional[ProperType]:
+    type_id = names.type_id_for_callee(infer_from_right_side)
+    if type_id is None:
+        return None
+    elif type_id is names.MAPPED:
+        python_type_for_type = _infer_type_from_mapped(
+            api, stmt, node, left_hand_explicit_type, infer_from_right_side
+        )
+    elif type_id is names.COLUMN:
+        python_type_for_type = _infer_type_from_decl_column(
+            api, stmt, node, left_hand_explicit_type
+        )
+    elif type_id is names.RELATIONSHIP:
+        python_type_for_type = _infer_type_from_relationship(
+            api, stmt, node, left_hand_explicit_type
+        )
+    elif type_id is names.COLUMN_PROPERTY:
+        python_type_for_type = _infer_type_from_decl_column_property(
+            api, stmt, node, left_hand_explicit_type
+        )
+    elif type_id is names.SYNONYM_PROPERTY:
+        python_type_for_type = infer_type_from_left_hand_type_only(
+            api, node, left_hand_explicit_type
+        )
+    elif type_id is names.COMPOSITE_PROPERTY:
+        python_type_for_type = _infer_type_from_decl_composite_property(
+            api, stmt, node, left_hand_explicit_type
+        )
+    else:
+        return None
+
+    return python_type_for_type
+
+
+def _infer_type_from_relationship(
+    api: SemanticAnalyzerPluginInterface,
+    stmt: AssignmentStmt,
+    node: Var,
+    left_hand_explicit_type: Optional[ProperType],
+) -> Optional[ProperType]:
+    """Infer the type of mapping from a relationship.
+
+    E.g.::
+
+        @reg.mapped
+        class MyClass:
+            # ...
+
+            addresses = relationship(Address, uselist=True)
+
+            order: Mapped["Order"] = relationship("Order")
+
+    Will resolve in mypy as::
+
+        @reg.mapped
+        class MyClass:
+            # ...
+
+            addresses: Mapped[List[Address]]
+
+            order: Mapped["Order"]
+
+    """
+
+    assert isinstance(stmt.rvalue, CallExpr)
+    target_cls_arg = stmt.rvalue.args[0]
+    python_type_for_type: Optional[ProperType] = None
+
+    if isinstance(target_cls_arg, NameExpr) and isinstance(
+        target_cls_arg.node, TypeInfo
+    ):
+        # type
+        related_object_type = target_cls_arg.node
+        python_type_for_type = Instance(related_object_type, [])
+
+    # other cases not covered - an error message directs the user
+    # to set an explicit type annotation
+    #
+    # node.type == str, it's a string
+    # if isinstance(target_cls_arg, NameExpr) and isinstance(
+    #     target_cls_arg.node, Var
+    # )
+    # points to a type
+    # isinstance(target_cls_arg, NameExpr) and isinstance(
+    #     target_cls_arg.node, TypeAlias
+    # )
+    # string expression
+    # isinstance(target_cls_arg, StrExpr)
+
+    uselist_arg = util.get_callexpr_kwarg(stmt.rvalue, "uselist")
+    collection_cls_arg: Optional[Expression] = util.get_callexpr_kwarg(
+        stmt.rvalue, "collection_class"
+    )
+    type_is_a_collection = False
+
+    # this can be used to determine Optional for a many-to-one
+    # in the same way nullable=False could be used, if we start supporting
+    # that.
