Question

如何在Laravel 5中使用雄辩的方法从3表中获取一些数据？我有3个表，列表，卡，用户

列表模型

public function card()
    {
        return $this->hasMany(Card::class);
    }

卡型号

public function lists()
    {
        return $this->belongsTo(Lists::class);
    }

public function member()
    {
        return $this->belongsToMany(User::class)->withPivot('status','user_role')->withTimestamps();
    }

用户模型

public function card_member(){
        return $this->belongsToMany(Card::class)->withTimestamps();
    }

我想在分配给特定用户的卡中获取列表（例如user_id：2）

喜欢这个JSOn数据

{
    "id": 2,
    "boards_id": "1",
    "list_name": "List 2 B1 U1",
    "position": 2,
    "created_at": "2019-04-03 16:02:03",
    "updated_at": "2019-04-03 16:02:03",
    "card": [
      {
        "id": 8,
        "lists_id": "2",
        "card_title": "Card 3 L2",
        "labels": null,
        "description": null,
        "start_card": null,
        "end_card": null,
        "position": 2,
        "is_archieved": false,
        "created_at": "2019-04-26 15:34:22",
        "updated_at": "2019-04-26 15:34:22"
      },
      {
        "id": 9,
        "lists_id": "2",
        "card_title": "Card 4 L2",
        "labels": null,
        "description": null,
        "start_card": null,
        "end_card": null,
        "position": 3,
        "is_archieved": false,
        "created_at": "2019-04-26 15:34:25",
        "updated_at": "2019-04-26 15:34:25"
      }

表结构：列表：

id
boards_id
listname
position

卡：

id
lists_id
card_title

Card_user（数据透视表）：

id
card_id
user_id

Answer 1

让关系名称从“ member”更改为“ members”，因为这是多对多关系。

public function members()
    {
        return $this->belongsToMany(User::class)->withPivot('status','user_role')->withTimestamps();
    }

您可能会说：

$userId = 2;

$lists = List::with([
    'card' => function ($query) {
        $query->whereHas('members', function ($query) user ($userId) {
            $query->whereKey($userId);
        })
    }
])
->whereHas('card.members', function ($query) use ($userId) {
    $query->whereKey($userId);
})
->get();

所以我们只渴望加载用户ID为2的卡。

如何使用雄辩的方法在laravel中加入3表？

1 个答案: