Added a DjangoToManyField to handle to-many relationships

To-many relationships return a manager, which needs to be turned
into an iterable (its queryset) using `maybe_queryset`.

graphene_django/converter.py

@@ -10,7 +10,7 @@ from graphene.utils.str_converters import to_const
 
 from .compat import (ArrayField, HStoreField, JSONField, RangeField,
                      RelatedObject, UUIDField)
-from .fields import get_connection_field
+from .fields import get_connection_field, DjangoToManyField
 from .utils import get_related_model, import_single_dispatch
 
 singledispatch = import_single_dispatch()
@@ -132,7 +132,8 @@ def convert_field_to_list_or_connection(field, registry=None):
 
         if is_node(_type):
             return get_connection_field(_type)
-        return Field(List(_type))
+
+        return DjangoToManyField(_type)
 
     return Dynamic(dynamic_type)
 
@@ -152,7 +153,7 @@ def convert_relatedfield_to_djangomodel(field, registry=None):
 
         if is_node(_type):
             return get_connection_field(_type)
-        return Field(List(_type))
+        return DjangoToManyField(_type)
 
     return Dynamic(dynamic_type)
 

graphene_django/fields.py

@@ -2,12 +2,26 @@ from functools import partial
 
 from django.db.models.query import QuerySet
 
+from graphene.types import Field, List
 from graphene.relay import ConnectionField, PageInfo
 from graphql_relay.connection.arrayconnection import connection_from_list_slice
 
 from .utils import DJANGO_FILTER_INSTALLED, maybe_queryset
 
 
+class DjangoToManyField(Field):
+
+    def __init__(self, _type, *args, **kwargs):
+        return super(DjangoToManyField, self).__init__(List(_type), *args, **kwargs)
+
+    @staticmethod
+    def rel_resolver(resolver, root, args, context, info):
+        return maybe_queryset(resolver(root, args, context, info))
+
+    def get_resolver(self, parent_resolver):
+        return partial(self.rel_resolver, parent_resolver)
+
+
 class DjangoConnectionField(ConnectionField):
 
     def __init__(self, *args, **kwargs):