+    # innerjoin_arg = util.get_callexpr_kwarg(stmt.rvalue, "innerjoin")
+
+    if (
+        uselist_arg is not None
+        and api.parse_bool(uselist_arg) is True
+        and collection_cls_arg is None
+    ):
+        type_is_a_collection = True
+        if python_type_for_type is not None:
+            python_type_for_type = api.named_type(
+                names.NAMED_TYPE_BUILTINS_LIST, [python_type_for_type]
+            )
+    elif (
+        uselist_arg is None or api.parse_bool(uselist_arg) is True
+    ) and collection_cls_arg is not None:
+        type_is_a_collection = True
+        if isinstance(collection_cls_arg, CallExpr):
+            collection_cls_arg = collection_cls_arg.callee
+
+        if isinstance(collection_cls_arg, NameExpr) and isinstance(
+            collection_cls_arg.node, TypeInfo
+        ):
+            if python_type_for_type is not None:
+                # this can still be overridden by the left hand side
+                # within _infer_Type_from_left_and_inferred_right
+                python_type_for_type = Instance(
+                    collection_cls_arg.node, [python_type_for_type]
+                )
+        elif (
+            isinstance(collection_cls_arg, NameExpr)
+            and isinstance(collection_cls_arg.node, FuncDef)
+            and collection_cls_arg.node.type is not None
+        ):
+            if python_type_for_type is not None:
+                # this can still be overridden by the left hand side
+                # within _infer_Type_from_left_and_inferred_right
+
+                # TODO: handle mypy.types.Overloaded
+                if isinstance(collection_cls_arg.node.type, CallableType):
+                    rt = get_proper_type(collection_cls_arg.node.type.ret_type)
+
+                    if isinstance(rt, CallableType):
+                        callable_ret_type = get_proper_type(rt.ret_type)
+                        if isinstance(callable_ret_type, Instance):
+                            python_type_for_type = Instance(
+                                callable_ret_type.type,
+                                [python_type_for_type],
+                            )
+        else:
+            util.fail(
+                api,
+                "Expected Python collection type for "
+                "collection_class parameter",
+                stmt.rvalue,
+            )
+            python_type_for_type = None
+    elif uselist_arg is not None and api.parse_bool(uselist_arg) is False:
+        if collection_cls_arg is not None:
+            util.fail(
+                api,
+                "Sending uselist=False and collection_class at the same time "
+                "does not make sense",
+                stmt.rvalue,
+            )
+        if python_type_for_type is not None:
+            python_type_for_type = UnionType(
+                [python_type_for_type, NoneType()]
+            )
+
+    else:
+        if left_hand_explicit_type is None:
+            msg = (
+                "Can't infer scalar or collection for ORM mapped expression "
+                "assigned to attribute '{}' if both 'uselist' and "
+                "'collection_class' arguments are absent from the "
+                "relationship(); please specify a "
+                "type annotation on the left hand side."
+            )
+            util.fail(api, msg.format(node.name), node)
+
+    if python_type_for_type is None:
+        return infer_type_from_left_hand_type_only(
+            api, node, left_hand_explicit_type
+        )
+    elif left_hand_explicit_type is not None:
+        if type_is_a_collection:
+            assert isinstance(left_hand_explicit_type, Instance)
+            assert isinstance(python_type_for_type, Instance)
+            return _infer_collection_type_from_left_and_inferred_right(
+                api, node, left_hand_explicit_type, python_type_for_type
+            )
+        else:
+            return _infer_type_from_left_and_inferred_right(
+                api,
+                node,
+                left_hand_explicit_type,
+                python_type_for_type,
+            )
+    else:
+        return python_type_for_type
+
+
+def _infer_type_from_decl_composite_property(
+    api: SemanticAnalyzerPluginInterface,
+    stmt: AssignmentStmt,
+    node: Var,
+    left_hand_explicit_type: Optional[ProperType],
+) -> Optional[ProperType]:
+    """Infer the type of mapping from a Composite."""
