php - how to perform this join in laravel -

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i have table in database called jobcardops , model jobcardop.php. fields of table include opnum, jobcardnum, prevopnum, opstatus. row uniquely identified jobcardnum , opnum pair. now, considered having field called previousopstatus contains status of previous op, wondered whether join.

so clarify, when retrieve group of jobcardop models database want add field on end; 'previousopstatus'. know ill need like;

 $ops = jobcardop::where('jobcardnum', '=', $somejobnum)   ->join('jobcardops jobcardops_1, constraint)   ->select('jobcardops.*', 'jobcardops_1.opstatus previousopstatus')   ->get();

where jobcardops_1 somehow offset 1 if makes sense. can if can done?

thanks


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