Nested field throwing errors

[kennell]

Hi there, using the example provided in the README, i was trying the following:

My Django models:

# models.py

class Artist(models.Model):
    name = models.CharField(max_length=140)


class Album(models.Model):
    title = models.CharField(max_length=140)
    release_date = models.DateField()
    artist = models.ForeignKey(Artist)

The Marshmallow Schemas and DRF Viewsets:

# views.py

class ArtistSchema(Schema):
    name = fields.String()


class AlbumSchema(Schema):
    title = fields.String()
    release_date = fields.Date()
    artist = fields.Nested(ArtistSchema)


class ArtistViewSet(viewsets.ModelViewSet):
    queryset = Artist.objects.all()
    serializer_class = ArtistSchema


class AlbumViewSet(viewsets.ModelViewSet):
    queryset = Album.objects.all()
    serializer_class = AlbumSchema

Finally, my URL configuration:

# urls.py

router = routers.DefaultRouter()
router.register(r'artists', ArtistViewSet, base_name='artists')
router.register(r'albums', AlbumViewSet, base_name='albums')


urlpatterns = [
    url(r'^api/', include(router.urls)),
]

When sending a HTTP GET to /api/albums/ i am geting the following trace:

Django version 1.10.5, using settings 'songify.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CONTROL-C.
Internal Server Error: /api/albums/
Traceback (most recent call last):
  File "/Users/k/.virtualenvs/songify/lib/python3.6/site-packages/django/core/handlers/exception.py", line 39, in inner
    response = get_response(request)
  File "/Users/k/.virtualenvs/songify/lib/python3.6/site-packages/django/core/handlers/base.py", line 187, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/Users/k/.virtualenvs/songify/lib/python3.6/site-packages/django/core/handlers/base.py", line 185, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/Users/k/.virtualenvs/songify/lib/python3.6/site-packages/django/views/decorators/csrf.py", line 58, in wrapped_view
    return view_func(*args, **kwargs)
  File "/Users/k/.virtualenvs/songify/lib/python3.6/site-packages/rest_framework/viewsets.py", line 83, in view
    return self.dispatch(request, *args, **kwargs)
  File "/Users/k/.virtualenvs/songify/lib/python3.6/site-packages/rest_framework/views.py", line 483, in dispatch
    response = self.handle_exception(exc)
  File "/Users/k/.virtualenvs/songify/lib/python3.6/site-packages/rest_framework/views.py", line 443, in handle_exception
    self.raise_uncaught_exception(exc)
  File "/Users/k/.virtualenvs/songify/lib/python3.6/site-packages/rest_framework/views.py", line 480, in dispatch
    response = handler(request, *args, **kwargs)
  File "/Users/k/.virtualenvs/songify/lib/python3.6/site-packages/rest_framework/mixins.py", line 48, in list
    return Response(serializer.data)
  File "/Users/k/.virtualenvs/songify/lib/python3.6/site-packages/rest_framework/serializers.py", line 729, in data
    ret = super(ListSerializer, self).data
  File "/Users/k/.virtualenvs/songify/lib/python3.6/site-packages/rest_framework/serializers.py", line 262, in data
    self._data = self.to_representation(self.instance)
  File "/Users/k/.virtualenvs/songify/lib/python3.6/site-packages/rest_framework/serializers.py", line 647, in to_representation
    self.child.to_representation(item) for item in iterable
  File "/Users/k/.virtualenvs/songify/lib/python3.6/site-packages/rest_framework/serializers.py", line 647, in <listcomp>
    self.child.to_representation(item) for item in iterable
  File "/Users/k/.virtualenvs/songify/lib/python3.6/site-packages/rest_marshmallow/__init__.py", line 27, in to_representation
    return self.dump(instance).data
  File "/Users/k/.virtualenvs/songify/lib/python3.6/site-packages/marshmallow/schema.py", line 511, in dump
    **kwargs
  File "/Users/k/.virtualenvs/songify/lib/python3.6/site-packages/marshmallow/marshalling.py", line 147, in serialize
    index=(index if index_errors else None)
  File "/Users/k/.virtualenvs/songify/lib/python3.6/site-packages/marshmallow/marshalling.py", line 68, in call_and_store
    value = getter_func(data)
  File "/Users/k/.virtualenvs/songify/lib/python3.6/site-packages/marshmallow/marshalling.py", line 141, in <lambda>
    getter = lambda d: field_obj.serialize(attr_name, d, accessor=accessor)
  File "/Users/k/.virtualenvs/songify/lib/python3.6/site-packages/marshmallow/fields.py", line 252, in serialize
    return self._serialize(value, attr, obj)
  File "/Users/k/.virtualenvs/songify/lib/python3.6/site-packages/marshmallow/fields.py", line 444, in _serialize
    schema = self.schema
  File "/Users/k/.virtualenvs/songify/lib/python3.6/site-packages/marshmallow/fields.py", line 415, in schema
    dump_only=self._nested_normalized_option('dump_only'))
  File "/Users/k/.virtualenvs/songify/lib/python3.6/site-packages/rest_marshmallow/__init__.py", line 23, in __init__
    super(Schema, self).__init__(*args, **kwargs)
  File "/Users/k/.virtualenvs/songify/lib/python3.6/site-packages/rest_framework/serializers.py", line 118, in __init__
    super(BaseSerializer, self).__init__(**kwargs)
TypeError: __init__() got an unexpected keyword argument 'load_only'
[21/Feb/2017 22:06:44] "GET /api/albums/ HTTP/1.1" 500 16063

When i remove the artist = fields.Nested(ArtistSchema) from the AlbumSchema class, i receive a valid response without any errors. This is on Python 3.6, using the following package versions:

appdirs==1.4.0
Django==1.10.5
django-rest-marshmallow==2.0.0
djangorestframework==3.5.4
marshmallow==2.13.0
packaging==16.8
pyparsing==2.1.10
six==1.10.0

[devashishsharma2302]

I am getting the same error too.

[devashishsharma2302]

Fixed #13