ERROR 2025-08-19 11:36:02,836 log Internal Server Error: /swagger/ Traceback (most recent call last): File "/usr/local/lib/python3.13/site-packages/asgiref/sync.py", line 489, in thread_handler raise exc_info[1] File "/usr/local/lib/python3.13/site-packages/django/core/handlers/exception.py", line 42, in inner response = await get_response(request) ^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.13/site-packages/asgiref/sync.py", line 489, in thread_handler raise exc_info[1] File "/usr/local/lib/python3.13/site-packages/django/core/handlers/base.py", line 253, in _get_response_async response = await wrapped_callback( ^^^^^^^^^^^^^^^^^^^^^^^ request, *callback_args, **callback_kwargs ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ) ^ File "/usr/local/lib/python3.13/site-packages/asgiref/sync.py", line 439, in __call__ ret = await asyncio.shield(exec_coro) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.13/concurrent/futures/thread.py", line 59, in run result = self.fn(*self.args, **self.kwargs) File "/usr/local/lib/python3.13/site-packages/asgiref/sync.py", line 493, in thread_handler return func(*args, **kwargs) File "/usr/local/lib/python3.13/site-packages/django/views/decorators/csrf.py", line 65, in _view_wrapper return view_func(request, *args, **kwargs) File "/usr/local/lib/python3.13/site-packages/django/views/generic/base.py", line 105, in view return self.dispatch(request, *args, **kwargs) ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.13/site-packages/rest_framework/views.py", line 515, in dispatch response = self.handle_exception(exc) File "/usr/local/lib/python3.13/site-packages/rest_framework/views.py", line 475, in handle_exception self.raise_uncaught_exception(exc) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^ File "/usr/local/lib/python3.13/site-packages/rest_framework/views.py", line 486, in raise_uncaught_exception raise exc File "/usr/local/lib/python3.13/site-packages/rest_framework/views.py", line 512, in dispatch response = handler(request, *args, **kwargs) File "/usr/local/lib/python3.13/site-packages/drf_yasg/views.py", line 112, in get schema = generator.get_schema(request, self.public) File "/usr/local/lib/python3.13/site-packages/drf_yasg/generators.py", line 276, in get_schema paths, prefix = self.get_paths(endpoints, components, request, public) ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.13/site-packages/drf_yasg/generators.py", line 482, in get_paths operation = self.get_operation(view, path, prefix, method, components, request) File "/usr/local/lib/python3.13/site-packages/drf_yasg/generators.py", line 524, in get_operation operation = view_inspector.get_operation(operation_keys) File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/view.py", line 32, in get_operation body = self.get_request_body_parameters(consumes) File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/view.py", line 85, in get_request_body_parameters schema = self.get_request_body_schema(serializer) File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/view.py", line 142, in get_request_body_schema return self.serializer_to_schema(serializer) ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^ File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/base.py", line 438, in serializer_to_schema return self.probe_inspectors( ~~~~~~~~~~~~~~~~~~~~~^ self.field_inspectors, 'get_schema', serializer, {'field_inspectors': self.field_inspectors} ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ) ^ File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/base.py", line 110, in probe_inspectors result = method(obj, **kwargs) File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/field.py", line 49, in get_schema return self.probe_field_inspectors(serializer, openapi.Schema, self.use_definitions) ~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/base.py", line 228, in probe_field_inspectors return self.probe_inspectors( ~~~~~~~~~~~~~~~~~~~~~^ self.field_inspectors, 'field_to_swagger_object', field, {'field_inspectors': self.field_inspectors}, ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ swagger_object_type=swagger_object_type, use_references=use_references, **kwargs ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ) ^ File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/base.py", line 110, in probe_inspectors result = method(obj, **kwargs) File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/field.py", line 140, in field_to_swagger_object actual_schema = definitions.setdefault(ref_name, make_schema_definition) File "/usr/local/lib/python3.13/site-packages/drf_yasg/openapi.py", line 685, in setdefault ret = maker() File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/field.py", line 109, in make_schema_definition for property_name, child in serializer.fields.items(): ^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.13/site-packages/django/utils/functional.py", line 47, in __get__ res = instance.