+
+    assert isinstance(stmt.rvalue, CallExpr)
+    target_cls_arg = stmt.rvalue.args[0]
+    python_type_for_type = None
+
+    if isinstance(target_cls_arg, NameExpr) and isinstance(
+        target_cls_arg.node, TypeInfo
+    ):
+        related_object_type = target_cls_arg.node
+        python_type_for_type = Instance(related_object_type, [])
+    else:
+        python_type_for_type = None
+
+    if python_type_for_type is None:
+        return infer_type_from_left_hand_type_only(
+            api, node, left_hand_explicit_type
+        )
+    elif left_hand_explicit_type is not None:
+        return _infer_type_from_left_and_inferred_right(
+            api, node, left_hand_explicit_type, python_type_for_type
+        )
+    else:
+        return python_type_for_type
+
+
+def _infer_type_from_mapped(
+    api: SemanticAnalyzerPluginInterface,
+    stmt: AssignmentStmt,
+    node: Var,
+    left_hand_explicit_type: Optional[ProperType],
+    infer_from_right_side: RefExpr,
+) -> Optional[ProperType]:
+    """Infer the type of mapping from a right side expression
+    that returns Mapped.
+
+
+    """
+    assert isinstance(stmt.rvalue, CallExpr)
+
+    # (Pdb) print(stmt.rvalue.callee)
+    # NameExpr(query_expression [sqlalchemy.orm._orm_constructors.query_expression])  # noqa: E501
+    # (Pdb) stmt.rvalue.callee.node
+    # <mypy.nodes.FuncDef object at 0x7f8d92fb5940>
+    # (Pdb) stmt.rvalue.callee.node.type
+    # def [_T] (default_expr: sqlalchemy.sql.elements.ColumnElement[_T`-1] =) -> sqlalchemy.orm.base.Mapped[_T`-1]  # noqa: E501
+    # sqlalchemy.orm.base.Mapped[_T`-1]
+    # the_mapped_type = stmt.rvalue.callee.node.type.ret_type
+
+    # TODO: look at generic ref and either use that,
+    # or reconcile w/ what's present, etc.
+    the_mapped_type = util.type_for_callee(infer_from_right_side)  # noqa
+
+    return infer_type_from_left_hand_type_only(
+        api, node, left_hand_explicit_type
+    )
+
+
+def _infer_type_from_decl_column_property(
+    api: SemanticAnalyzerPluginInterface,
+    stmt: AssignmentStmt,
+    node: Var,
+    left_hand_explicit_type: Optional[ProperType],
+) -> Optional[ProperType]:
+    """Infer the type of mapping from a ColumnProperty.
+
+    This includes mappings against ``column_property()`` as well as the
+    ``deferred()`` function.
+
+    """
+    assert isinstance(stmt.rvalue, CallExpr)
+
+    if stmt.rvalue.args:
+        first_prop_arg = stmt.rvalue.args[0]
+
+        if isinstance(first_prop_arg, CallExpr):
+            type_id = names.type_id_for_callee(first_prop_arg.callee)
+
+            # look for column_property() / deferred() etc with Column as first
+            # argument
+            if type_id is names.COLUMN:
+                return _infer_type_from_decl_column(
+                    api,
+                    stmt,
+                    node,
+                    left_hand_explicit_type,
+                    right_hand_expression=first_prop_arg,
+                )
+
+    if isinstance(stmt.rvalue, CallExpr):
+        type_id = names.type_id_for_callee(stmt.rvalue.callee)
+        # this is probably not strictly necessary as we have to use the left
+        # hand type for query expression in any case.  any other no-arg
+        # column prop objects would go here also
+        if type_id is names.QUERY_EXPRESSION:
+            return _infer_type_from_decl_column(
+                api,
+                stmt,
+                node,
+                left_hand_explicit_type,
+            )
+
+    return infer_type_from_left_hand_type_only(
+        api, node, left_hand_explicit_type
+    )
+
+
+def _infer_type_from_decl_column(
+    api: SemanticAnalyzerPluginInterface,
+    stmt: AssignmentStmt,
+    node: Var,
+    left_hand_explicit_type: Optional[ProperType],
+    right_hand_expression: Optional[CallExpr] = None,
+) -> Optional[ProperType]:
+    """Infer the type of mapping from a Column.
+
+    E.g.::
+
+        @reg.mapped
+        class MyClass:
+            # ...
+
+            a = Column(Integer)
+
+            b = Column("b", String)
+
+            c: Mapped[int] = Column(Integer)
+
+            d: bool = Column(Boolean)
+
+    Will resolve in MyPy as::
+
+        @reg.mapped
+        class MyClass:
+            # ...
+
+            a: Mapped[int]
+
+            b: Mapped[str]
+
+            c: Mapped[int]
+
+            d: Mapped[bool]
+
+    """
+    assert isinstance(node, Var)
+
+    callee = None
+
+    if right_hand_expression is None:
+        if not isinstance(stmt.rvalue, CallExpr):
+            return None
+
+        right_hand_expression = stmt.rvalue
+
+    for column_arg in right_hand_expression.args[0:2]:
+        if isinstance(column_arg, CallExpr):
+            if isinstance(column_arg.callee, RefExpr):
+                # x = Column(String(50))
+                callee = column_arg.callee
+                type_args: Sequence[Expression] = column_arg.args
+                break
+        elif isinstance(column_arg, (NameExpr, MemberExpr)):
+            if isinstance(column_arg.node, TypeInfo):
+                # x = Column(String)
+                callee = column_arg
+                type_args = ()
+                break
+            else:
+                # x = Column(some_name, String), go to next argument
+                continue
+        elif isinstance(column_arg, (StrExpr,)):
+            # x = Column("name", String), go to next argument
+            continue
+        elif isinstance(column_arg, (LambdaExpr,)):
+            # x = Column("name", String, default=lambda: uuid.uuid4())
+            # go to next argument
+            continue
+        else:
+            assert False
+
+    if callee is None:
+        return None
+
+    if isinstance(callee.node, TypeInfo) and names.mro_has_id(
+        callee.node.mro, names.TYPEENGINE
+    ):
+        python_type_for_type = extract_python_type_from_typeengine(
+            api, callee.node, type_args
+        )
+
+        if left_hand_explicit_type is not None:
+            return _infer_type_from_left_and_inferred_right(
+                api, node, left_hand_explicit_type, python_type_for_type
+            )
+
+        else:
+            return UnionType([python_type_for_type, NoneType()])
+    else:
+        # it's not TypeEngine, it's typically implicitly typed
+        # like ForeignKey.  we can't infer from the right side.
+        return infer_type_from_left_hand_type_only(
+            api, node, left_hand_explicit_type
+        )
+
+
+def _infer_type_from_left_and_inferred_right(
+    api: SemanticAnalyzerPluginInterface,
+    node: Var,
+    left_hand_explicit_type: ProperType,
+    python_type_for_type: ProperType,
+    orig_left_hand_type: Optional[ProperType] = None,
+    orig_python_type_for_type: Optional[ProperType] = None,
+) -> Optional[ProperType]:
+    """Validate type when a left hand annotation is present and we also
+    could infer the right hand side::
+
+        attrname: SomeType = Column(SomeDBType)
+
+    """
+
+    if orig_left_hand_type is None:
+        orig_left_hand_type = left_hand_explicit_type
+    if orig_python_type_for_type is None:
+        orig_python_type_for_type = python_type_for_type
+
+    if not is_subtype(left_hand_explicit_type, python_type_for_type):
+        effective_type = api.named_type(
+            names.NAMED_TYPE_SQLA_MAPPED, [orig_python_type_for_type]
+        )
+
+        msg = (
+            "Left hand assignment '{}: {}' not compatible "
+            "with ORM mapped expression of type {}"
+        )
+        util.fail(
+            api,
+            msg.format(
+                node.name,
+                util.format_type(orig_left_hand_type, api.options),
+                util.format_type(effective_type, api.options),
+            ),
+            node,
+        )
+
+    return orig_left_hand_type
+
+
+def _infer_collection_type_from_left_and_inferred_right(
+    api: SemanticAnalyzerPluginInterface,
+    node: Var,
+    left_hand_explicit_type: Instance,
+    python_type_for_type: Instance,
+) -> Optional[ProperType]:
+    orig_left_hand_type = left_hand_explicit_type
+    orig_python_type_for_type = python_type_for_type
+
+    if left_hand_explicit_type.args:
+        left_hand_arg = get_proper_type(left_hand_explicit_type.args[0])
+        python_type_arg = get_proper_type(python_type_for_type.args[0])
+    else:
+        left_hand_arg = left_hand_explicit_type
+        python_type_arg = python_type_for_type
+
+    assert isinstance(left_hand_arg, (Instance, UnionType))
+    assert isinstance(python_type_arg, (Instance, UnionType))
+
+    return _infer_type_from_left_and_inferred_right(
+        api,
+        node,
+        left_hand_arg,
+        python_type_arg,
+        orig_left_hand_type=orig_left_hand_type,
+        orig_python_type_for_type=orig_python_type_for_type,
+    )
+
+
+def infer_type_from_left_hand_type_only(
+    api: SemanticAnalyzerPluginInterface,
+    node: Var,
+    left_hand_explicit_type: Optional[ProperType],
+) -> Optional[ProperType]:
+    """Determine the type based on explicit annotation only.
