class SetTopicAuthorsAsWatchers < ActiveRecord::Migration[4.2] def self.up # Sets active users who created/replied a topic as watchers of the topic # so that the new watch functionality at topic level doesn't affect notifications behaviour Message.connection.execute("INSERT INTO #{Watcher.table_name} (watchable_type, watchable_id, user_id)" + " SELECT DISTINCT 'Message', COALESCE(m.parent_id, m.id), m.author_id" + " FROM #{Message.table_name} m, #{User.table_name} u" + " WHERE m.author_id = u.id AND u.status = 1") end def self.down # Removes all message watchers Watcher.where("watchable_type = 'Message'").delete_all end end