Laravel map():如何改变对象和数组?

时间:2016-01-15 09:22:29

标签: php dictionary collections laravel-4 eloquent

我有一个多维集合。我想迭代它并使用map()函数改变它的一些子对象和数组:https://laravel.com/docs/5.1/collections#method-map

示例内容:

[
    {
        'address': 'Somestreet 99'
        'orders': [
            {'id': 11},
            {'id': 67}
        ]
    }
]

实施例

  $deliveries = $delivery_addresses->map(function($delivery_address){
     $orders = $delivery_address->orders->filter(function($order){
        return $order->id == 67;
     });

     $delivery_address['address'] = 'A different street 44'
     $delivery_address['orders'] = $orders;
     $delivery_address['a_new_attribute'] = 'Some data...';

     return $delivery_address;
  });

预期结果:

[
    {
        'address': 'A different street 44'
        'orders': [
            {'id': 67}
        ],
        'a_new_attribute': 'Some data...;
    }
]

结果是只会更改字符串类型变量。任何数组或对象都将保持不变。这是为什么以及如何绕过它?谢谢! =)

3 个答案:

答案 0 :(得分:9)

collect($deliver_addresses)->map(function ($address) use ($input) {

    $address['id']              = $input['id'];
    $address['a_new_attribute'] = $input['a_new_attribute'];

    return $address;

});

答案 1 :(得分:5)

解决您最近的修改,请尝试以下方法:

$deliveries = $deliver_addresses->map(function($da) {
    $orders = $da->orders->filter(function($order) {
        return $order->id == 67;
    });

    $da->unused_attribute = $orders->all();

    return $da;
});

最有可能的情况是您正确覆盖该属性。然后,当您尝试访问它时,Laravel正在查询orders()关系并撤消您的更改。就Laravel而言,这些是相同的:

$delivery_address->orders;
$delivery_address['orders'];

这就是为什么更改仅适用于对象。如果你想永久保存它,那么实际保存它,如果不使用临时属性来包含那些数据。

答案 2 :(得分:1)

$paymentMethods = $user->paymentMethods()->map(function($paymentMethod){
            return $paymentMethod->asStripePaymentMethod();
        });