+
+    if no annotation were present, note that we need one there to know
+    the type.
+
+    """
+    if left_hand_explicit_type is None:
+        msg = (
+            "Can't infer type from ORM mapped expression "
+            "assigned to attribute '{}'; please specify a "
+            "Python type or "
+            "Mapped[<python type>] on the left hand side."
+        )
+        util.fail(api, msg.format(node.name), node)
+
+        return api.named_type(
+            names.NAMED_TYPE_SQLA_MAPPED, [AnyType(TypeOfAny.special_form)]
+        )
+
+    else:
+        # use type from the left hand side
+        return left_hand_explicit_type
+
+
+def extract_python_type_from_typeengine(
+    api: SemanticAnalyzerPluginInterface,
+    node: TypeInfo,
+    type_args: Sequence[Expression],
+) -> ProperType:
+    if node.fullname == "sqlalchemy.sql.sqltypes.Enum" and type_args:
+        first_arg = type_args[0]
+        if isinstance(first_arg, RefExpr) and isinstance(
+            first_arg.node, TypeInfo
+        ):
+            for base_ in first_arg.node.mro:
+                if base_.fullname == "enum.Enum":
+                    return Instance(first_arg.node, [])
+            # TODO: support other pep-435 types here
+        else:
+            return api.named_type(names.NAMED_TYPE_BUILTINS_STR, [])
+
+    assert node.has_base("sqlalchemy.sql.type_api.TypeEngine"), (
+        "could not extract Python type from node: %s" % node
+    )
+
+    type_engine_sym = api.lookup_fully_qualified_or_none(
+        "sqlalchemy.sql.type_api.TypeEngine"
+    )
+
+    assert type_engine_sym is not None and isinstance(
+        type_engine_sym.node, TypeInfo
+    )
+    type_engine = map_instance_to_supertype(
+        Instance(node, []),
+        type_engine_sym.node,
+    )
+    return get_proper_type(type_engine.args[-1])

venv/Lib/site-packages/sqlalchemy/ext/mypy/names.py

@@ -0,0 +1,335 @@
+# ext/mypy/names.py
+# Copyright (C) 2021-2026 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
+
+from __future__ import annotations
+
+from typing import Dict
+from typing import List
+from typing import Optional
+from typing import Set
+from typing import Tuple
+from typing import Union
+
+from mypy.nodes import ARG_POS
+from mypy.nodes import CallExpr
+from mypy.nodes import ClassDef
+from mypy.nodes import Decorator
+from mypy.nodes import Expression
+from mypy.nodes import FuncDef
+from mypy.nodes import MemberExpr
+from mypy.nodes import NameExpr
+from mypy.nodes import OverloadedFuncDef
+from mypy.nodes import SymbolNode
+from mypy.nodes import TypeAlias
+from mypy.nodes import TypeInfo
+from mypy.plugin import SemanticAnalyzerPluginInterface
+from mypy.types import CallableType
+from mypy.types import get_proper_type
+from mypy.types import Instance
+from mypy.types import UnboundType
+
+from ... import util
+
+COLUMN: int = util.symbol("COLUMN")
+RELATIONSHIP: int = util.symbol("RELATIONSHIP")
+REGISTRY: int = util.symbol("REGISTRY")
+COLUMN_PROPERTY: int = util.symbol("COLUMN_PROPERTY")
+TYPEENGINE: int = util.symbol("TYPEENGNE")
+MAPPED: int = util.symbol("MAPPED")
+DECLARATIVE_BASE: int = util.symbol("DECLARATIVE_BASE")
+DECLARATIVE_META: int = util.symbol("DECLARATIVE_META")
+MAPPED_DECORATOR: int = util.symbol("MAPPED_DECORATOR")
+SYNONYM_PROPERTY: int = util.symbol("SYNONYM_PROPERTY")
+COMPOSITE_PROPERTY: int = util.symbol("COMPOSITE_PROPERTY")
+DECLARED_ATTR: int = util.symbol("DECLARED_ATTR")
+MAPPER_PROPERTY: int = util.symbol("MAPPER_PROPERTY")
+AS_DECLARATIVE: int = util.symbol("AS_DECLARATIVE")
+AS_DECLARATIVE_BASE: int = util.symbol("AS_DECLARATIVE_BASE")
+DECLARATIVE_MIXIN: int = util.symbol("DECLARATIVE_MIXIN")
+QUERY_EXPRESSION: int = util.symbol("QUERY_EXPRESSION")
+
+# names that must succeed with mypy.api.named_type
+NAMED_TYPE_BUILTINS_OBJECT = "builtins.object"
+NAMED_TYPE_BUILTINS_STR = "builtins.str"
+NAMED_TYPE_BUILTINS_LIST = "builtins.list"
+NAMED_TYPE_SQLA_MAPPED = "sqlalchemy.orm.base.Mapped"
+
+_RelFullNames = {
+    "sqlalchemy.orm.relationships.Relationship",
+    "sqlalchemy.orm.relationships.RelationshipProperty",
+    "sqlalchemy.orm.relationships._RelationshipDeclared",
+    "sqlalchemy.orm.Relationship",
+    "sqlalchemy.orm.RelationshipProperty",
+}
+
+_lookup: Dict[str, Tuple[int, Set[str]]] = {
+    "Column": (
+        COLUMN,
+        {
+            "sqlalchemy.sql.schema.Column",
+            "sqlalchemy.sql.Column",
+        },
+    ),
+    "Relationship": (RELATIONSHIP, _RelFullNames),
+    "RelationshipProperty": (RELATIONSHIP, _RelFullNames),
+    "_RelationshipDeclared": (RELATIONSHIP, _RelFullNames),
+    "registry": (
+        REGISTRY,
+        {
+            "sqlalchemy.orm.decl_api.registry",
+            "sqlalchemy.orm.registry",
+        },
+    ),
+    "ColumnProperty": (
+        COLUMN_PROPERTY,
+        {
+            "sqlalchemy.orm.properties.MappedSQLExpression",
+            "sqlalchemy.orm.MappedSQLExpression",
+            "sqlalchemy.orm.properties.ColumnProperty",
+            "sqlalchemy.orm.ColumnProperty",
+        },
+    ),
+    "MappedSQLExpression": (
+        COLUMN_PROPERTY,
+        {
+            "sqlalchemy.orm.properties.MappedSQLExpression",
+            "sqlalchemy.orm.MappedSQLExpression",
+            "sqlalchemy.orm.properties.ColumnProperty",
+            "sqlalchemy.orm.ColumnProperty",
+        },
+    ),
+    "Synonym": (
+        SYNONYM_PROPERTY,
+        {
+            "sqlalchemy.orm.descriptor_props.Synonym",
+            "sqlalchemy.orm.Synonym",
+            "sqlalchemy.orm.descriptor_props.SynonymProperty",
+            "sqlalchemy.orm.SynonymProperty",
+        },
+    ),
+    "SynonymProperty": (
+        SYNONYM_PROPERTY,
+        {
+            "sqlalchemy.orm.descriptor_props.Synonym",
+            "sqlalchemy.orm.Synonym",
+            "sqlalchemy.orm.descriptor_props.SynonymProperty",
+            "sqlalchemy.orm.SynonymProperty",
+        },
+    ),
+    "Composite": (
+        COMPOSITE_PROPERTY,
+        {
+            "sqlalchemy.orm.descriptor_props.Composite",
+            "sqlalchemy.orm.Composite",
+            "sqlalchemy.orm.descriptor_props.CompositeProperty",
+            "sqlalchemy.orm.CompositeProperty",
+        },
+    ),
+    "CompositeProperty": (
