jquery - 由于 AJAX 请求，Laravel 集合排序无效

Question

当我尝试通过默认的 sort() 函数对 Laravel 集合进行排序时 - 我得到了正确的排序。但是，当我尝试通过 Ajax 获取此数据时，我从 Ajax 响应中得到了无效的排序。

例如:

 $a = collect([
         '2019-01-10', 
         '2019-01-01', 
         '2019-01-24', 
         '2019-01-03', 
         '2019-01-02'
        ])->sort();

Laravel dd($a) 给了我正确的排序:

Collection {#508
  #items: array:5 [
    1 => "2019-01-01"
    4 => "2019-01-02"
    3 => "2019-01-03"
    0 => "2019-01-10"
    2 => "2019-01-24"
  ]
}

但是当我尝试为 jQuery Ajax 请求返回此数据时:

return response()->json([$a]);

ajax响应的

console.log():

0: "2019-01-10"
1: "2019-01-01"
2: "2019-01-24"
3: "2019-01-03"
4: "2019-01-02" 

订单无效

更新
我有比示例更复杂的数据:
首先，我得到了项目列表:

$projects = DB::table('projects')
        ->whereIn(DB::raw("DATE_FORMAT(created_at, '%Y-%m-%d')"), $dates)
        ->orderBy('created_at', 'DESC')
        ->get();

接下来我按created_at分组:

$data = $projects->groupBy(function ($project) {
        return Carbon::parse($project->created_at)->format('Y-m-d');
    })->sortKeysDesc(); //<----- sort to display newest first

所以我的结果数组排序正确，看起来像:

[
'2019-01-20' => [...] nested arrays
'2019-01-15' => [...] nested arrays
'2019-01-10' => [...] nested arrays
]

但是 JS 从 Ajax 返回:

 [
 '2019-01-10' => [...] nested arrays
 '2019-01-15' => [...] nested arrays
 '2019-01-20' => [...] nested arrays
 ]

Answer 1

尝试下面的代码:

$items = array_values($a->toArray());
return response()->json([$items]);