App\Models\Forum\TopicWatch::add PHP Метод

    public static function add($topic, $user)
    {
        try {
            return static::create(['topic_id' => $topic->topic_id, 'user_id' => $user->user_id]);
        } catch (QueryException $ex) {
            // Do nothing if already watching. Rethrow everything else.
            if (!is_sql_unique_exception($ex)) {
                throw $ex;
            }
        }
    }