diff --git a/graphene_django/converter.py b/graphene_django/converter.py
index c0bc009..79412ff 100644
--- a/graphene_django/converter.py
+++ b/graphene_django/converter.py
@@ -186,7 +186,7 @@ def convert_onetoone_field_to_djangomodel(field, registry=None):
 @convert_django_field.register(models.ManyToManyRel)
 @convert_django_field.register(models.ManyToOneRel)
 def convert_field_to_list_or_connection(field, registry=None):
-    model = field.related_model
+    model = registry.get_model_by_string(field._raw_class)
 
     def dynamic_type():
         _type = registry.get_type_for_model(model)
diff --git a/graphene_django/registry.py b/graphene_django/registry.py
index 50a8ae5..5a7b2af 100644
--- a/graphene_django/registry.py
+++ b/graphene_django/registry.py
@@ -19,8 +19,16 @@ class Registry(object):
             self._registry[cls._meta.model] = cls
 
     def get_type_for_model(self, model):
+        print(model)
+        if isinstance(model, str):
+            model = self.get_model_by_string(model)
         return self._registry.get(model)
 
+    def get_model_by_string(self, model):
+        print(self._registry.keys())
+        return filter(lambda x: model == x.__name__, self._registry.keys())[0]
+
+
     def register_converted_field(self, field, converted):
         self._field_registry[field] = converted