Allow using a custom resolver function on DjangoConnectionField

Author: mb1511

graphene_django/fields.py

@@ -251,9 +251,12 @@ def connection_resolver(
         return on_resolve(iterable)
 
     def wrap_resolve(self, parent_resolver):
+        # skip the wrap_resolve method on ConnectionField as it's already
+        # wrapping the connection_resolver, so we don't want to do it twice
+        resolver = super(ConnectionField, self).wrap_resolve(parent_resolver)
         return partial(
             self.connection_resolver,
-            parent_resolver,
+            resolver,
             self.connection_type,
             self.get_manager(),
             self.get_queryset_resolver(),

graphene_django/tests/test_fields.py

@@ -748,3 +748,35 @@ class Query(ObjectType):
             match="DjangoConnectionField only accepts DjangoObjectType types as underlying type",
         ):
             Schema(query=Query)
+
+    def test_can_use_custom_resolver(self):
+        def resolve_some_people(*args, **kwargs):
+            return PersonModel.objects.filter(name="Bob")
+
+        class PersonType(DjangoObjectType):
+            class Meta:
+                model = PersonModel
+                interfaces = (Node,)
+
+        class Query(ObjectType):
+            people = DjangoConnectionField(PersonType, resolver=resolve_some_people)
+
+        schema = Schema(query=Query)
+        PersonModel.objects.create(name="Bob")
+        PersonModel.objects.create(name="Alice")
+
+        query = """
+            query {
+                people {
+                    edges {
+                        node {
+                            name
+                        }
+                    }
+                }
+            }
+        """
+
+        result = schema.execute(query)
+        assert not result.errors
+        assert result.data == {"people": {"edges": [{"node": {"name": "Bob"}}]}}