From c6e7562f7256672f4a7d278aea8cb6c3b74ce675 Mon Sep 17 00:00:00 2001
From: Sebastian Serth <Sebastian.Serth@hpi.de>
Date: Sat, 30 Sep 2023 18:15:25 +0200
Subject: [PATCH] Disallow matched users to wait for a Programming Group

Fixes CODEOCEAN-YE
---
 app/channels/pg_matching_channel.rb | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/app/channels/pg_matching_channel.rb b/app/channels/pg_matching_channel.rb
index 01ffa15f..a9d3189d 100644
--- a/app/channels/pg_matching_channel.rb
+++ b/app/channels/pg_matching_channel.rb
@@ -15,6 +15,12 @@ class PgMatchingChannel < ApplicationCable::Channel
   end
 
   def waiting_for_match
+    if (existing_programming_group = current_user.programming_groups.find_by(exercise: @exercise))
+      message = {action: 'joined_pg', users: existing_programming_group.users.map(&:to_page_context)}
+      ActionCable.server.broadcast(specific_channel, message)
+      return
+    end
+
     @current_waiting_user = PairProgrammingWaitingUser.find_or_initialize_by(user: current_user, exercise: @exercise)
     @current_waiting_user.status_waiting!