Question

在比较两个日期时，我遇到了从数据库中检索一些数据的奇怪问题。

数据库结构：用户，预订，reservation_services，services_price_history

基于以上表格：用户有很多预订，预订有很多服务，服务有很多价格历史。

我需要预订所有用户，然后根据预订日期查找服务价格。

问题在于，当我添加日期比较条件时，它没有考虑到它

代码：

$users = User::with(['reservations' => function($query) use ($department_id, $date_start, $date_end) {

    // reservation services
    $query->with(['reservation_services' => function($query) {
        $query->join('reservations', 'reservation_services.reservation_id', 'reservations.id');
        $query->join('services', 'reservation_services.service_id', 'services.id');

        // Find the service price based on reservation date
        $query->join('services_price_history', function($query) {
            $query->on('reservations.salon_id', 'services_price_history.salon_id');
            $query->on('reservation_services.service_id', 'services_price_history.service_id');

            // this shoud be the condition that gives us the correct
            // price based on the reservation date
            $query->where('services_price_history.date_start', '<', 'reservations.date');
           // then we use order and limit 1
        });

        $query->select(
            'reservation_services.reservation_id',
            'reservation_services.service_id',
            'reservation_services.quantity',
            'services_price_history.price',
            'services_price_history.date_start',
            'services.name',
            DB::raw('(services_price_history.price * reservation_services.quantity) as total')
        );
        $query->orderBy('services_price_history.id', 'desc');
    }]);
}])->get();

这是输出：

[
   {
      "id":10,
      "first_name":"Mihaela",
      "last_name":"Radulescu",
      "reservations":[
         {
            "id":112,
            "salon_id":2,
            "client_id":161,
            "user_id":10,
            "date":"2017-10-31", // the reservation date
            "start":"10:00",
            "end":"12:00",
            "state_id":5,
            "notes":null,
            "price":"350.00",
            "reservation_services":[
               {
                  "reservation_id":112,
                  "service_id":89,
                  "quantity":1,
                  "price":"400.00",
                  "date_start":"2017-11-02", // this is wrong
                  "name":"Tratament ANTI AGE",
                  "total":"400.00"
               },
               {
                  "reservation_id":112,
                  "service_id":89,
                  "quantity":1,
                  "price":"350.00",
                  "date_start":"2017-10-19", // this is ok
                  "name":"Tratament ANTI AGE",
                  "total":"350.00"
               }
            ],
            "reservation_products":[

            ]
         },
      ]
   },
],

我真的不知道为什么但是这行代码

$query->where('services_price_history.date_start', '<', 'reservations.date');

因为'2017-11-02'高于'2017-10-31'但显示在结果中而无法正常工作。

非常感谢。

Answer 1

而不是：

$query->where('services_price_history.date_start', '<', 'reservations.date');

使用：

$query->whereRaw('services_price_history.date_start < reservations.date');

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