From 20df66f8f011d838d94034caa93278edd1e302de Mon Sep 17 00:00:00 2001
From: Magnus Hallin <mhallin@fastmail.com>
Date: Mon, 27 Feb 2017 21:15:13 +0100
Subject: [PATCH] Add fields to improve tooling compatibility

This adds some non-standard/deprecated fields to better work with
tools such as GraphiQL or GraphQLViz.
---
 src/schema/schema.rs | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/src/schema/schema.rs b/src/schema/schema.rs
index ad81cb62..748be235 100644
--- a/src/schema/schema.rs
+++ b/src/schema/schema.rs
@@ -44,6 +44,11 @@ graphql_object!(<'a> SchemaType<'a>: SchemaType<'a> as "__Schema" |&self| {
         self.mutation_type()
     }
 
+    // Included for compatibility with the introspection query in GraphQL.js
+    field subscription_type() -> Option<TypeType> {
+        None
+    }
+
     field directives() -> Vec<&DirectiveType> {
         self.directive_list()
     }
@@ -239,6 +244,26 @@ graphql_object!(<'a> DirectiveType<'a>: SchemaType<'a> as "__Directive" |&self|
     field args() -> &Vec<Argument> {
         &self.arguments
     }
+
+    // Included for compatibility with the introspection query in GraphQL.js
+    field deprecated "Use the locations array instead"
+    on_operation() -> bool {
+        self.locations.contains(&DirectiveLocation::Query)
+    }
+
+    // Included for compatibility with the introspection query in GraphQL.js
+    field deprecated "Use the locations array instead"
+    on_fragment() -> bool {
+        self.locations.contains(&DirectiveLocation::FragmentDefinition) ||
+            self.locations.contains(&DirectiveLocation::InlineFragment) ||
+            self.locations.contains(&DirectiveLocation::FragmentSpread)
+    }
+
+    // Included for compatibility with the introspection query in GraphQL.js
+    field deprecated "Use the locations array instead"
+    on_field() -> bool {
+        self.locations.contains(&DirectiveLocation::Field)
+    }
 });
 
 graphql_enum!(DirectiveLocation as "__DirectiveLocation" {