Htykuut

I am getting the following error when I try to create a new object through the admin interface:

TypeError: unsupported operand type(s) for %: 'ImproperlyConfigured' and 'tuple'

I have the following models:

class CustomUser(AbstractUser):

    def __str__(self):

        return self.email



    class Meta:

        ordering = ('id',)

        verbose_name = 'user'



class Address(models.Model):

    """Address contains information about location. Address can be own by any

    kind of model."""

    content_type = models.ForeignKey(

        ContentType, on_delete=models.CASCADE, null=True

    )

    object_id = models.PositiveIntegerField(null=True)

    owner = GenericForeignKey("content_type", "object_id")



    CATEGORIES = Choices('billing', 'shipping')

    category = models.CharField(choices=CATEGORIES, max_length=16)

    address_1 = models.CharField("address line 1", max_length=128)

    address_2 = models.CharField("address line 2", max_length=128, blank=True)

    city = models.CharField(max_length=64)

    state_province = models.CharField('state/province', max_length=128)

    country = CountryField(blank_label='(select country)')

    zip_code = models.CharField(max_length=10)



    def __str__(self):

        return (

            f'{self.address_1}, {self.city}, {self.state_province}, '

            f'{self.country.name}, {self.zip_code}'

        )



    class Meta:

        ordering = ('id',)



class Company(Group):

    """An abstract base class that inherits Group."""

    addresses = GenericRelation(Address)

    owner = models.ForeignKey(User,

                              on_delete=models.CASCADE,

                              related_name='%(class)ss',

                              related_query_name='%(class)s')

    logo = CloudinaryField('image',

                           default='your_logo_here',

                           null=True,

                           blank=True)

    description = models.TextField('description', max_length=3000, blank=True)

    facebook_url = models.URLField('facebook url', blank=True)

    twitter_url = models.URLField('twitter url', blank=True)

    instagram_url = models.URLField('instagram url', blank=True)

    pinterest_url = models.URLField('pinterest url', blank=True)

    portfolio_url = models.URLField('portfolio url',  blank=True)

    phone_number = PhoneNumberField('phone number', blank=True)



    class Meta:

        abstract = True

        ordering = ('id',)





class Brand(Company):

    """A Brand can have multiple members."""

These are my serializers:

class CustomUserSerializer(HyperlinkedModelSerializer):

    brands = HyperlinkedRelatedField(

        many=True,

        read_only=True,

        view_name='brand-detail'

    )



    class Meta:

        model = CustomUser

        fields = (

            'url',

            'username',

            'email',

            'brands',

        )



class AddressSerializer(HyperlinkedModelSerializer):

    owner = GenericRelatedField({

        Brand: HyperlinkedRelatedField(

            queryset=Brand.objects.all(),

            view_name='brand-detail',

        )

    })



    class Meta:

        model = Address

        fields = (

            'url',

            'category',

            'address_1',

            'address_2',

            'city',

            'state_province',

            'country',

            'zip_code',

            'owner',

        )





class BrandSerializer(HyperlinkedModelSerializer):

    addresses = HyperlinkedRelatedField(many=True,

                                        read_only=True,

                                        view_name='address-detail')



    class Meta:

        model = Brand

        fields = (

            'url',

            'owner',

            'logo',

            'description',

            'facebook_url',

            'twitter_url',

            'instagram_url',

            'pinterest_url',

            'portfolio_url',

            'phone_number',

            'addresses',

        )

This is how I configured the urls:

router = DefaultRouter()

router.register('users', CustomUserViewSet)

router.register('addresses', AddressViewSet)

router.register('brands', BrandViewSet)



urlpatterns = [

    path('', include(router.urls)),

    path('auth/', include('rest_framework.urls', namespace='rest_framework')),

]

I can access http://localhost:8000/api/addresses/, and I have the following form:

The problem is when I try to POST to create a new object. I am getting that error I have described, and it seems because I am not passing properly the owner (actually I have no idea how to pass an object here, should I use a JSON or how).

Questions:

1. How can I solve this error because I am also trying to test the POST method, and it was when I realized this was not working?




