Laravel 计数不起作用，有任何支持吗？

Question

我正在尝试在 api 上输出用户详细信息我正在使用 laravel 6 但count给了我意想不到的输出可能是它没有醒来所以我不知道任何人都可以提供帮助    public function userDetails(User $user, Request $req){        $user = $user->find($req->username);        if(empty($user))//check if user exists            return response()->json(["msg"=>"No user found "],404);        $user->profile = empty($user->profile) ? "" : $user->profile->file;        $user->downloads = empty($user->downloads) ? 0 : $user->downloads->count('id');        $user->likes = empty($user->likes) ? 0 : $user->likes->count();        $user->reads = empty($user->reads) ? 0 : $user->reads->count();        $user->dislikes = empty($user->dislikes) ? 0 : $user->dislikes->count();        return response()->json($user, 200);    }输出{"username": "liberi","firstName": null,"secondName": null,"gender": null,"phone": "0987654321","email": "[e-mail]","created_at": "2020-05-12 21:48:33","updated_at": "2020-05-12 21:48:33","email_verified_at": null,"phone_verified_at": null,"profile": null,"downloads": [],"likes": [   {      "id": 1,      "book_ISBN": "09876543236",      "user_username": "liberi",      "created_at": null,      "updated_at": null   },  {     "id": 2,     "book_ISBN": "09876543236",     "user_username": "liberi",    "created_at": null,   "updated_at": null  }],"reads": [],"dislikes": []}预期输出{"username": "liberi","firstName": null,"secondName": null,"gender": null,"phone": "0987654321","email": "[e-mail]","created_at": "2020-05-12 21:48:33","updated_at": "2020-05-12 21:48:33","email_verified_at": null,"phone_verified_at": null,"profile": null,"downloads": 0,"likes": 2,"reads": 0,"dislikes": 0}

Answer 1

通过在关系上添加括号，您可能会发现使用查询构建器获取计数而不是关系/集合更容易。你甚至可以跳过三元组。

$user->downloads = $user->downloads()->count('id');

$user->likes = $user->likes()->count();

$user->reads = $user->reads()->count();

$user->dislikes = $user->dislikes()->count();

Answer 2

我建议使用withCount(). 检查文档

$user = User::find($req->username)->withCount('likes')->get();
$user->likes_count // this will give you user's like count