Laravel 具有轴心和嵌套子项的Eloquent sync（）属于

我想解决这个问题。我得到了这样一个json：

[
  {
    "id": 2,
    "title": "One",
    "parent": {},
    "children": [
      {
        "id": 3,
        "title": "One One",
        "parent": {
          "id": 2,
          "title": "One"
        },
        "children": [],
        "value": 1
      },
      {
        "id": 4,
        "title": "One Two",
        "parent": {
          "id": 2,
          "title": "One"
        },
        "children": [],
        "value": 2
      }
    ],
    "value": 3
  },
  {
    "id": 5,
    "title": "Three",
    "value": 3
  }
]

/*Save items*/
$items
    = collect($request->input('data.items'))->mapWithKeys(function (
    $item
) {
    $traverse = function ($item) use (&$traverse) {
        if (array_key_exists('value', $item)) {
            $value = $item['value'];
        } else {
            $value = null;
        }

        foreach ($item['children'] as $child) {
            $child = $traverse($child);
        }

        $children = ($item['children']);

        return [
            $item['id'] => compact('value', 'children'),
        ];
    };

    $item = $traverse($item);

如您所见，每个项目都可以有一个子项，也可以有一个子项，也可以有一个子项，以此类推。它是嵌套的

现在，我想将这些项和每个子项保存在与pivot的归属关系中，在本例中为：value。如果要使用同步，我必须在控制器中准备所有项目：

 <?php

/*Save $items*/
$items
    = collect($request->input('data.items'))->mapWithKeys(function (
    $item
) {

    if (array_key_exists('value', $item)) {
        $value = $item['value'];
    } else {
        $value = null;
    }

    return [
        $item['id'] => compact('value'),
    ];
});

$user->items()->sync($items);

但这并不可行

因此，我想要的是：

将每个项目保存为具有pivot值的用户的归属关系 使用pivot值递归保存所有子项

---

首先我想说的是，您的数据实际上是JSON，而不是数组。所以这里我写了一些代码，你们可以看到我解码了，从循环函数开始得到了一个数组

protected $result = [];

protected function deepDiveIntoNextLevel(array $array) {
    foreach ($array as $item) {
        $this->result[] = $item['value'];
        if(!empty($item['children'])) {
            $this->deepDiveIntoNextLevel($item['children']);
        }
    }
}

public function loop()
{
    $json_array = '[
      {
        "id": 2,
        "title": "One",
        "parent": {},
        "children": [
          {
            "id": 3,
            "title": "One One",
            "parent": {
              "id": 2,
              "title": "One"
            },
            "children": [],
            "value": 1
          },
          {
            "id": 4,
            "title": "One Two",
            "parent": {
              "id": 2,
              "title": "One"
            },
            "children": [],
            "value": 2
          }
        ],
        "value": 3
      },
      {
        "id": 5,
        "title": "Three",
        "value": 3
      }
    ]';
    $initial_array = json_decode($json_array, true);

    $this->deepDiveIntoNextLevel($initial_array);
    $result = $this->result;
    // As output you may get an array, where you can have duplicates
    sort($result);
    // Or it can be not ordered
    $relations_ids_odered = array_unique($result);
}

据我所知，您希望将所有项值收集到一个数组中，该数组将用于保存一个用户的所有关系。因此，您可以让输出数组看到循环函数的底部

protected $result = [];

protected function deepDiveIntoNextLevel(array $array) {
    foreach ($array as $item) {
        $this->result[] = $item['value'];
        if(!empty($item['children'])) {
            $this->deepDiveIntoNextLevel($item['children']);
        }
    }
}

public function loop()
{
    $json_array = '[
      {
        "id": 2,
        "title": "One",
        "parent": {},
        "children": [
          {
            "id": 3,
            "title": "One One",
            "parent": {
              "id": 2,
              "title": "One"
            },
            "children": [],
            "value": 1
          },
          {
            "id": 4,
            "title": "One Two",
            "parent": {
              "id": 2,
              "title": "One"
            },
            "children": [],
            "value": 2
          }
        ],
        "value": 3
      },
      {
        "id": 5,
        "title": "Three",
        "value": 3
      }
    ]';
    $initial_array = json_decode($json_array, true);

    $this->deepDiveIntoNextLevel($initial_array);
    $result = $this->result;
    // As output you may get an array, where you can have duplicates
    sort($result);
    // Or it can be not ordered
    $relations_ids_odered = array_unique($result);
}

---

结果你想要什么？请写下这一点，以便那些愿意提供帮助的人更容易阅读；对不起，我添加了丢失的信息，