establish column_property and query_expression as readonly from a dc perspective

Fixed bug in ORM Declarative Dataclasses where the
:func:`_orm.queryable_attribute` and :func:`_orm.column_property`
constructs, which are documented as read-only constructs in the context of
a Declarative mapping, could not be used with a
:class:`_orm.MappedAsDataclass` class without adding ``init=False``, which
in the case of :func:`_orm.queryable_attribute` was not possible as no
``init`` parameter was included. These constructs have been modified from a
dataclass perspective to be assumed to be "read only", setting
``init=False`` by default and no longer including them in the pep-681
constructor. The dataclass parameters for :func:`_orm.column_property`
``init``, ``default``, ``default_factory``, ``kw_only`` are now deprecated;
these fields don't apply to :func:`_orm.column_property` as used in a
Declarative dataclasses configuration where the construct would be
read-only. Also added read-specific parameter
:paramref:`_orm.queryable_attribute.compare` to
:func:`_orm.queryable_attribute`; :paramref:`_orm.queryable_attribute.repr`
was already present.

Added missing :paramref:`_orm.mapped_column.active_history` parameter
to :func:`_orm.mapped_column` construct.

Fixes: #9628
Change-Id: I2ab44d6b763b20410bd1ebb5ac949a6d223f1ce2

1 files changed, 15 insertions, 1 deletions

diff --git a/lib/sqlalchemy/ext/mypy/names.py b/lib/sqlalchemy/ext/mypy/names.py
index fac6bf5b1..989f25592 100644
--- a/lib/sqlalchemy/ext/mypy/names.py
+++ b/lib/sqlalchemy/ext/mypy/names.py
@@ -17,6 +17,7 @@ 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
@@ -261,7 +262,20 @@ def type_id_for_unbound_type(
 
 def type_id_for_callee(callee: Expression) -> Optional[int]:
     if isinstance(callee, (MemberExpr, NameExpr)):
-        if isinstance(callee.node, OverloadedFuncDef):
+        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