Laravel 8预订日历报错：Target class [FrontendController]不存在

错误详情 #

点击「预订」按钮后触发以下错误：

Illuminate\Contracts\Container\BindingResolutionException
Target class [FrontendController] does not exist.

请求地址：http://localhost/testowa7/public/makeReservation/26/5

相关代码 #

Room Blade 视图代码 #

<form action="{{ route('makeReservation',['room_id'=>$room->id,'city_id'=>$room->object->city->id]) }}" method="POST">
    <div class="form-group">
        <label for="dayin">入住日期</label>
        <input required name="dayin" type="text" class="form-control datepicker" id="dayin" placeholder="">
    </div>
    <div class="form-group">
        <label for="dayout">退房日期</label>
        <input required name="dayout" type="text" class="form-control datepicker" id="dayout" placeholder="">
    </div>
    <button type="submit" class="btn btn-primary">预订</button>
    <p class="text-danger">{{ Session::get('reservationMsg') }}</p>
    {{ csrf_field() }}
</form>

路由代码 #

Route::post('/makeReservation/{room_id}/{city_id}','FrontendController@makeReservation')->name('makeReservation');

FrontendController 代码 #

public function makeReservation($room_id, $city_id, Request $request)
{
    $avaiable = $this->fG->checkAvaiableReservations($room_id,$request);

    if(!$avaiable)
    {
        if(!$request->ajax())  // 非APP环境下使用
        {
            $request->session()->flash('reservationMsg',_('无可用房间'));
            return redirect()->route('room',['id'=>$room_id,'#reservation']);
        }

        return response()->json(['reservation'=>false]);  // APP环境下使用

    }
    else
    {
        $reservation = $this->fG->makeReservation($room_id,$city_id,$request);

        if(!$request->ajax())
            return redirect()->route('adminHome');
        else
            return response()->json(['reservation'=>$reservation]);

    }
    
}

FrontendRepository 代码 #

public function makeReservation($room_id, $city_id, $request)
{
    return Reservation::create([
        'user_id' => $request->user()->id,
        'city_id' => $city_id,
        'room_id' => $room_id,
        'status' => 0,
        'dayin' => $request->input('dayin'),
        'dayout' => $request->input('dayout'),
    ]);
}

FrontendGateway 代码 #

public function checkAvaiableReservations($room_id,$request)
{
    $reservations = $this->fR->getReservationsByRoomId($room_id);

    $avaiable = true;

    foreach($reservations as $reservation)
    {
        if( $request->input('dayin') >= $reservation->day_in
          && $request->input('dayin') <= $reservation->day_out
        )
        {
            $avaiable =false;break;
        }
        elseif( $request->input('dayout') >= $reservation->day_in
          && $request->input('dayout') <= $reservation->day_out
        )
        {
            $avaiable =false;break;
        }
        if( $request->input('dayin') >= $reservation->day_in
          && $request->input('dayout') <= $reservation->day_out
        )
        {
            $avaiable =false;break;
        }
    }

    return $avaiable;
}

public function makeReservation($room_id, $city_id, $request)
{
    $this->validate($request, [
        'dayin' => "required|string",
        'dayout' => "required|string",
    ]);

    return $this->fR->makeReservation($room_id, $city_id, $request);
}

解决方案 #

Laravel 8 取消了路由默认的控制器命名空间，直接用'FrontendController@makeReservation'这种字符串写法会找不到类，可通过以下两种方式解决：

1. 使用完全限定类名
   确认FrontendController的命名空间（通常为App\Http\Controllers），修改路由代码：

   use App\Http\Controllers\FrontendController;
   
   Route::post('/makeReservation/{room_id}/{city_id}', [FrontendController::class, 'makeReservation'])->name('makeReservation');
   

2. 恢复默认命名空间
   在app/Providers/RouteServiceProvider.php中取消注释protected $namespace = 'App\\Http\\Controllers';，然后在路由文件中用命名空间分组包裹路由：

   // RouteServiceProvider.php中
   protected $namespace = 'App\\Http\\Controllers';
   
   // 对应路由文件中
   Route::group(['namespace' => $this->namespace], function () {
       Route::post('/makeReservation/{room_id}/{city_id}','FrontendController@makeReservation')->name('makeReservation');
       // 其他路由...
   });
   

额外检查：确认FrontendController文件放在app/Http/Controllers目录下，类名与文件名大小写一致（Laravel对类名大小写敏感）。

内容的提问来源于stack exchange，提问作者Weronika Piotrowicz