php - How to update insert data in laravel 5.2 -

i need if , else function insert record , again update same record in drop , down input. blade view

<input type="hidden" id="cid" name="cid" value="{{ $collaborator->user()->first()->id }}" />                     <div class="form-group{{ $errors->has('status') ? ' has-error' : '' }}">                     <label for="status" class="control-label">choose permission</label>                     <select name="status" id="status">                     <option value="">choose status</option>                     <option value="3">view only</option>                     <option value="2">edit tasks</option>                     <option value="1">admin</option>                     </select>  

my controller saving new record

public function addpermission(request $request, $id,  permission $permission)     {          $this->validate($request, [             'status'   => 'required'           ]);          $permission = new permission;          $permission->status = $request->input('status');         $permission->project_id       = $id;         $permission->collaborator_id =  $request->input('cid');         $permission->save();         return redirect()->back()->with('info','permission has been added   collaborator successfully'); } 

i need update function here