__dict__[self.name] = self.func(instance) ~~~~~~~~~^^^^^^^^^^ File "/usr/local/lib/python3.13/site-packages/rest_framework/serializers.py", line 374, in fields for key, value in self.get_fields().items(): ~~~~~~~~~~~~~~~^^ File "/usr/local/lib/python3.13/site-packages/rest_framework/serializers.py", line 1081, in get_fields field_names = self.get_field_names(declared_fields, info) File "/usr/local/lib/python3.13/site-packages/rest_framework/serializers.py", line 1177, in get_field_names assert field_name in fields, ( ^^^^^^^^^^^^^^^^^^^^ AssertionError: The field 'product_count' was declared on serializer SubFolderSerializer, but has not been included in the 'fields' option. ERROR 2025-08-19 11:36:14,177 log Internal Server Error: /swagger/ Traceback (most recent call last): File "/usr/local/lib/python3.13/site-packages/asgiref/sync.py", line 489, in thread_handler raise exc_info[1] File "/usr/local/lib/python3.13/site-packages/django/core/handlers/exception.py", line 42, in inner response = await get_response(request) ^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.13/site-packages/asgiref/sync.py", line 489, in thread_handler raise exc_info[1] File "/usr/local/lib/python3.13/site-packages/django/core/handlers/base.py", line 253, in _get_response_async response = await wrapped_callback( ^^^^^^^^^^^^^^^^^^^^^^^ request, *callback_args, **callback_kwargs ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ) ^ File "/usr/local/lib/python3.13/site-packages/asgiref/sync.py", line 439, in __call__ ret = await asyncio.shield(exec_coro) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.13/concurrent/futures/thread.py", line 59, in run result = self.fn(*self.args, **self.kwargs) File "/usr/local/lib/python3.13/site-packages/asgiref/sync.py", line 493, in thread_handler return func(*args, **kwargs) File "/usr/local/lib/python3.13/site-packages/django/views/decorators/csrf.py", line 65, in _view_wrapper return view_func(request, *args, **kwargs) File "/usr/local/lib/python3.13/site-packages/django/views/generic/base.py", line 105, in view return self.dispatch(request, *args, **kwargs) ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.13/site-packages/rest_framework/views.py", line 515, in dispatch response = self.handle_exception(exc) File "/usr/local/lib/python3.13/site-packages/rest_framework/views.py", line 475, in handle_exception self.raise_uncaught_exception(exc) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^ File "/usr/local/lib/python3.13/site-packages/rest_framework/views.py", line 486, in raise_uncaught_exception raise exc File "/usr/local/lib/python3.13/site-packages/rest_framework/views.py", line 512, in dispatch response = handler(request, *args, **kwargs) File "/usr/local/lib/python3.13/site-packages/drf_yasg/views.py", line 112, in get schema = generator.get_schema(request, self.public) File "/usr/local/lib/python3.13/site-packages/drf_yasg/generators.py", line 276, in get_schema paths, prefix = self.get_paths(endpoints, components, request, public) ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.13/site-packages/drf_yasg/generators.py", line 482, in get_paths operation = self.get_operation(view, path, prefix, method, components, request) File "/usr/local/lib/python3.13/site-packages/drf_yasg/generators.py", line 524, in get_operation operation = view_inspector.get_operation(operation_keys) File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/view.py", line 32, in get_operation body = self.get_request_body_parameters(consumes) File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/view.py", line 85, in get_request_body_parameters schema = self.get_request_body_schema(serializer) File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/view.py", line 142, in get_request_body_schema return self.serializer_to_schema(serializer) ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^ File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/base.py", line 438, in serializer_to_schema return self.probe_inspectors( ~~~~~~~~~~~~~~~~~~~~~^ self.field_inspectors, 'get_schema', serializer, {'field_inspectors': self.field_inspectors} ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ) ^ File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/base.py", line 110, in probe_inspectors result = method(obj, **kwargs) File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/field.py", line 49, in get_schema return self.probe_field_inspectors(serializer, openapi.Schema, self.use_definitions) ~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/base.py", line 228, in probe_field_inspectors return self.probe_inspectors( ~~~~~~~~~~~~~~~~~~~~~^ self.field_inspectors, 'field_to_swagger_object', field, {'field_inspectors': self.field_inspectors}, ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ swagger_object_type=swagger_object_type, use_references=use_references, **kwargs ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ) ^ File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/base.py", line 110, in probe_inspectors result = method(obj, **kwargs) File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/field.py", line 140, in field_to_swagger_object actual_schema = definitions.setdefault(ref_name, make_schema_definition) File "/usr/local/lib/python3.13/site-packages/drf_yasg/openapi.py", line 685, in setdefault ret = maker() File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/field.py", line 109, in make_schema_definition for property_name, child in serializer.fields.items(): ^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.13/site-packages/django/utils/functional.py", line 47, in __get__ res = instance.