Add previous username to notification

graph/mutators/user.js

@@ -57,7 +57,8 @@ const stopIgnoringUser = ({ user }, userToStopIgnoring) => {
 
 const changeUsername = async (ctx, id, username) => {
   const user = await UsersService.changeUsername(id, username, ctx.user.id);
-  ctx.pubsub.publish('usernameChanged', user);
+  const previousUsername = ctx.user.username;
+  ctx.pubsub.publish('usernameChanged', { previousUsername, user });
   return user;
 };
 

graph/setupFunctions.js

@@ -129,7 +129,7 @@ const setupFunctions = {
     }
     return !args.user_id || user.id === args.user_id;
   },
-  usernameChanged: (options, args, user, context) => {
+  usernameChanged: (options, args, { user }, context) => {
     if (
       !context.user ||
       (args.user_id !== user.id &&

graph/typeDefs.graphql

@@ -1465,6 +1465,11 @@ type RootMutation {
   stopIgnoringUser(id: ID!): StopIgnoringUserResponse
 }
 
+type UsernameChangedPayload {
+  previousUsername: String
+  user: User
+}
+
 ################################################################################
 ## Subscriptions
 ################################################################################
@@ -1522,7 +1527,7 @@ type Subscription {
 
   # Get an update whenever a username has been changed. `user_id` must match id
   # of current user except for users with the `ADMIN` or `MODERATOR` role.
-  usernameChanged(user_id: ID): User
+  usernameChanged(user_id: ID): UsernameChangedPayload
 }
 
 ################################################################################