/**
  * Update the specified resource in storage.
  *
  * @param  int  $id
  * @return Response
  */
 public function update($id, Request $request)
 {
     $assign = assign::findOrFail($id);
     $assign->update($request->all());
     Session::flash('flash_message', 'assign successfully updated!');
     return redirect('assign');
 }