M2M connection is broken

Hi,

I have following models:

class Place(models.Model):
    categories = models.ManyToManyField(PlaceCategory, related_name='places')

class PlaceCategory(models.Model):
    name = models.CharField(max_length=255, unique=True)

Furthermore, I have following DjangoObjectType models:

class PlaceNode(DjangoObjectType):
    class Meta:
        model = Place
        interfaces = (graphene.relay.Node, )

class PlaceCategoryNode(DjangoObjectType):
    class Meta:
        model = PlaceCategory
        interfaces = (graphene.relay.Node, )

Then when I execute this query:

{
  placeCategories {
    edges {
      node {
        id
        places {
          edges {
            node {
              id
            }
          }
        }
      }
    }
  }
}

everything works great but when I try to execute this one:

{
  places {
    edges {
      node {
        id
        categories {
          edges {
            node {
              id
            }
          }
        }
      }
    }
  }
}

I get errors:

Cannot combine queries on two different base models.

It seems that M2M connection is working improperly and it is unable to fetch related objects from instance where M2M is defined.

Has anyone run into the same problem ?

[kozickikarol]

You can just define custom resolver and return queryset. It should work.

In my case it would be:

class PlaceNode(DjangoObjectType):
    class Meta:
        model = Place
        interfaces = (graphene.relay.Node, )

    categories = DjangoFilterConnectionField(PlaceCategoryNode)

    def resolve_categories(self, *args):
        return self.categories.all()

But this is only a workaround. In my case when I have lots of M2M it is annoying that I have to define custom resolvers for all of them.

[spockNinja]

@keremgocen No, this was not merged in time for the 1.3 release. There has not been a new release to pypi since this was merged. From the commit log, it looks like a release is pushed about every month or so, so I don’t expect it will be too long.

In the meantime, you can pull down master instead of 1.3.

pip uninstall graphene-django pip install git+https://github.com/graphql-python/graphene-django.git

or in requirements.txt pip install git+ssh://[e-mail]/graphql-python/graphene-django.git#egg=graphene-django