__dict__[self.name] = self.func(instance) ~~~~~~~~~^^^^^^^^^^ File "/usr/local/lib/python3.13/site-packages/rest_framework/serializers.py", line 374, in fields for key, value in self.get_fields().items(): ~~~~~~~~~~~~~~~^^ File "/usr/local/lib/python3.13/site-packages/rest_framework/serializers.py", line 1081, in get_fields field_names = self.get_field_names(declared_fields, info) File "/usr/local/lib/python3.13/site-packages/rest_framework/serializers.py", line 1177, in get_field_names assert field_name in fields, ( ^^^^^^^^^^^^^^^^^^^^ AssertionError: The field 'product_count' was declared on serializer SubFolderSerializer, but has not been included in the 'fields' option. ERROR 2025-08-19 11:37:10,738 log Internal Server Error: /swagger/ Traceback (most recent call last): File "/usr/local/lib/python3.13/site-packages/asgiref/sync.py", line 489, in thread_handler raise exc_info[1] File "/usr/local/lib/python3.13/site-packages/django/core/handlers/exception.py", line 42, in inner response = await get_response(request) ^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.13/site-packages/asgiref/sync.py", line 489, in thread_handler raise exc_info[1] File "/usr/local/lib/python3.13/site-packages/django/core/handlers/base.py", line 253, in _get_response_async response = await wrapped_callback( ^^^^^^^^^^^^^^^^^^^^^^^ request, *callback_args, **callback_kwargs ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ) ^ File "/usr/local/lib/python3.13/site-packages/asgiref/sync.py", line 439, in __call__ ret = await asyncio.shield(exec_coro) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.13/concurrent/futures/thread.py", line 59, in run result = self.fn(*self.args, **self.kwargs) File "/usr/local/lib/python3.13/site-packages/asgiref/sync.py", line 493, in thread_handler return func(*args, **kwargs) File "/usr/local/lib/python3.13/site-packages/django/views/decorators/csrf.py", line 65, in _view_wrapper return view_func(request, *args, **kwargs) File "/usr/local/lib/python3.13/site-packages/django/views/generic/base.py", line 105, in view return self.dispatch(request, *args, **kwargs) ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.13/site-packages/rest_framework/views.py", line 515, in dispatch response = self.handle_exception(exc) File "/usr/local/lib/python3.13/site-packages/rest_framework/views.py", line 475, in handle_exception self.raise_uncaught_exception(exc) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^ File "/usr/local/lib/python3.13/site-packages/rest_framework/views.py", line 486, in raise_uncaught_exception raise exc File "/usr/local/lib/python3.13/site-packages/rest_framework/views.py", line 512, in dispatch response = handler(request, *args, **kwargs) File "/usr/local/lib/python3.13/site-packages/drf_yasg/views.py", line 112, in get schema = generator.get_schema(request, self.public) File "/usr/local/lib/python3.13/site-packages/drf_yasg/generators.py", line 276, in get_schema paths, prefix = self.get_paths(endpoints, components, request, public) ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.13/site-packages/drf_yasg/generators.py", line 482, in get_paths operation = self.get_operation(view, path, prefix, method, components, request) File "/usr/local/lib/python3.13/site-packages/drf_yasg/generators.py", line 524, in get_operation operation = view_inspector.get_operation(operation_keys) File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/view.py", line 32, in get_operation body = self.get_request_body_parameters(consumes) File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/view.py", line 85, in get_request_body_parameters schema = self.get_request_body_schema(serializer) File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/view.py", line 142, in get_request_body_schema return self.serializer_to_schema(serializer) ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^ File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/base.py", line 438, in serializer_to_schema return self.probe_inspectors( ~~~~~~~~~~~~~~~~~~~~~^ self.field_inspectors, 'get_schema', serializer, {'field_inspectors': self.field_inspectors} ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ) ^ File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/base.py", line 110, in probe_inspectors result = method(obj, **kwargs) File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/field.py", line 49, in get_schema return