Laravel - Undefined offset 0 - collection.php

Question

我正在编写一个Web应用程序.后端是一个基于Laravel 4的RESTFul应用程序.

我遇到了特定控制器的问题.

BedsController.php

class BedsController extends \BaseController {

    /**
     * Display a listing of the resource.
     * GET /beds
     *
     * @return Response
     */
    public function index()
    {
        //
        $user = JWTAuth::parseToken()->authenticate();
        $data = Input::get('room');
        $retorno = array();
        $hoy = date('Y-m-d');
        if( $data ){
            $d = intval( $data );
            $beds = Bed::where('room', '=', $d )->get( array('size', 'room', 'id', 'name') );

            foreach( $beds as $b ){
                $b->stay = Stay::where('bed', '=', $b->id )
                            ->where('indate', '<=', $hoy )
                            ->where('outdate', '>=', $hoy )
                            ->get( array( 'id', 'room', 'bed', 'guest', 'booking', 'indate', 'outdate' ) );

                            dd( $b->stay );
                if( isset( $b->stay->guest ) ){
                    $b->stay->huesped = Guest::find( $b->stay->guest ); 
                }else{}

                if( isset( $b->stay->booking ) ){
                    $b->stay->huesped = Booking::find( $b->stay->booking ); 
                }

                //dd( $b->stay );

                array_push( $retorno, $b );
            }
            //$room = Room::find( $d );
            //return $room->camas()->get( 'size', 'room', 'id');
            //$beds = Bed::where('room', $data )->get();
        }else{
            $beds = Bed::where('hotel', '=', $user->hostel )->get( array('size', 'room', 'id', 'name') );   

            foreach( $beds as $b ){
                $be = $b['attributes'];
                $st = array();
                $stay = Stay::where('bed', '=', $b->id )
                            ->where('indate', '<=', $hoy )
                            ->where('outdate', '>=', $hoy )
                            ->get( array( 'id', 'room', 'bed', 'guest', 'booking', 'indate', 'outdate' ) );
                            //return $stay[0];

                $st = $stay[0];
                            //dd( $stay[0] );
                if( isset( $stay[0] ) ){
                    if( $stay[0]['attributes']['guest'] > 0 ){
                        $be['huesped'] = Guest::find( $b->stay->guest );
                    }else{}

                    if( $stay[0]['attributes']['booking'] ){
                        $be['reserva'] = Booking::find( $b->stay->booking );
                    }   
                    $be['stay'] = $st;
                }
                array_push( $retorno, $be);
                $be = array();
            }

        }
        return $retorno;

    }

因此,当我打电话给mysiteapp.local /床时,我应该拿回床上数据的复合数组,如果有预订,或者当时床被占用,那么住宿信息和客人的信息.

但我得到的是编译错误消息sayin':

error:{type: "ErrorException", message: "Undefined offset: 0",…}
file:"/home/pablo/htdocs/pbertran/angularh/api/vendor/laravel/framework/src/Illuminate/Support/Collection.php"
line:788
message:"Undefined offset: 0"
type:"ErrorException"

一直在谷歌搜索,但找不到任何解决方案.有任何想法吗？

提前致谢!

Answer 1

您对该索引存在进行了假设,但情况可能并非总是如此.你的逻辑应该更加苛刻:

$st = isset($stay[0]) ? $stay[0] : false;
if ($st){
    //now you can use it safely.
}