+        COMPOSITE_PROPERTY,
+        {
+            "sqlalchemy.orm.descriptor_props.Composite",
+            "sqlalchemy.orm.Composite",
+            "sqlalchemy.orm.descriptor_props.CompositeProperty",
+            "sqlalchemy.orm.CompositeProperty",
+        },
+    ),
+    "MapperProperty": (
+        MAPPER_PROPERTY,
+        {
+            "sqlalchemy.orm.interfaces.MapperProperty",
+            "sqlalchemy.orm.MapperProperty",
+        },
+    ),
+    "TypeEngine": (TYPEENGINE, {"sqlalchemy.sql.type_api.TypeEngine"}),
+    "Mapped": (MAPPED, {NAMED_TYPE_SQLA_MAPPED}),
+    "declarative_base": (
+        DECLARATIVE_BASE,
+        {
+            "sqlalchemy.ext.declarative.declarative_base",
+            "sqlalchemy.orm.declarative_base",
+            "sqlalchemy.orm.decl_api.declarative_base",
+        },
+    ),
+    "DeclarativeMeta": (
+        DECLARATIVE_META,
+        {
+            "sqlalchemy.ext.declarative.DeclarativeMeta",
+            "sqlalchemy.orm.DeclarativeMeta",
+            "sqlalchemy.orm.decl_api.DeclarativeMeta",
+        },
+    ),
+    "mapped": (
+        MAPPED_DECORATOR,
+        {
+            "sqlalchemy.orm.decl_api.registry.mapped",
+            "sqlalchemy.orm.registry.mapped",
+        },
+    ),
+    "as_declarative": (
+        AS_DECLARATIVE,
+        {
+            "sqlalchemy.ext.declarative.as_declarative",
+            "sqlalchemy.orm.decl_api.as_declarative",
+            "sqlalchemy.orm.as_declarative",
+        },
+    ),
+    "as_declarative_base": (
+        AS_DECLARATIVE_BASE,
+        {
+            "sqlalchemy.orm.decl_api.registry.as_declarative_base",
+            "sqlalchemy.orm.registry.as_declarative_base",
+        },
+    ),
+    "declared_attr": (
+        DECLARED_ATTR,
+        {
+            "sqlalchemy.orm.decl_api.declared_attr",
+            "sqlalchemy.orm.declared_attr",
+        },
+    ),
+    "declarative_mixin": (
+        DECLARATIVE_MIXIN,
+        {
+            "sqlalchemy.orm.decl_api.declarative_mixin",
+            "sqlalchemy.orm.declarative_mixin",
+        },
+    ),
+    "query_expression": (
+        QUERY_EXPRESSION,
+        {
+            "sqlalchemy.orm.query_expression",
+            "sqlalchemy.orm._orm_constructors.query_expression",
+        },
+    ),
+}
+
+
+def has_base_type_id(info: TypeInfo, type_id: int) -> bool:
+    for mr in info.mro:
+        check_type_id, fullnames = _lookup.get(mr.name, (None, None))
+        if check_type_id == type_id:
+            break
+    else:
+        return False
+
+    if fullnames is None:
+        return False
+
+    return mr.fullname in fullnames
+
+
+def mro_has_id(mro: List[TypeInfo], type_id: int) -> bool:
+    for mr in mro:
+        check_type_id, fullnames = _lookup.get(mr.name, (None, None))
+        if check_type_id == type_id:
+            break
+    else:
+        return False
+
+    if fullnames is None:
+        return False
+
+    return mr.fullname in fullnames
+
+
+def type_id_for_unbound_type(
+    type_: UnboundType, cls: ClassDef, api: SemanticAnalyzerPluginInterface
+) -> Optional[int]:
+    sym = api.lookup_qualified(type_.name, type_)