2. Is there any way to include the fields of a GenericForeignKey in that form?

This is my traceback:

File "/Users/user/.local/share/virtualenvs/na-ERB0uoVd/lib/python3.7/site-packages/generic_relations/serializers.py" in to_internal_value

  39.             serializer = self.get_deserializer_for_data(data)



File "/Users/user/.local/share/virtualenvs/na-ERB0uoVd/lib/python3.7/site-packages/generic_relations/serializers.py" in get_deserializer_for_data

  75.                 'Could not determine a valid serializer for value %r.' % value)



During handling of the above exception (Could not determine a valid serializer for value ''.), another exception occurred:



File "/Users/user/.local/share/virtualenvs/na-ERB0uoVd/lib/python3.7/site-packages/rest_framework/serializers.py" in to_internal_value

  488.                 validated_value = field.run_validation(primitive_value)



File "/Users/user/.local/share/virtualenvs/na-ERB0uoVd/lib/python3.7/site-packages/rest_framework/fields.py" in run_validation

  536.         value = self.to_internal_value(data)



File "/Users/user/.local/share/virtualenvs/na-ERB0uoVd/lib/python3.7/site-packages/generic_relations/serializers.py" in to_internal_value

  41.             raise ValidationError(e)



During handling of the above exception (["Could not determine a valid serializer for value ''."]), another exception occurred:



File "/Users/user/.local/share/virtualenvs/na-ERB0uoVd/lib/python3.7/site-packages/rest_framework/fields.py" in get_error_detail

  240.         error_dict = exc_info.error_dict



During handling of the above exception ('ValidationError' object has no attribute 'error_dict'), another exception occurred:



File "/Users/user/.local/share/virtualenvs/na-ERB0uoVd/lib/python3.7/site-packages/django/core/handlers/exception.py" in inner

  34.             response = get_response(request)



File "/Users/user/.local/share/virtualenvs/na-ERB0uoVd/lib/python3.7/site-packages/django/core/handlers/base.py" in _get_response

  126.                 response = self.process_exception_by_middleware(e, request)



File "/Users/user/.local/share/virtualenvs/na-ERB0uoVd/lib/python3.7/site-packages/django/core/handlers/base.py" in _get_response

  124.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)



File "/Users/user/.local/share/virtualenvs/na-ERB0uoVd/lib/python3.7/site-packages/django/views/decorators/csrf.py" in wrapped_view

  54.         return view_func(*args, **kwargs)



File "/Users/user/.local/share/virtualenvs/na-ERB0uoVd/lib/python3.7/site-packages/rest_framework/viewsets.py" in view

  116.             return self.dispatch(request, *args, **kwargs)



File "/Users/user/.local/share/virtualenvs/na-ERB0uoVd/lib/python3.7/site-packages/rest_framework/views.py" in dispatch

  495.             response = self.handle_exception(exc)



File "/Users/user/.local/share/virtualenvs/na-ERB0uoVd/lib/python3.7/site-packages/rest_framework/views.py" in handle_exception

  455.             self.raise_uncaught_exception(exc)



File "/Users/user/.local/share/virtualenvs/na-ERB0uoVd/lib/python3.7/site-packages/rest_framework/views.py" in dispatch

  492.             response = handler(request, *args, **kwargs)



File "/Users/user/.local/share/virtualenvs/na-ERB0uoVd/lib/python3.7/site-packages/rest_framework/mixins.py" in create

  20.         serializer.is_valid(raise_exception=True)



File "/Users/user/.local/share/virtualenvs/na-ERB0uoVd/lib/python3.7/site-packages/rest_framework/serializers.py" in is_valid

  236.                 self._validated_data = self.run_validation(self.initial_data)



File "/Users/user/.local/share/virtualenvs/na-ERB0uoVd/lib/python3.7/site-packages/rest_framework/serializers.py" in run_validation

  434.         value = self.to_internal_value(data)



File "/Users/user/.local/share/virtualenvs/na-ERB0uoVd/lib/python3.7/site-packages/rest_framework/serializers.py" in to_internal_value

  494.                 errors[field.field_name] = get_error_detail(exc)



File "/Users/user/.local/share/virtualenvs/na-ERB0uoVd/lib/python3.7/site-packages/rest_framework/fields.py" in get_error_detail

  245.             for error in exc_info.error_list]



File "/Users/user/.local/share/virtualenvs/na-ERB0uoVd/lib/python3.7/site-packages/rest_framework/fields.py" in <listcomp>

  245.             for error in exc_info.error_list]



Exception Type: TypeError at /api/addresses/

Exception Value: unsupported operand type(s) for %: 'ImproperlyConfigured' and 'tuple'

If add read_only=True like the following:

owner = GenericRelatedField({

    Brand: HyperlinkedRelatedField(

        queryset=Brand.objects.all(),

        view_name='brand-detail',

    )

}, read_only=True)

the error will disappear. But then you need to write your
own create() method in the same serializer with serialization of owner to account for how
you would like to save owner.