Django Rest Framework - Could not resolve URL for hyperlinked relationship using view name “user-detail”

Question

I am building a project in Django Rest Framework where users can login to view their wine cellar. My ModelViewSets were working just fine and all of a sudden I get this frus

Answer 1

Bottle = serializers.PrimaryKeyRelatedField(read_only=True)

read_only allows you to represent the field without having to link it to another view of the model.

Answer 2

I got that error on DRF 3.7.7 when a slug value was empty (equals to '') in the database.

Answer 3

This code should work, too.

class BottleSerializer(serializers.HyperlinkedModelSerializer):

  user = UserSerializer()

  class Meta:
    model = Bottle
    fields = ('url', 'wine', 'user')

Answer 4

I ran into this same issue and resolved it by adding generics.RetrieveAPIView as a base class to my viewset.

Answer 5

I was stuck in this error for almost 2 hours:

ImproperlyConfigured at /api_users/users/1/ Could not resolve URL for hyperlinked relationship using view name "users-detail". You may have failed to include the related model in your API, or incorrectly configured the lookup_field attribute on this field.

When I finally get the solution but I don't understand why, so my code is:

#models.py
class Users(models.Model):
    id          = models.AutoField(primary_key=True)
    name        = models.CharField(max_length=50, blank=False, null=False)
    email       = models.EmailField(null=False, blank=False) 
    class Meta:
        verbose_name = "Usuario"
        verbose_name_plural = "Usuarios"

    def __str__(self):
        return str(self.name)


#serializers.py
class UserSerializer(serializers.HyperlinkedModelSerializer):
    class Meta:
        model = Users
        fields = (
            'id',
            'url',
            'name',        
            'email',       
            'description', 
            'active',      
            'age',         
            'some_date',   
            'timestamp',
            )
#views.py
class UserViewSet(viewsets.ModelViewSet):
    queryset = Users.objects.all()
    serializer_class = UserSerializer

#urls_api.py
router = routers.DefaultRouter()
router.register(r'users',UserViewSet, base_name='users')

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

but in my main URLs, it was:

urlpatterns = [
    url(r'^admin/', admin.site.urls),
    #api users
    url(r'^api_users/', include('usersApi.users_urls', namespace='api')),

]

So to finally I resolve the problem erasing namespace:

urlpatterns = [
    url(r'^admin/', admin.site.urls),
    #api users
    url(r'^api_users/', include('usersApi.users_urls')),

]

And I finally resolve my problem, so any one can let me know why, bests.

Answer 6

Today, I got the same error and below changes rescue me.

Change

class BottleSerializer(serializers.HyperlinkedModelSerializer):

to:

 class BottleSerializer(serializers.ModelSerializer):