Using default user and Model with FileField

[Cody Scott]

I'm using a ModelViewSet with a Model that has a FileField.

When I try to create a model object without the optional file I get the error that

ValueError: Cannot assign "<User: one>": "Page.user" must be a "User" instance.

RROR: test_create_page_endpoint (api.tests.test_pages.PageTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/siecje/Desktop/agora/api/tests/test_pages.py", line 26, in test_create_page_endpoint
    response = self.client.post(url, data)
  File "/home/siecje/Desktop/agora/venv/local/lib/python2.7/site-packages/rest_framework/test.py", line 168, in post
    path, data=data, format=format, content_type=content_type, **extra)
  File "/home/siecje/Desktop/agora/venv/local/lib/python2.7/site-packages/rest_framework/test.py", line 90, in post
    return self.generic('POST', path, data, content_type, **extra)
  File "/home/siecje/Desktop/agora/venv/local/lib/python2.7/site-packages/rest_framework/compat.py", line 222, in generic
    return self.request(**r)
  File "/home/siecje/Desktop/agora/venv/local/lib/python2.7/site-packages/rest_framework/test.py", line 157, in request
    return super(APIClient, self).request(**kwargs)
  File "/home/siecje/Desktop/agora/venv/local/lib/python2.7/site-packages/rest_framework/test.py", line 109, in request
    request = super(APIRequestFactory, self).request(**kwargs)
  File "/home/siecje/Desktop/agora/venv/local/lib/python2.7/site-packages/django/test/client.py", line 466, in request
    six.reraise(*exc_info)
  File "/home/siecje/Desktop/agora/venv/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 132, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/siecje/Desktop/agora/venv/local/lib/python2.7/site-packages/django/views/decorators/csrf.py", line 58, in wrapped_view
    return view_func(*args, **kwargs)
  File "/home/siecje/Desktop/agora/venv/local/lib/python2.7/site-packages/rest_framework/viewsets.py", line 85, in view
    return self.dispatch(request, *args, **kwargs)
  File "/home/siecje/Desktop/agora/venv/local/lib/python2.7/site-packages/rest_framework/views.py", line 451, in dispatch
    response = self.handle_exception(exc)
  File "/home/siecje/Desktop/agora/venv/local/lib/python2.7/site-packages/rest_framework/views.py", line 448, in dispatch
    response = handler(request, *args, **kwargs)
  File "/home/siecje/Desktop/agora/venv/local/lib/python2.7/site-packages/rest_framework/mixins.py", line 20, in create
    self.perform_create(serializer)
  File "/home/siecje/Desktop/agora/api/views.py", line 29, in perform_create
    serializer.save(stylesheet=self.request.data.get('stylesheet'))
  File "/home/siecje/Desktop/agora/venv/local/lib/python2.7/site-packages/rest_framework/serializers.py", line 165, in save
    self.instance = self.create(validated_data)
  File "/home/siecje/Desktop/agora/venv/local/lib/python2.7/site-packages/rest_framework/serializers.py", line 775, in create
    instance = ModelClass.objects.create(**validated_data)
  File "/home/siecje/Desktop/agora/venv/local/lib/python2.7/site-packages/django/db/models/manager.py", line 127, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/home/siecje/Desktop/agora/venv/local/lib/python2.7/site-packages/django/db/models/query.py", line 346, in create
    obj = self.model(**kwargs)
  File "/home/siecje/Desktop/agora/venv/local/lib/python2.7/site-packages/django/db/models/base.py", line 468, in __init__
    setattr(self, field.name, rel_obj)
  File "/home/siecje/Desktop/agora/venv/local/lib/python2.7/site-packages/django/db/models/fields/related.py", line 627, in __set__
    self.field.rel.to._meta.object_name,
ValueError: Cannot assign "<User: one>": "Page.user" must be a "User" instance.


class PageTests(APITestCase):

    def setUp(self):
        self.user = User.objects.create_user(
            username='one', email='o...@example.com', password='one')

        token = Token.objects.get(user__username=self.user.username)
        self.client.credentials(HTTP_AUTHORIZATION='Token ' + token.key)

    def test_create_page_endpoint(self):
        url = reverse('page-list')

        data = {
            'name': 'Endpoint Works',
        }

        response = self.client.post(url, data, format='json')
        self.assertEqual(response.status_code, status.HTTP_201_CREATED)
        self.assertEqual(response.data['name'], 'Endpoint Works')


class PageSerializer(serializers.ModelSerializer):
    user = serializers.HiddenField(
        default=serializers.CurrentUserDefault()
    )

    class Meta:
        model = Page
        fields = ('id', 'name', 'stylesheet', 'user', 'created', 'updated')


class User(AuthUser):
    class Meta:
        proxy = True


class Common(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)

    class Meta:
        abstract = True


class Page(Common):
    name = models.TextField()
    stylesheet = models.FileField(null=True, blank=True)

    user = models.ForeignKey(User, related_name='pages')

    def __str__(self):
        return self.name

class PageViewSet(viewsets.ModelViewSet):
    lookup_field = 'id'
    parser_classes = (MultiPartParser, FormParser,)
    permission_classes = (permissions.IsAuthenticatedOrReadOnly,)
    queryset = Page.objects.all()
    serializer_class = PageSerializer

    def perform_create(self, serializer):
        serializer.save(stylesheet=self.request.data.get('stylesheet'))


page_list = views.PageViewSet.as_view({
    'get': 'list',
    'post': 'create'
})

page_detail = views.PageViewSet.as_view({
    'get': 'retrieve',
    'put': 'update',
    'patch': 'partial_update',
    'delete': 'destroy'
})

    url(r'^pages/?$',
        page_list,
        name='page-list'),
    url(r'^pages/(?P<id>[^/]+)/?$',
        page_detail,
        name='page-detail'),

[Vinaya Bharathi Mohandoss]

Hi

did you get a solution to this issue? I am facing the same problem now actually.. 

Thanks

Vinaya

[Cody Scott]

I was using a proxy model for User and using that for the foreign key fields.

https://github.com/Siecje/debt/commit/cffd5ac72d75a5400a57e5688de0861ccc2dacda

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