diff --git a/graphene_django/forms/mutation.py b/graphene_django/forms/mutation.py
index f5921e8..1eeeb97 100644
--- a/graphene_django/forms/mutation.py
+++ b/graphene_django/forms/mutation.py
@@ -66,28 +66,6 @@ class BaseDjangoFormMutation(ClientIDMutation):
         return kwargs
 
 
-# class DjangoFormInputObjectTypeOptions(InputObjectTypeOptions):
-#     form_class = None
-
-
-# class DjangoFormInputObjectType(InputObjectType):
-#     class Meta:
-#         abstract = True
-
-#     @classmethod
-#     def __init_subclass_with_meta__(cls, form_class=None,
-#                                     only_fields=(), exclude_fields=(), _meta=None, **options):
-#         if not _meta:
-#             _meta = DjangoFormInputObjectTypeOptions(cls)
-#         assert isinstance(form_class, forms.Form), (
-#             'form_class must be an instance of django.forms.Form'
-#         )
-#         _meta.form_class = form_class
-#         form = form_class()
-#         fields = fields_for_form(form, only_fields, exclude_fields)
-#         super(DjangoFormInputObjectType, cls).__init_subclass_with_meta__(_meta=_meta, fields=fields, **options)
-
-
 class DjangoFormMutationOptions(MutationOptions):
     form_class = None
 
@@ -163,7 +141,9 @@ class DjangoModelFormMutation(BaseDjangoFormMutation):
 
         registry = get_global_registry()
         model_type = registry.get_type_for_model(model)
-        return_field_name = return_field_name
+        if not model_type:
+            raise Exception("No type registered for model: {}".format(model.__name__))
+
         if not return_field_name:
             model_name = model.__name__
             return_field_name = model_name[:1].lower() + model_name[1:]
diff --git a/graphene_django/forms/tests/test_mutation.py b/graphene_django/forms/tests/test_mutation.py
index 2de5113..494c77c 100644
--- a/graphene_django/forms/tests/test_mutation.py
+++ b/graphene_django/forms/tests/test_mutation.py
@@ -2,6 +2,8 @@ from django import forms
 from django.test import TestCase
 from py.test import raises
 
+from graphene import ObjectType, Schema, String, Field
+from graphene_django import DjangoObjectType
 from graphene_django.tests.models import Film, FilmDetails, Pet
 
 from ...settings import graphene_settings
@@ -18,6 +20,24 @@ class PetForm(forms.ModelForm):
         fields = "__all__"
 
 
+class PetType(DjangoObjectType):
+    class Meta:
+        model = Pet
+        fields = "__all__"
+
+
+class FilmType(DjangoObjectType):
+    class Meta:
+        model = Film
+        fields = "__all__"
+
+
+class FilmDetailsType(DjangoObjectType):
+    class Meta:
+        model = FilmDetails
+        fields = "__all__"
+
+
 def test_needs_form_class():
     with raises(Exception) as exc:
 
@@ -59,6 +79,10 @@ def test_mutation_error_camelcased():
     graphene_settings.CAMELCASE_ERRORS = False
 
 
+class MockQuery(ObjectType):
+    a = String()
+
+
 class ModelFormMutationTests(TestCase):
     def test_default_meta_fields(self):
         class PetMutation(DjangoModelFormMutation):
@@ -113,34 +137,70 @@ class ModelFormMutationTests(TestCase):
         self.assertEqual(PetMutation._meta.return_field_name, "animal")
         self.assertIn("animal", PetMutation._meta.fields)
 
-    def test_model_form_mutation_mutate(self):
+    def test_model_form_mutation_mutate_existing(self):
         class PetMutation(DjangoModelFormMutation):
+            pet = Field(PetType)
+
             class Meta:
                 form_class = PetForm
 
+        class Mutation(ObjectType):
+            pet_mutation = PetMutation.Field()
+
+        schema = Schema(query=MockQuery, mutation=Mutation)
+
         pet = Pet.objects.create(name="Axel", age=10)
 
-        result = PetMutation.mutate_and_get_payload(
-            None, None, id=pet.pk, name="Mia", age=10
+        result = schema.execute(
+            """ mutation PetMutation($pk: ID!) {
+                petMutation(input: { id: $pk, name: "Mia", age: 10 }) {
+                    pet {
+                        name
+                        age
+                    }
+                }
+            }
+            """,
+            variables={"pk": pet.pk},
         )
 
+        self.assertIs(result.errors, None)
+        self.assertEqual(result.data["petMutation"]["pet"], {"name": "Mia", "age": 10})
+
         self.assertEqual(Pet.objects.count(), 1)
         pet.refresh_from_db()
         self.assertEqual(pet.name, "Mia")
-        self.assertEqual(result.errors, [])
 
-    def test_model_form_mutation_updates_existing_(self):
+    def test_model_form_mutation_creates_new(self):
         class PetMutation(DjangoModelFormMutation):
+            pet = Field(PetType)
+
             class Meta:
                 form_class = PetForm
 
-        result = PetMutation.mutate_and_get_payload(None, None, name="Mia", age=10)
+        class Mutation(ObjectType):
+            pet_mutation = PetMutation.Field()
+
+        schema = Schema(query=MockQuery, mutation=Mutation)
+
+        result = schema.execute(
+            """ mutation PetMutation {
+                petMutation(input: { name: "Mia", age: 10 }) {
+                    pet {
+                        name
+                        age
+                    }
+                }
+            }
+            """
+        )
+        self.assertIs(result.errors, None)
+        self.assertEqual(result.data["petMutation"]["pet"], {"name": "Mia", "age": 10})
 
         self.assertEqual(Pet.objects.count(), 1)
         pet = Pet.objects.get()
         self.assertEqual(pet.name, "Mia")
         self.assertEqual(pet.age, 10)
-        self.assertEqual(result.errors, [])
 
     def test_model_form_mutation_mutate_invalid_form(self):
         class PetMutation(DjangoModelFormMutation):