Laravel：使用 where inside（带模型）

Question

我有这个 Controller：

public function user_predects()
{
    $matches=Match::with('Predect')->get();
    return ($matches);
}

它得到 json 数据，如下所示：

[
    {
        "id": 1,
        "m_date": "2021-02-06 22:00:00",
        "home": "Turkey",
        "away": "Italy",
        "h_goals": 0,
        "a_goals": 0,
        "predect": [
          {
            "id": 3,
            "user_id": 10,
            "match_id": 1,
            "h_predect": 1,
            "a_predect": 1,
            "player_id": 1,
            "point": 0,
            "created_at": null,
            "updated_at": null
          },
          {
            "id": 4,
            "user_id": 9,
            "match_id": 1,
            "h_predect": 2,
            "a_predect": 1,
            "player_id": 1,
            "point": 0,
            "created_at": null,
            "updated_at": null

现在我想查看相同的 json 数据，但只针对一个用户，我使用了这个但不起作用：

public function user_predects($username)
{
    $user = User::where('username',$username)->get()
    $matches=Match::with('Predect')->where('Predect.user_id',$user[0]->id)->get();

    return ($matches);
}

如何查看一个用户的匹配 model 和预测 model？

Answer 1

试试这个：

public function user_predects($username)
{
    $user = User::where('username',$username)->first()
    $matches = Match::with(['Predect' => function($query) use ($user) {
        return $query->where('Predect.user_id', $user->id);
    }])->get();

    return ($matches);
}

您还可以从官方文档中阅读有关约束 Eager Loading 的信息： Constraining Eager Loads