Improved extend interfaces syntax

examples/starwars/schema.py

@@ -21,17 +21,11 @@ class Character(graphene.Interface):
         return [get_character(f) for f in self.friends]
 
 
-# @graphene.implements(Character)
-class Human(graphene.ObjectType):
-    class Meta:
-        interfaces = [Character]
+class Human(graphene.ObjectType, Character):
     home_planet = graphene.String()
 
 
-# @graphene.implements(Character)
-class Droid(graphene.ObjectType):
-    class Meta:
-        interfaces = [Character]
+class Droid(graphene.ObjectType, Character):
     primary_function = graphene.String()
 
 

examples/starwars_relay/schema.py

@@ -4,10 +4,7 @@ from graphene import implements, relay, resolve_only_args
 from .data import create_ship, get_empire, get_faction, get_rebels, get_ship
 
 
-# @implements(relay.Node)
-class Ship(graphene.ObjectType):
-    class Meta:
-        interfaces = [relay.Node]
+class Ship(graphene.ObjectType, relay.Node):
     '''A ship in the Star Wars saga'''
     name = graphene.String(description='The name of the ship.')
 
@@ -16,10 +13,7 @@ class Ship(graphene.ObjectType):
         return get_ship(id)
 
 
-# @implements(relay.Node)
-class Faction(graphene.ObjectType):
-    class Meta:
-        interfaces = [relay.Node]
+class Faction(graphene.ObjectType, relay.Node):
     '''A faction in the Star Wars saga'''
     name = graphene.String(description='The name of the faction.')
     # ships = relay.ConnectionField(

graphene/relay/node.py

@@ -4,15 +4,14 @@ import six
 from graphql_relay import node_definitions, from_global_id, to_global_id
 
 from ..types.field import Field
+from ..types.objecttype import ObjectTypeMeta
 from ..types.interface import GrapheneInterfaceType, Interface, InterfaceTypeMeta
 
 
-class NodeMeta(InterfaceTypeMeta):
-
-    def construct_graphql_type(cls, bases):
-        pass
+class NodeMeta(ObjectTypeMeta):
 
     def construct(cls, bases, attrs):
+        if not cls.is_object_type():
             cls.get_node = attrs.pop('get_node')
             cls.id_resolver = attrs.pop('id_resolver', None)
             node_interface, node_field = node_definitions(

graphene/relay/tests/test_node.py

@@ -7,9 +7,7 @@ from ...types import ObjectType, Schema, implements
 from ...types.scalars import String
 
 
-class MyNode(ObjectType):
-    class Meta:
-        interfaces = [Node]
+class MyNode(ObjectType, Node):
 
     name = String()
 

graphene/relay/tests/test_node_custom.py

@@ -15,17 +15,11 @@ class CustomNode(Node):
             return photo_data.get(id)
 
 
-# @implements(CustomNode)
-class User(ObjectType):
-    class Meta:
-        interfaces = [CustomNode]
+class User(ObjectType, CustomNode):
     name = String()
 
 
-# @implements(CustomNode)
-class Photo(ObjectType):
-    class Meta:
-        interfaces = [CustomNode]
+class Photo(ObjectType, CustomNode):
     width = Int()
 
 

graphene/types/field.py

@@ -69,34 +69,36 @@ class Field(AbstractField, GraphQLField, OrderedType):
         self.attname = attname
         self.parent = parent
 
+    def default_resolver(self, root, args, context, info):
+        return getattr(root, self.source or self.attname, None)
+
     @property
     def resolver(self):
         from .objecttype import ObjectType
         from .interface import GrapheneInterfaceType
-        def default_resolver(root, args, context, info):
-            return getattr(root, self.source or self.attname, None)
 
         resolver = getattr(self.parent, 'resolve_{}'.format(self.attname), None)
 
