/**
  * Store a newly created resource in storage.
  *
  * @return Response
  */
 public function store(Request $request)
 {
     $this->validate($request, ['user_id' => 'required', 'book_id' => 'required']);
     $lend = new Lend();
     $lend->user_id = Input::get('user_id');
     $lend->book_id = Input::get('book_id');
     $lend_date = strtotime('today');
     $due_date = strtotime('+30 days', $lend_date);
     $lend->lend_date = $lend_date;
     $lend->due_date = $due_date;
     $lend->return_date = 0;
     $lend->continued = 0;
     $lend->is_returned = 0;
     if ($lend->save()) {
         return Redirect::to('admin/lends');
     } else {
         return Redirect::back()->withInput()->withErrors('fail to save!');
     }
     //
 }