Custom Validation Error for @api.expect(validate=True)

[psdon]

Is there a way to create a custom validation error for @api.expect(validation=True)?

@api.route('/some-route')
class SomeResource(Resource):

    @api.expect(fields, validate=True)
    def post(self):
        pass

The default validation error I get when I post something illegal is something like this:

{
  "errors": {
    "field": "'field' is a required property"
  },
  "message": "Input payload validation failed"
}

I would like it to be customized to:

{
    "error": "Please input the field"
}

[knowBalpreet]

one way is to use the flask after_request method and do these changes there. just check if 'errors' field is present in the response, if it is there. modify it. Consider the following example:

 @app.after_request
  def after_request(response):
    if int(response.status_code) == 404:
      response.set_data(dumps({'success': False, 'data': [],
                               'msg': 'Resource not found. Check Resouce URI again'}))

    if int(response.status_code) >= 400:
      response_data = loads(response.get_data())
      if 'errors' in response_data:
        response_data = {"error": "Please input the field"}
        response.set_data(dumps(response_data))
      response.headers.add('Content-Type', 'application/json')
    return response

[peterjwest]

I could do with this, would you like to port this to flask-restx? Or do you mind if I do?