如何同时查询多条主记录的涉外关系数据

Question

我有一个关系Room。每个房间有一个所有者，是 User 个实体，每个 Room 有多个参与者，也是 User 个实体。

当页面加载时，我在 React 中查询所有房间

一旦所有的房间都被 return 回传，我用每个房间的 ID 一个一个地查询数据库，以取回存储在其他关系中的房间的详细信息（房间所有者、房间用户数、属于实体 Topic)

的房间主题

  const fetchRooms = () => {
    const csrf: HTMLMetaElement = document.querySelector(
      "meta[name='csrf-token']"
    ) as HTMLMetaElement;
    axios
      .post(
        `/room/all/${pageNumber}`,
        {},
        {
          headers: {
            "Content-type": "application/json",
            "X-CSRF-TOKEN": csrf.content,
          },
        }
      )
      .then((response) => {
        const data = response.data;
        data.forEach((room: any) => {
          //! TODO: merge each rooms details with its own data to avoid extra requests
          axios
            .post(
              "/room/details",
              { id: room.id },
              {
                headers: {
                  "Content-type": "application/json",
                  "X-CSRF-TOKEN": csrf.content,
                },
              }
            )
            .then(({ data }) => {
              if (data) {
                setRooms((rooms) => [
                  ...rooms,
                  <RoomCard
                    key={room.id}
                    id={room.id}
                    title={room.name}
                    img={null}
                    username={data.owner.username}
                    timestamp={room.created_at}
                    userCount={data.user_count}
                    topic={data.topic.name}
                  />,
                ]);
              }
            });
        });
      })
      .catch(({ response }) => {
        console.log(response.status, response.data);
      });
  };

laravel 处理

// web.php
Route::controller(RoomController::class)->group(function () {
    Route::post("room/all/{page:int}", "all")->name("rooms.all");
    Route::post("room/details", "details")->name("rooms.details");
}

// RoomController.php
    public function all(Request $request, $page = 1)
    {
        if (!Auth::check()) {
            return response("", 403);
        }

        $total_posts = 20;

        $rooms = Room::offset(($page - 1) * $total_posts)->limit($total_posts)->orderBy("id", "desc")->get();

        return response()->json($rooms);
    }


    public function details(Request $request)
    {
        if ($request->id) {
            $room = Room::find($request->id);
            $user_count = RoomUser::where("room_id", $room->id)->count() + 1;
            return response()->json(["owner" => $room->owner, "user_count" => $user_count, "topic" => $room->topic]);
        }

        return response("", 403);
    }

DB info
+------------------------+
| Tables_in_project      |
+------------------------+
| failed_jobs            |
| migrations             |
| password_resets        |
| personal_access_tokens |
| room_users             |
| rooms                  |
| topics                 |
| users                  |
+------------------------+


Users
+-------------------+---------------------+------+-----+---------+----------------+
| Field             | Type                | Null | Key | Default | Extra          |
+-------------------+---------------------+------+-----+---------+----------------+
| id                | bigint(20) unsigned | NO   | PRI | NULL    | auto_increment |
| name              | varchar(255)        | NO   |     | NULL    |                |
| username          | varchar(255)        | NO   | UNI | NULL    |                |
| email             | varchar(255)        | NO   | UNI | NULL    |                |
| email_verified_at | timestamp           | YES  |     | NULL    |                |
| password          | varchar(255)        | NO   |     | NULL    |                |
| remember_token    | varchar(100)        | YES  |     | NULL    |                |
| created_at        | timestamp           | YES  |     | NULL    |                |
| updated_at        | timestamp           | YES  |     | NULL    |                |
| profile_picture   | varchar(255)        | YES  |     | NULL    |                |
| privilege_level   | int(11)             | NO   |     | 0       |                |
+-------------------+---------------------+------+-----+---------+----------------+


Rooms
+-------------+---------------------+------+-----+---------+----------------+
| Field       | Type                | Null | Key | Default | Extra          |
+-------------+---------------------+------+-----+---------+----------------+
| id          | bigint(20) unsigned | NO   | PRI | NULL    | auto_increment |
| name        | varchar(255)        | NO   |     | NULL    |                |
| description | text                | YES  |     | NULL    |                |
| topic_id    | bigint(20) unsigned | NO   | MUL | NULL    |                |
| owner_id    | bigint(20) unsigned | NO   | MUL | NULL    |                |
| created_at  | timestamp           | YES  |     | NULL    |                |
| updated_at  | timestamp           | YES  |     | NULL    |                |
+-------------+---------------------+------+-----+---------+----------------+



Topics
+------------+---------------------+------+-----+---------+----------------+
| Field      | Type                | Null | Key | Default | Extra          |
+------------+---------------------+------+-----+---------+----------------+
| id         | bigint(20) unsigned | NO   | PRI | NULL    | auto_increment |
| created_at | timestamp           | YES  |     | NULL    |                |
| updated_at | timestamp           | YES  |     | NULL    |                |
| name       | varchar(255)        | NO   | UNI | NULL    |                |
+------------+---------------------+------+-----+---------+----------------+




Users in rooms
+------------+---------------------+------+-----+---------+----------------+
| Field      | Type                | Null | Key | Default | Extra          |
+------------+---------------------+------+-----+---------+----------------+
| id         | bigint(20) unsigned | NO   | PRI | NULL    | auto_increment |
| room_id    | bigint(20) unsigned | NO   | MUL | NULL    |                |
| user_id    | bigint(20) unsigned | NO   | MUL | NULL    |                |
| created_at | timestamp           | YES  |     | NULL    |                |
| updated_at | timestamp           | YES  |     | NULL    |                |
+------------+---------------------+------+-----+---------+----------------+

我遇到的问题是，这是非常非常低效的，因为我必须为每个房间分别查询房间的详细信息，这在部署后会非常慢，甚至更慢在我的本地机器上。

我不确定如何处理它。

我知道的一种方法是使用 Laravel 提供的关系，但还有另一个问题

当我查询所有房间时，我 return 他们回来了。用户模型函数（访问一对一和一对多等关系的函数）仅在 Laravel 中可用，当然它们不会与对 JS 的响应一起返回。

如何查询 rooms table 并包含与房间相关的所有信息（主题、所有者、房间中的所有用户；他们的 ID 存储在 room_users , 所有用户计数)

我正在使用：

ReactJS 17.0.2
Laravel 9
PHP 8.1
MySQL 版本 15.1 分发 10.7.3-MariaDB

Answer 1

感谢 ynber 帮助评论。

我用eloquent中的with函数解决了。

在 RoomController 的 all 函数中，我将查询更改为

$rooms = Room::with(["topic", "owner", "users"])->offset(($page - 1) * $total_posts)->limit($total_posts)->orderBy("id", "desc")->get();

传递给 with 的数组需要在 Room 的模型中定义函数名称，在我的例子中如下所示

    public function topic()
    {
        return $this->belongsTo(Topic::class);
    }

    public function owner()
    {
        return $this->belongsTo(User::class);
    }

    public function users()
    {
        return $this->belongsToMany(User::class, "room_users");
    }

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