Add the third 'invalid' attribute to ExecutionResult for distingushing invalid query (fix #52)

Author: dittos

graphql/core/execution/base.py

@@ -66,9 +66,12 @@ class ExecutionResult(object):
     query, `errors` is null if no errors occurred, and is a
     non-empty array if an error occurred."""
 
-    def __init__(self, data, errors=None):
+    def __init__(self, data, errors=None, invalid=False):
         self.data = data
         self.errors = errors
+        if invalid:
+            assert data is None
+        self.invalid = invalid
 
 
 def get_operation_root_type(schema, operation):

graphql/core/execution/executor.py

@@ -51,8 +51,8 @@ def _execute(self, request, root, args, operation_name, request_context, execute
             validation_errors = validate(self.schema, request)
             if validation_errors:
                 return succeed(ExecutionResult(
-                    data=None,
                     errors=validation_errors,
+                    invalid=True,
                 ))
 
         return self._execute_graphql_query(