嵌套集保存到数据库

Question

我正在尝试使用 Laravel 应用程序实现 jqTree。

控制器获取数据和return视图：

public function index()
{
    $categories = Category::get(['id', 'name', '_lft', '_rgt', 'parent_id'])->toTree();
    return view('category.index', [
        'categories' => $categories
    ]);
}

这是一个视图（javascript部分）：

var data = {!! $categories !!};

$('#tree').tree({
        data: data,
        dragAndDrop: true,
        onDragStop: handleMove,
});

function handleMove() {
    var treeData = $('#tree').tree('toJson');

$.ajax({
    url: 'category',
    type: 'POST',
    headers: { 'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content') },
    data: { data: treeData },
});


}

这正确地构建了树，我可以拖放项目。但是，我想将重新排序的树保存回数据库。这是控制器中的 post 方法：
```
public function store(Request $request)
{
  $data = $request->data;
  $result = Category::rebuildTree($data);
  ...
}
```

调用 rebuildTree 方法后，出现此错误：

Type error: Argument 1 passed to Kalnoy\Nestedset\QueryBuilder::rebuildTree() must be of the type array, string given

我试过这个：

public function store(Request $request)
{
  $data = $request->data;
  $data = json_decode($request->data);
  $array_data = (array) $data;
  $result = Category::rebuildTree($data);
  ...
}

这可是 returns:

Cannot use object of type stdClass as array

如何获取传递的数据数组以便我可以使用 rebuildTree() 方法并更新数据库？

这是 dd($request->data):

的结果

[{"name":"Storage","id":3,"_lft":17,"_rgt":18,"parent_id":null,"is_open":true,
    "children":[{"name":"Laptops","id":1,"_lft":1,"_rgt":10,"parent_id":null,"is_open":true,
    "children":[{"name":"Monitors","id":2,"_lft":11,"_rgt":16,"parent_id":null,
    "children":[{"name":"IPS","id":5,"_lft":14,"_rgt":15,"parent_id":2}]},
    {"name":"Macbook","id":6,"_lft":2,"_rgt":3,"parent_id":1},
    {"name":"Acer","id":7,"_lft":4,"_rgt":5,"parent_id":1},
    {"name":"New Subcategory Name","id":8,"_lft":6,"_rgt":7,"parent_id":1},
    {"name":"New Subcategory ame","id":9,"_lft":8,"_rgt":9,"parent_id":1}]}]},
    {"name":"Memory","id":4,"_lft":19,"_rgt":20,"parent_id":null}]

此外，需要说明的是：我正在使用 jqTree

嵌套集是lazychaser/laravel-nestedset

Answer 1

您在 $request->data; 中得到 json 您需要使用 json_decode() 以及第二个参数作为 assoc

的 true 在数组中对其进行解码

see the manual

assoc

When TRUE, returned objects will be converted into associative arrays.

public function store(Request $request)
{
  $result = Category::rebuildTree(json_decode($request->data,True));
  ...
}

如果你需要在$data中传递它，那么就这样传递。

$data = json_decode($request->data,True);

或者

foreach ($request->data as $value) 
    $array[] = $value->name;

然后像这样将此 $array 传递到您的查询中

$result = Category::rebuildTree($array);

嵌套集保存到数据库

nested set save to database

ajax

nested-sets

laravel

jqtree