Merge pull request #297 from sjhewitt/connection-node

relay Connection.node does not have to subclass Node/ObjectType

Author: syrusakbary

graphene/relay/connection.py

@@ -6,13 +6,14 @@
 
 from graphql_relay import connection_from_list
 
-from ..types import AbstractType, Boolean, Int, List, String
+from ..types import (AbstractType, Boolean, Enum, Int, Interface, List, NonNull, Scalar, String,
+                     Union)
 from ..types.field import Field
 from ..types.objecttype import ObjectType, ObjectTypeMeta
 from ..types.options import Options
 from ..utils.is_base_type import is_base_type
 from ..utils.props import props
-from .node import Node, is_node
+from .node import is_node
 
 
 class PageInfo(ObjectType):
@@ -57,7 +58,7 @@ def __new__(cls, name, bases, attrs):
         options.local_fields = OrderedDict()
 
         assert options.node, 'You have to provide a node in {}.Meta'.format(cls.__name__)
-        assert issubclass(options.node, (Node, ObjectType)), (
+        assert issubclass(options.node, (Scalar, Enum, ObjectType, Interface, Union, NonNull)), (
             'Received incompatible node "{}" for Connection {}.'
         ).format(options.node, name)