Question

我有一个yii2模型和关系 Yii2响应格式设置为JSON 我想用它的关系（一对多）返回模型，到目前为止一切都很好。

但是，在这种情况下，对于模型关系之一，JSON响应编码为JSON对象{}，而不是array []。我无法弄清楚究竟是为什么？对于其他关系，它是一个数组。

下面是模型的var_dump。有问题的关系是items

/backend/controllers/TasksController.php:181:
object(app\models\Task)[163]
  private '_attributes' (yii\db\BaseActiveRecord) => 
    array (size=6)
      'id' => int 9
      'title' => string 'Sample dnewsd' (length=13)
      'mode' => string 'onlyads' (length=7)
      'deployed' => int 0
      'start_time' => string '2017-11-16 00:00:00' (length=19)
      'end_time' => null
  private '_oldAttributes' (yii\db\BaseActiveRecord) => 
    array (size=6)
      'id' => int 9
      'title' => string 'Sample dnewsd' (length=13)
      'mode' => string 'onlyads' (length=7)
      'deployed' => int 0
      'start_time' => string '2017-11-16 00:00:00' (length=19)
      'end_time' => null
  private '_related' (yii\db\BaseActiveRecord) => 
    array (size=3)
      'items' => 
        array (size=2)
          0 => 
            object(app\models\TaskItem)[178]
              ...
          2 => 
            object(app\models\TaskItem)[201]
              ...
      'devices' => 
        array (size=0)
          empty
      'deviceGroups' => 
        array (size=0)
          empty

这是我编辑模型时的JSON返回：

{
    "status": "ok",
    "data": {
        "id": 9,
        "title": "Sample task",
        "mode": "onlyads",
        "deployed": 0,
        "start_time": "2017-11-16 00:00:00",
        "end_time": null,
        "items": {
            "0": {
                "id": 2,
                "image_url": "/media/lightboxes/pictures/ad_.jpg",
                "duration": 20,
                "task_id": 9
            },
            "2": {
                "id": 46,
                "image_url": "/media/lightboxes/pictures/ad_46.jpg",
                "duration": 20,
                "task_id": 9
            }
        },
        "devices": [],
        "deviceGroups": []
    }
}

您可以看到项目不是JSON数组：items : {}

在另一个操作中 - 获取相同的模型，返回的JSON具有items: []：

{
    "status": "ok",
    "data": {
        "id": 9,
        "title": "Sample dnewsd",
        "mode": "onlyads",
        "deployed": 0,
        "start_time": "2017-11-16 00:00:00",
        "end_time": null,
        "items": [
            {
                "id": 2,
                "image_url": "/media/lightboxes/pictures/ad_.jpg",
                "duration": 20,
                "task_id": 9
            },
            {
                "id": 46,
                "image_url": "/media/lightboxes/pictures/ad_46.jpg",
                "duration": 20,
                "task_id": 9
            }
        ],
        "devices": [],
        "deviceGroups": []
    }
}

以下是GET操作中相同模型的var_dump：

/srv/www/erp-ang/backend/controllers/TasksController.php:55:
object(app\models\Task)[163]
  private '_attributes' (yii\db\BaseActiveRecord) => 
    array (size=6)
      'id' => int 9
      'title' => string 'Sample dnewsd' (length=13)
      'mode' => string 'onlyads' (length=7)
      'deployed' => int 0
      'start_time' => string '2017-11-16 00:00:00' (length=19)
      'end_time' => null
  private '_oldAttributes' (yii\db\BaseActiveRecord) => 
    array (size=6)
      'id' => int 9
      'title' => string 'Sample dnewsd' (length=13)
      'mode' => string 'onlyads' (length=7)
      'deployed' => int 0
      'start_time' => string '2017-11-16 00:00:00' (length=19)
      'end_time' => null
  private '_related' (yii\db\BaseActiveRecord) => 
    array (size=3)
      'items' => 
        array (size=2)
          0 => 
            object(app\models\TaskItem)[178]
              ...
          1 => 
            object(app\models\TaskItem)[184]
              ...
      'devices' => 
        array (size=0)
          empty
      'deviceGroups' => 
        array (size=0)
          empty

任何线索为什么会发生这种情况？

Answer 1

数组需要有从0开始的连续索引，
如果你需要重新索引已加载的关系，你可以运行

$task->populateRelation('items', array_values($task->items));

Yii2 json响应将数组转换为JSON对象，而不是json数组

1 个答案: