Custom URL Map Converter

[debaillie]

I am having an issue with getting this to work with a custom url map converter.

Here is a snippet of what I'm trying to do:

import os

import flask
from flask_restful_swagger_2 import Api

from device_key import DeviceKeyConverter
from resources.device import Device, DeviceList


app = flask.Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///data.db'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False

api = Api(app, api_version='0.0', 
        api_spec_url='/api', 
        produces=['application/json', 'text/html']
        )
app.url_map.converters['device_key'] = DeviceKeyConverter

api.add_resource(Device, '/devices/<device_key:device_key>')
api.add_resource(DeviceList, '/devices')

With the coverer looking like this:

from werkzeug.routing import BaseConverter
from special_serial_number import SpecialSerialNumber

class DeviceKeyConverter(BaseConverter):
    def to_python(self, value):
        if (isinstance(value, int)) or (':' not in value):
            return int(value)
        return SpecialSerialNumber(value)

    def to_url(self, value):
        if isinstance(value, int):
            return int(value)
        return str(value)

When I run my app I get an error on the line:

api.add_resource(Device, '/devices/<device_key:device_key>')

Here is the error:

Traceback (most recent call last):
  File "/home/tim/work/backend/venv/lib/python3.5/site-packages/flask_restful_swagger_2/swagger.py", line 268, in validate_operation_object
  validate_reference_object(parameter)
  File "/home/tim/work/backend/venv/lib/python3.5/site-packages/flask_restful_swagger_2/swagger.py", line 324, in validate_reference_object
  raise ValidationError('Invalid reference object. It may only contain key "$ref"')
  flask_restful_swagger_2.swagger.ValidationError: Invalid reference object. It may only contain key "$ref"

  During handling of the above exception, another exception occurred:

  Traceback (most recent call last):
    File "src/app.py", line 47, in <module>
    api.add_resource(Device, '/devices/<device_key:device_key>')
  File "/home/tim/work/backend/venv/lib/python3.5/site-packages/flask_restful_swagger_2/__init__.py", line 119, in add_resource
    validate_path_item_object(path_item)
  File "/home/tim/work/backend/venv/lib/python3.5/site-packages/flask_restful_swagger_2/swagger.py", line 232, in validate_path_item_object
    validate_operation_object(v)
  File "/home/tim/work/backend/venv/lib/python3.5/site-packages/flask_restful_swagger_2/swagger.py", line 270, in validate_operation_object
    validate_parameter_object(parameter)
    File "/home/tim/work/backend/venv/lib/python3.5/site-packages/flask_restful_swagger_2/swagger.py", line 295, in validate_parameter_object
    url='http://swagger.io/specification/#parameterObject'))
    flask_restful_swagger_2.swagger.ValidationError: Invalid parameter object. Unknown field "allowMultiple". See http://swagger.io/specification/#parameterObject

Does this package not support custom URL Map Converters?