         # We try to get the resolver from the interfaces
-        if not resolver and issubclass(self.parent, ObjectType):
-            graphql_type = self.parent._meta.graphql_type
-            interfaces = graphql_type._provided_interfaces or []
-            for interface in interfaces:
-                if not isinstance(interface, GrapheneInterfaceType):
-                    continue
-                fields = interface.get_fields()
-                if self.attname in fields:
-                    resolver = getattr(interface.graphene_type, 'resolve_{}'.format(self.attname), None)
-                    if resolver:
-                        # We remove the bounding to the method
-                        resolver = resolver #.__func__
-                        break
+        # This is not needed anymore as Interfaces could be extended now with Python syntax
+        # if not resolver and issubclass(self.parent, ObjectType):
+        #     graphql_type = self.parent._meta.graphql_type
+        #     interfaces = graphql_type._provided_interfaces or []
+        #     for interface in interfaces:
+        #         if not isinstance(interface, GrapheneInterfaceType):
+        #             continue
+        #         fields = interface.get_fields()
+        #         if self.attname in fields:
+        #             resolver = getattr(interface.graphene_type, 'resolve_{}'.format(self.attname), None)
+        #             if resolver:
+        #                 # We remove the bounding to the method
+        #                 resolver = resolver #.__func__
+        #                 break
 
         if resolver:
             resolver = resolver.__func__
         else:
-            resolver = default_resolver
+            resolver = self.default_resolver
 
         # def resolver_wrapper(root, *args, **kwargs):
         #     if not isinstance(root, self.parent):

graphene/types/objecttype.py

@@ -1,10 +1,11 @@
+from itertools import chain
 import copy
 import six
 
 from graphql import GraphQLObjectType
 
 from .definitions import FieldsMeta, ClassTypeMeta, GrapheneGraphQLType
-from .interface import GrapheneInterfaceType
+from .interface import GrapheneInterfaceType, InterfaceTypeMeta, Interface
 
 
 class GrapheneObjectType(GrapheneGraphQLType, GraphQLObjectType):
@@ -45,7 +46,7 @@ def get_interfaces(cls, interfaces):
         yield graphql_type
 
 
-class ObjectTypeMeta(FieldsMeta, ClassTypeMeta):
+class ObjectTypeMeta(InterfaceTypeMeta):
 
     def get_options(cls, meta):
         return cls.options_class(
@@ -57,9 +58,19 @@ class ObjectTypeMeta(FieldsMeta, ClassTypeMeta):
             abstract=False
         )
 
+    def get_interfaces(cls, bases):
+        return (b for b in bases if issubclass(b, Interface))
+
+    def is_object_type(cls):
+        return issubclass(cls, ObjectType)
+
     def construct(cls, bases, attrs):
-        if not cls._meta.abstract:
-            interfaces = tuple(get_interfaces(cls, cls._meta.interfaces))
+        if not cls._meta.abstract and cls.is_object_type():
+            cls.get_interfaces(bases)
+            interfaces = tuple(get_interfaces(cls, chain(
+                cls._meta.interfaces,
+                cls.get_interfaces(bases),
+            )))
             local_fields = cls._extract_local_fields(attrs)
             if not cls._meta.graphql_type:
                 cls = super(ObjectTypeMeta, cls).construct(bases, attrs)

graphene/types/tests/test_objecttype.py

@@ -201,6 +201,25 @@ def test_objecttype_graphene_interface():
     assert fields['field'] > fields['extended'] > fields['name']
 
 
+def test_objecttype_graphene_inherit_interface():
+    class GrapheneInterface(Interface):
+        name = Field(GraphQLString)
+        extended = Field(GraphQLString)
+
+    class GrapheneObjectType(ObjectType, GrapheneInterface):
+        field = Field(GraphQLString)
+
+    graphql_type = GrapheneObjectType._meta.graphql_type
+    assert graphql_type.get_interfaces() == (GrapheneInterface._meta.graphql_type, )
+    assert graphql_type.is_type_of(GrapheneObjectType(), None, None)
+    fields = graphql_type.get_fields()
+    assert 'field' in fields
+    assert 'extended' in fields
+    assert 'name' in fields
+    assert issubclass(GrapheneObjectType, GrapheneInterface)
+    assert fields['field'] > fields['extended'] > fields['name']
+
+
 # def test_objecttype_graphene_interface_extended():
 #     class GrapheneInterface(Interface):
 #         field = Field(GraphQLString)