Filtering not working correctly with 2.6.0

Related to #750. Appreciate the fix for this problem!!

Problem

When using filter_fields I get an error about using wrong types which started appearing in 2.4.0. Variable "userEmail" of type "String" used in position expecting type "ID". The error does not occur with graphene-django 2.3.2

Context

• using django-filter 2.2.0
• django 2.4.0
• graphene-django 2.6.0

model.py

class Membership(TimeStampedModel):
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    tenant = models.ForeignKey(Tenant, on_delete=models.CASCADE)



class User(TimeStampedModel, AbstractBaseUser, PermissionsMixin):
    email = EmailField(unique=True, verbose_name=_('email'))

    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = []

    objects = UserManager()

Schema.py

class MembershipNode(DjangoObjectType):
    class Meta:
        model = Membership
        filter_fields = {
            'id': ['exact'],
            'user__email': ['exact'],
        }
        interfaces = (MembershipNodeInterface,)

Query:

QUERY_MEMBERSHIPS = '''
    query memberships($tenant: String!, $userEmail: String) {
        memberships(tenant: $tenant, user_Email: $userEmail) {
            edges {
                node {
                    id
                    isFitter
                    isMonitor
                    isAdmin
                    isStaff
                }
            }
        }
    }
'''

Result: Variable "userEmail" of type "String" used in position expecting type "ID".

Solution

Should be related to #750. Might be a special case due to the email being the identifying field of the User

I am confident it is related to this PR: https://github.com/graphql-python/graphene-django/pull/682/files . In graphene_django/filter/utils.py the way how to retrieve the Type of a field was changed.

Keep on rocking 😃

[lassesteffen]

I see why it’s doing what it does. It is not coded to work with filtering on foreign keys, which is the problem here. Because the user field on Membership is indeed of type ID. But the problem is I am actually trying to filter by the email of the User model (which the user field is linking to.)
The split in line 21 in utils.py breaks it, since it is written under the assumption that there are no accesses to foreign keys, and the email part of the name is just ignored. There should actually be some kind of loop to work with filtering on foreign keys.
Or am I missing something?

[jkimbo]

The fix for this has been released: https://github.com/graphql-python/graphene-django/releases/tag/v2.7.0