php - Invalid argument supplied for foreach() Laravel 5.3 -

i have 2 table(interview , interviewtrack) in 1 form.

here's savehandler code far :

public function savehandler(request $request, $obj) {     try {         db::begintransaction();         $obj->fill($request->all());         if (!$obj->save()) {             throw new validationexception($obj->errors());         }             foreach($request->interviewtracks $interviewtrack) {                 \log::info($interviewtrack);                 if (empty($interviewtrack['id'])) {                     $interviewtrack = new interviewtrack();                 }                 else {                     $interviewtrack = interviewtrack::find($interviewtrack['id']);                 }                 $interviewtrack->interview()->associate($obj);                 $interviewtrack['interview_id'] = isset($interviewtrack['interview_id']);                 $interviewtrack->status = $interviewtrack['status'];                 $interviewtrack->track_date = isset($interviewtrack['track_date']) ? $interviewtrack['start_time'] : 'yyyy-mm-dd';                 $interviewtrack->outcome = $interviewtrack['outcome'];                 $interviewtrack->remarks = $interviewtrack['remarks'];                 $interviewtrack->save();             };             if (!$interviewtrack->save()) {                 throw new validationexception($interviewtrack->errors());             }          db::commit();         return $this->sendsuccessresponse($request);     } catch (validationexception $e) {         db::rollback();         \log::error($e->errors);         return $this->senderrorresponse($request, $e->errors);     } catch (exception $e) {         db::rollback();         \log::error($e->getmessage());         return $this->senderrorresponse($request,'unable process. please contact system administrator');     }  } 

here's view form code :

<?php $index = 0; ?>  <?php echo form::hidden('interviewtracks['.$index.'][id]', null); ?>  <div class="row">     <div class="col-md-4">         <div class="form-group">             <label class="control-label">track date</label>             <?php echo form::text('interviewtracks['.$index.'][track_date]', null, ['id' => 'track_date','class' => 'form-control']); ?>          </div>     </div>     <div class="col-md-4">         <div class="form-group">             <label class="control-label">status</label>             <?php echo form::select('interviewtracks['.$index.'][status]', $interviewtracklist, null, ['id' => 'status','class' => 'form-control']); ?>          </div>     </div>     <div class="col-md-4">         <div class="form-group">             <label class="control-label">outcome</label>             <?php echo form::select('interviewtracks['.$index.'][outcome]', $outcomelist, null, ['id' => 'outcome','class' => 'form-control']); ?>          </div>     </div>     <div class="col-md-12">         <div class="form-group">             <label class="control-label">remark</label>             <?php echo form::text('interviewtracks['.$index.'][remark]', null, ['id' => 'remarks','class' => 'form-control']); ?>          </div>     </div> </div> <?php $index++; ?> 

it throws error invalid argument supplied foreach() when try save. idea ??

change:

foreach($request->interviewtracks $interviewtrack)

to:

foreach($request->input('interviewtracks') $interviewtrack)