AttributeError at /api/v1/store/products/create/
'Attribute' object has no attribute 'is_required'

Traceback:

File "/usr/local/lib/python3.8/site-packages/django/core/handlers/exception.py" in inner
  34.             response = get_response(request)

File "/usr/local/lib/python3.8/site-packages/django/core/handlers/base.py" in _get_response
  115.                 response = self.process_exception_by_middleware(e, request)

File "/usr/local/lib/python3.8/site-packages/django/core/handlers/base.py" in _get_response
  113.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/usr/local/lib/python3.8/site-packages/django/views/decorators/csrf.py" in wrapped_view
  54.         return view_func(*args, **kwargs)

File "/usr/local/lib/python3.8/site-packages/django/views/generic/base.py" in view
  71.             return self.dispatch(request, *args, **kwargs)

File "/code/server/shared/rest/mixins.py" in dispatch
  24.         return super().dispatch(request, *args, **kwargs)

File "/usr/local/lib/python3.8/site-packages/rest_framework/views.py" in dispatch
  505.             response = self.handle_exception(exc)

File "/usr/local/lib/python3.8/site-packages/rest_framework/views.py" in handle_exception
  465.             self.raise_uncaught_exception(exc)

File "/usr/local/lib/python3.8/site-packages/rest_framework/views.py" in raise_uncaught_exception
  476.         raise exc

File "/usr/local/lib/python3.8/site-packages/rest_framework/views.py" in dispatch
  502.             response = handler(request, *args, **kwargs)

File "/usr/local/lib/python3.8/site-packages/rest_framework/generics.py" in post
  190.         return self.create(request, *args, **kwargs)

File "/usr/local/lib/python3.8/site-packages/rest_framework/mixins.py" in create
  17.         serializer = self.get_serializer(data=request.data)

File "/usr/local/lib/python3.8/site-packages/rest_framework/generics.py" in get_serializer
  110.         return serializer_class(*args, **kwargs)

File "/code/server/api/rest/store/serializers/product/create.py" in __init__
  109.                 AttributesSerializer()

File "/code/server/api/rest/store/serializers/product/create.py" in __init__
  26.         self.fields.update(self.create_attributes_fields(category))

File "/code/server/api/rest/store/serializers/product/create.py" in create_attributes_fields
  45.                     required=attribute.is_required

Exception Type: AttributeError at /api/v1/store/products/create/
Exception Value: 'Attribute' object has no attribute 'is_required'
Request information:
USER: ДМИТРІЄВА КАТЕРИНА СЕРГІЇВНА