Illuminate\Database\Query\Builder::find PHP Method

    public function find($id, $columns = ['*'])
    {
        return $this->where('id', '=', $id)->first($columns);
    }

 /**
  * Find notification by id
  *
  * @param $notification_id
  * @return \Illuminate\Database\Eloquent\Collection|\Illuminate\Database\Eloquent\Model|static
  */
 public function find($notification_id)
 {
     return $this->notification->find($notification_id);
 }