Fix class access of deprecated computed fields (#10391)

Author: Viicos

pydantic/_internal/_model_construction.py

@@ -690,7 +690,7 @@ def set_deprecated_descriptors(cls: type[BaseModel]) -> None:
 
 
 class _DeprecatedFieldDescriptor:
-    """Data descriptor used to emit a runtime deprecation warning before accessing a deprecated field.
+    """Read-only data descriptor used to emit a runtime deprecation warning before accessing a deprecated field.
 
     Attributes:
         msg: The deprecation message to be emitted.
@@ -709,6 +709,8 @@ def __set_name__(self, cls: type[BaseModel], name: str) -> None:
 
     def __get__(self, obj: BaseModel | None, obj_type: type[BaseModel] | None = None) -> Any:
         if obj is None:
+            if self.wrapped_property is not None:
+                return self.wrapped_property.__get__(None, obj_type)
             raise AttributeError(self.field_name)
 
         warnings.warn(self.msg, builtins.DeprecationWarning, stacklevel=2)
@@ -717,7 +719,7 @@ def __get__(self, obj: BaseModel | None, obj_type: type[BaseModel] | None = None
             return self.wrapped_property.__get__(obj, obj_type)
         return obj.__dict__[self.field_name]
 
-    # Defined to take precedence over the instance's dictionary
+    # Defined to make it a data descriptor and take precedence over the instance's dictionary.
     # Note that it will not be called when setting a value on a model instance
     # as `BaseModel.__setattr__` is defined and takes priority.
     def __set__(self, obj: Any, value: Any) -> NoReturn:

tests/test_deprecated_fields.py

@@ -229,3 +229,24 @@ class Model(BaseModel):
     instance = Model(a=1, b=1)
 
     pytest.warns(DeprecationWarning, lambda: instance.a, match='deprecated')
+
+
+def test_computed_field_deprecated_class_access() -> None:
+    class Model(BaseModel):
+        @computed_field(deprecated=True)
+        def prop(self) -> int:
+            return 1
+
+    assert isinstance(Model.prop, property)
+
+
+def test_computed_field_deprecated_subclass() -> None:
+    """https://github.com/pydantic/pydantic/issues/10384"""
+
+    class Base(BaseModel):
+        @computed_field(deprecated=True)
+        def prop(self) -> int:
+            return 1
+
+    class Sub(Base):
+        pass