如何迭代包含 Laravel 中数组的 collections 数组？

Question

我的 collection 使用以下查询实例化：$ClassesCollection = Classes::with('Queue')->whereIn('user_course_id', UserCourse::select('id')->where('user_id', $user->id))->get();

$ClassesCollection returns 想要的结果。但是，我只想要 Queue 结果。

所以我这样拆分

$classes = [];

    foreach($ClassesCollection as $class){
        array_push($classes, $class->Queue);
    }

现在我有一个 collection 的数组，每个数组都包含 Queue 的数组。

如何遍历这些 collection 以在我的视图中分别显示每个 Queue 数组的内容？

这就是 $classes 的内容

array:10 [▼
  0 => Collection {#968 ▼
    #items: array:12 [▼
      0 => Queue {#841 ▶}
      1 => Queue {#842 ▶}
      2 => Queue {#843 ▶}
      3 => Queue {#844 ▶}
      4 => Queue {#845 ▶}
      5 => Queue {#846 ▶}
      6 => Queue {#847 ▶}
      7 => Queue {#848 ▶}
      8 => Queue {#849 ▶}
      9 => Queue {#850 ▶}
      10 => Queue {#851 ▶}
      11 => Queue {#852 ▶}
    ]
  }
  1 => Collection {#969 ▶}
  2 => Collection {#970 ▶}
  3 => Collection {#971 ▶}
  4 => Collection {#972 ▶}
  5 => Collection {#973 ▶}
  6 => Collection {#974 ▶}
  7 => Collection {#975 ▶}
  8 => Collection {#976 ▶}
  9 => Collection {#977 ▶}
]

并且每个Queue都包含几个属性，例如date和class_id。那么如何显示每个Queue的内容呢？

编辑：我认为会有更简洁的方法，但这就是我为遇到此问题的任何人解决问题的方法。

$count = 0;
foreach($classes as $collection => $queue){
       /*$count = count($queue) - 1;
       for($i = 0; $i <= $count; $i++){
        echo $queue[$i]->date."\n";
       }*/
       foreach($queue as $Q){
        echo $Q->date."\n";
       }
}

注释掉的代码也达到了预期的效果

Answer 1

使用pluck():

$queues = $ClassesCollection->pluck('Queue')->flatten();

如何迭代包含 Laravel 中数组的 collections 数组？

How can I iterate over an array of collections containing arrays in Laravel?

arrays

eager-loading

eloquent

laravel-5.6

laravel-5.7