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TypeError: int() argument must be a string, a bytes-like object or a number, not 'InstrumentedAttribute'

See original GitHub issue

Using the Swagger interface i’m trying to make a PUT request. This triggers the update but i get an error in the response and in the console where i’m running the server.

Response error:

{
  "message": "Internal Server Error"
}

I’m using Flask_api_example, the tests all pass fine but making a PUT request in the swagger interface (127.0.0.1:5000) triggers this error. The entry gets updated just fine, couldn’t find the issue in my implementation so i think it can be related to flask_accepts.

127.0.0.1 - - [12/Nov/2019 20:22:47] "GET /api/barbota/ranks/ HTTP/1.1" 200 -
[2019-11-12 20:22:57,833] ERROR in app: Exception on /api/barbota/ranks/1 [PUT]
Traceback (most recent call last):
  File "/home/bledy/projects/barbota-api/.venv/lib/python3.7/site-packages/flask/app.py", line 1949, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/bledy/projects/barbota-api/.venv/lib/python3.7/site-packages/flask/app.py", line 1935, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/bledy/projects/barbota-api/.venv/lib/python3.7/site-packages/flask_restplus/api.py", line 325, in wrapper
    resp = resource(*args, **kwargs)
  File "/home/bledy/projects/barbota-api/.venv/lib/python3.7/site-packages/flask/views.py", line 89, in view
    return self.dispatch_request(*args, **kwargs)
  File "/home/bledy/projects/barbota-api/.venv/lib/python3.7/site-packages/flask_restplus/resource.py", line 44, in dispatch_request
    resp = meth(*args, **kwargs)
  File "/home/bledy/projects/barbota-api/.venv/lib/python3.7/site-packages/flask_accepts/decorators/decorators.py", line 100, in inner
    return func(*args, **kwargs)
  File "/home/bledy/projects/barbota-api/.venv/lib/python3.7/site-packages/flask_accepts/decorators/decorators.py", line 186, in inner
    serialized = schema.dump(rv)
  File "/home/bledy/projects/barbota-api/.venv/lib/python3.7/site-packages/marshmallow/schema.py", line 553, in dump
    result = self._serialize(processed_obj, many=many)
  File "/home/bledy/projects/barbota-api/.venv/lib/python3.7/site-packages/marshmallow/schema.py", line 517, in _serialize
    value = field_obj.serialize(attr_name, obj, accessor=self.get_attribute)
  File "/home/bledy/projects/barbota-api/.venv/lib/python3.7/site-packages/marshmallow/fields.py", line 325, in serialize
    return self._serialize(value, attr, obj, **kwargs)
  File "/home/bledy/projects/barbota-api/.venv/lib/python3.7/site-packages/marshmallow/fields.py", line 899, in _serialize
    ret = self._format_num(value)  # type: _T
  File "/home/bledy/projects/barbota-api/.venv/lib/python3.7/site-packages/marshmallow/fields.py", line 874, in _format_num
    return self.num_type(value)
TypeError: int() argument must be a string, a bytes-like object or a number, not 'InstrumentedAttribute'