Add events for pair programming study

app/channels/application_cable/connection.rb

@@ -24,6 +24,7 @@ module ApplicationCable
     def find_verified_user
       # Finding the current_user is similar to the code used in application_controller.rb#current_user
       current_user = ExternalUser.find_by(id: session[:external_user_id]) || InternalUser.find_by(id: session[:user_id])
+      current_user&.store_current_study_group_id(session[:study_group_id])
       current_user || reject_unauthorized_connection
     end
 

app/channels/synchronized_editor_channel.rb

@@ -22,7 +22,10 @@ class SynchronizedEditorChannel < ApplicationCable::Channel
   end
 
   def send_changes(message)
-    ActionCable.server.broadcast(specific_channel, message['delta_with_user_id'])
+    change = message['delta_with_user_id'].deep_symbolize_keys
+
+    Event::SynchronizedEditor.create_for_editor_change(change, current_user, programming_group)
+    ActionCable.server.broadcast(specific_channel, change)
   end
 
   def send_hello