/**
  * Jobs started in the current shift
  * @return mixed
  */
 public function currentShiftJobsStarted()
 {
     $jobsStartedIds = DB::table(LaminatingLogSheet::table())->select('job_cards_id')->groupBy('job_cards_id')->havingRaw('min(created_at) >= \'' . $this->current_shift->starting_time . '\'')->havingRaw('min(created_at) <= \'' . $this->current_shift->ending_time . '\'')->pluck('job_id_fk');
     return JobCard::find($jobsStartedIds);
 }