self.probe_field_inspectors(serializer, openapi.Schema, self.use_definitions) ~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/base.py", line 228, in probe_field_inspectors return self.probe_inspectors( ~~~~~~~~~~~~~~~~~~~~~^ self.field_inspectors, 'field_to_swagger_object', field, {'field_inspectors': self.field_inspectors}, ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ swagger_object_type=swagger_object_type, use_references=use_references, **kwargs ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ) ^ File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/base.py", line 110, in probe_inspectors result = method(obj, **kwargs) File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/field.py", line 140, in field_to_swagger_object actual_schema = definitions.setdefault(ref_name, make_schema_definition) File "/usr/local/lib/python3.13/site-packages/drf_yasg/openapi.py", line 685, in setdefault ret = maker() File "/usr/local/lib/python3.13/site-packages/drf_yasg/inspectors/field.py", line 109, in make_schema_definition for property_name, child in serializer.fields.items(): ^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.13/site-packages/django/utils/functional.py", line 47, in __get__ res = instance.__dict__[self.name] = self.func(instance) ~~~~~~~~~^^^^^^^^^^ File "/usr/local/lib/python3.13/site-packages/rest_framework/serializers.py", line 374, in fields for key, value in self.get_fields().items(): ~~~~~~~~~~~~~~~^^ File "/usr/local/lib/python3.13/site-packages/rest_framework/serializers.py", line 1081, in get_fields field_names = self.get_field_names(declared_fields, info) File "/usr/local/lib/python3.13/site-packages/rest_framework/serializers.py", line 1177, in get_field_names assert field_name in fields, ( ^^^^^^^^^^^^^^^^^^^^ AssertionError: The field 'product_count' was declared on serializer SubFolderSerializer, but has not been included in the 'fields' option. ERROR 2025-08-19 11:37:39,397 log Internal Server Error: /api/v1/orders/order/list/ Traceback (most recent call last): File "/usr/local/lib/python3.13/site-packages/asgiref/sync.py", line 489, in thread_handler raise exc_info[1] File "/usr/local/lib/python3.13/site-packages/django/core/handlers/exception.py", line 42, in inner response = await get_response(request) ^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.13/site-packages/asgiref/sync.py", line 489, in thread_handler raise exc_info[1] File "/usr/local/lib/python3.13/site-packages/django/core/handlers/base.py", line 253, in _get_response_async response = await wrapped_callback( ^^^^^^^^^^^^^^^^^^^^^^^ request, *callback_args, **callback_kwargs ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ) ^ File "/usr/local/lib/python3.13/site-packages/asgiref/sync.py", line 439, in __call__ ret = await asyncio.shield(exec_coro) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.13/concurrent/futures/thread.py", line 59, in run result = self.fn(*self.args, **self.kwargs) File "/usr/local/lib/python3.13/site-packages/asgiref/sync.py", line 493, in thread_handler return func(*args, **kwargs) File "/usr/local/lib/python3.13/site-packages/django/views/decorators/csrf.py", line 65, in _view_wrapper return view_func(request, *args, **kwargs) File "/usr/local/lib/python3.13/site-packages/django/views/generic/base.py", line 105, in view return self.dispatch(request, *args, **kwargs) ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.13/site-packages/rest_framework/views.py", line 515, in dispatch response = self.handle_exception(exc) File "/usr/local/lib/python3.13/site-packages/rest_framework/views.py", line 475, in handle_exception self.raise_uncaught_exception(exc) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^ File "/usr/local/lib/python3.13/site-packages/rest_framework/views.py", line 486, in raise_uncaught_exception raise exc File "/usr/local/lib/python3.13/site-packages/rest_framework/views.py", line 512, in dispatch response = handler(request, *args, **kwargs) File "/usr/local/lib/python3.13/site-packages/rest_framework/generics.py", line 203, in get return self.list(request, *args, **kwargs) ~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.13/site-packages/rest_framework/mixins.py", line 38, in list queryset = self.filter_queryset(self.get_queryset()) File "/usr/local/lib/python3.13/site-packages/rest_framework/generics.py", line 154, in filter_queryset queryset = backend().filter_queryset(self.request, queryset, self) File "/usr/local/lib/python3.13/site-packages/django_filters/rest_framework/backends.py", line 66, in filter_queryset filterset = self.get_filterset(request, queryset, view) File "/usr/local/lib/python3.13/site-packages/django_filters/rest_framework/backends.py", line 18, in get_filterset filterset_class = self.get_filterset_class(view, queryset) File "/usr/local/lib/python3.13/site-packages/django_filters/rest_framework/backends.py", line 33, in get_filterset_class filterset_model = filterset_class._meta.model ^^^^^^^^^^^^^^^^^^^^^ AttributeError: 'list' object has no attribute '_meta'