create valid relay schema.json

config/graphql/schema.js

@@ -0,0 +1,27 @@
+import {
+  GraphQLObjectType,
+  GraphQLSchema
+} from 'graphql';
+
+import {nodeField} from './node';
+import DB from './../database';
+
+export default function(){
+
+  var queryType = new GraphQLObjectType({
+    name: 'Query',
+    fields: () => ({
+      node: nodeField,
+      viewer: {
+        type: DB.User.graphql_type,
+        resolve: (_, args) => {
+          return DB.User.findOne({where: {username: args.username}});
+        }
+      },
+    }),
+  });
+
+  return new GraphQLSchema({
+    query: queryType
+  });
+}