Add attributes forwarding for the `Dependency` provider

src/dependency_injector/containers.c

@@ -14646,7 +14646,7 @@ static PyObject *__pyx_pf_19dependency_injector_10containers_4override(CYTHON_UN
 
 /* Python wrapper */
 static PyObject *__pyx_pw_19dependency_injector_10containers_7copy(PyObject *__pyx_self, PyObject *__pyx_v_container); /*proto*/
-static char __pyx_doc_19dependency_injector_10containers_6copy[] = ":py:class:`DeclarativeContainer` copying decorator.\n\n    This decorator copy all providers from provided container to decorated one.\n    If one of the decorated container providers matches to source container\n    providers by name, it would be replaced by reference.\n\n    :param container: Container that should be copied by decorated container.\n    :type container: :py:class:`DeclarativeContainer`\n\n    :return: Declarative container's copying decorator.\n    :rtype: callable(:py:class:`DeclarativeContainer`)\n    ";
+static char __pyx_doc_19dependency_injector_10containers_6copy[] = ":py:class:`DeclarativeContainer` copying decorator.\n\n    This decorator copies all providers from provided container to decorated one.\n    If one of the decorated container providers matches to source container\n    providers by name, it would be replaced by reference.\n\n    :param container: Container that should be copied by decorated container.\n    :type container: :py:class:`DeclarativeContainer`\n\n    :return: Declarative container's copying decorator.\n    :rtype: callable(:py:class:`DeclarativeContainer`)\n    ";
 static PyMethodDef __pyx_mdef_19dependency_injector_10containers_7copy = {"copy", (PyCFunction)__pyx_pw_19dependency_injector_10containers_7copy, METH_O, __pyx_doc_19dependency_injector_10containers_6copy};
 static PyObject *__pyx_pw_19dependency_injector_10containers_7copy(PyObject *__pyx_self, PyObject *__pyx_v_container) {
   PyObject *__pyx_r = 0;

src/dependency_injector/providers.pyi

@@ -102,6 +102,7 @@ class Delegate(Provider[Provider]):
 
 class Dependency(Provider[T]):
     def __init__(self, instance_of: Type[T] = object, default: Optional[Union[Provider, Any]] = None) -> None: ...
+    def __getattr__(self, name: str) -> Any: ...
     @property
     def instance_of(self) -> Type[T]: ...
     @property

src/dependency_injector/providers.pyx

@@ -680,6 +680,13 @@ cdef class Dependency(Provider):
                 self._check_instance_type(result)
                 return result
 
+    def __getattr__(self, name):
+        if self.__last_overriding:
+            return getattr(self.__last_overriding, name)
+        elif self.__default is not UNDEFINED:
+            return getattr(self.__default, name)
+        return super().__getattr__(name)
+
     def __str__(self):
         """Return string representation of provider.
 

tests/unit/providers/test_base_py2_py3.py

@@ -496,6 +496,28 @@ class DependencyTests(unittest.TestCase):
         self.assertIsNot(container.name, copied.name)
         self.assertIsNot(container.name.parent, copied.name.parent)
 
+    def test_forward_attr_to_default(self):
+        default = providers.Configuration()
+
+        provider = providers.Dependency(default=default)
+        provider.from_dict({'foo': 'bar'})
+
+        self.assertEqual(default(), {'foo': 'bar'})
+
+    def test_forward_attr_to_overriding(self):
+        overriding = providers.Configuration()
+
+        provider = providers.Dependency()
+        provider.override(overriding)
+        provider.from_dict({'foo': 'bar'})
+
+        self.assertEqual(overriding(), {'foo': 'bar'})
+
+    def test_forward_attr_to_none(self):
+        provider = providers.Dependency()
+        with self.assertRaises(AttributeError):
+            provider.from_dict
+
     def test_deepcopy(self):
         provider = providers.Dependency(int)