Stop requiring get_node in implemented Nodes

graphene/relay/node.py

@@ -89,7 +89,9 @@ class Node(six.with_metaclass(NodeMeta, Interface)):
             assert cls in graphene_type._meta.interfaces
         except:
             return None
-        return graphene_type.get_node(_id, context, info)
+        get_node = getattr(graphene_type, 'get_node', None)
+        if get_node:
+            return get_node(_id, context, info)
 
     @classmethod
     def from_global_id(cls, global_id):
@@ -101,13 +103,8 @@ class Node(six.with_metaclass(NodeMeta, Interface)):
 
     @classmethod
     def implements(cls, objecttype):
-        require_get_node = cls.get_node_from_global_id == Node.get_node_from_global_id
         get_connection = getattr(objecttype, 'get_connection', None)
         if not get_connection:
             get_connection = partial(get_default_connection, objecttype)
 
         objecttype.Connection = get_connection()
-        if require_get_node:
-            assert hasattr(objecttype, 'get_node'), (
-                '{}.get_node method is required by the Node interface.'
-            ).format(objecttype.__name__)

graphene/relay/tests/test_connection.py

@@ -10,10 +10,6 @@ class MyObject(ObjectType):
         interfaces = [Node]
     field = String()
 
-    @classmethod
-    def get_node(cls, id):
-        pass
-
 
 def test_connection():
     class MyObjectConnection(Connection):

graphene/relay/tests/test_connection_query.py

@@ -11,10 +11,8 @@ letter_chars = ['A', 'B', 'C', 'D', 'E']
 class Letter(ObjectType):
     class Meta:
         interfaces = (Node, )
-    letter = String()
 
-    def get_node(*args, **kwargs):
-        pass
+    letter = String()
 
 
 class Query(ObjectType):

graphene/relay/tests/test_node.py

@@ -49,26 +49,6 @@ class RootQuery(ObjectType):
 schema = Schema(query=RootQuery, types=[MyNode, MyOtherNode])
 
 
-def test_node_no_get_node():
-    with pytest.raises(AssertionError) as excinfo:
-        class MyNode(ObjectType):
-
-            class Meta:
-                interfaces = (Node, )
-
-    assert "MyNode.get_node method is required by the Node interface." == str(excinfo.value)
-
-
-def test_node_no_get_node_with_meta():
-    with pytest.raises(AssertionError) as excinfo:
-        class MyNode(ObjectType):
-
-            class Meta:
-                interfaces = (Node, )
-
-    assert "MyNode.get_node method is required by the Node interface." == str(excinfo.value)
-
-
 def test_node_good():
     assert 'id' in MyNode._meta.fields