+    if sym is not None:
+        if isinstance(sym.node, TypeAlias):
+            target_type = get_proper_type(sym.node.target)
+            if isinstance(target_type, Instance):
+                return type_id_for_named_node(target_type.type)
+        elif isinstance(sym.node, TypeInfo):
+            return type_id_for_named_node(sym.node)
+
+    return None
+
+
+def type_id_for_callee(callee: Expression) -> Optional[int]:
+    if isinstance(callee, (MemberExpr, NameExpr)):
+        if isinstance(callee.node, Decorator) and isinstance(
+            callee.node.func, FuncDef
+        ):
+            if callee.node.func.type and isinstance(
+                callee.node.func.type, CallableType
+            ):
+                ret_type = get_proper_type(callee.node.func.type.ret_type)
+
+                if isinstance(ret_type, Instance):
+                    return type_id_for_fullname(ret_type.type.fullname)
+
+            return None
+
+        elif isinstance(callee.node, OverloadedFuncDef):
+            if (
+                callee.node.impl
+                and callee.node.impl.type
+                and isinstance(callee.node.impl.type, CallableType)
+            ):
+                ret_type = get_proper_type(callee.node.impl.type.ret_type)
+
+                if isinstance(ret_type, Instance):
+                    return type_id_for_fullname(ret_type.type.fullname)
+
+            return None
+        elif isinstance(callee.node, FuncDef):
+            if callee.node.type and isinstance(callee.node.type, CallableType):
+                ret_type = get_proper_type(callee.node.type.ret_type)
+
+                if isinstance(ret_type, Instance):
+                    return type_id_for_fullname(ret_type.type.fullname)
+
+            return None
+        elif isinstance(callee.node, TypeAlias):
+            target_type = get_proper_type(callee.node.target)
+            if isinstance(target_type, Instance):
+                return type_id_for_fullname(target_type.type.fullname)
+        elif isinstance(callee.node, TypeInfo):
+            return type_id_for_named_node(callee)
+    return None
+
+
+def type_id_for_named_node(
+    node: Union[NameExpr, MemberExpr, SymbolNode],
+) -> Optional[int]:
+    type_id, fullnames = _lookup.get(node.name, (None, None))
+
+    if type_id is None or fullnames is None:
+        return None
+    elif node.fullname in fullnames:
+        return type_id
+    else:
+        return None
+
+
+def type_id_for_fullname(fullname: str) -> Optional[int]:
+    tokens = fullname.split(".")
+    immediate = tokens[-1]
+
+    type_id, fullnames = _lookup.get(immediate, (None, None))
+
+    if type_id is None or fullnames is None:
+        return None
+    elif fullname in fullnames:
+        return type_id
+    else:
+        return None
+
+
+def expr_to_mapped_constructor(expr: Expression) -> CallExpr:
+    column_descriptor = NameExpr("__sa_Mapped")
+    column_descriptor.fullname = NAMED_TYPE_SQLA_MAPPED
+    member_expr = MemberExpr(column_descriptor, "_empty_constructor")
+    return CallExpr(
+        member_expr,
+        [expr],
+        [ARG_POS],
+        ["arg1"],
+    )