php - Laravel HasManyThrough 带有 where 语句

Question

我正在使用 Laravel 5.3，并且尝试将 HasManyThrought 关系与 where 语句一起使用，但我不知道如何实现该目标。

所以我有这些表:

Users:
+----+-------+
| id | name  |
+----+-------+
| 1  | James |
+----+-------+

Orders:
+----+---------+------------+
| id | user_id | state      |
+----+---------+------------+
| 1  | 1       | complete   |
+----+---------+------------+
| 2  | 1       | incomplete |
+----+---------+------------+
| 3  | 1       | pending    |
+----+---------+------------+

Order Items:
+----+----------+--------+
| id | order_id | name   |
+----+----------+--------+
| 1  | 1        | Mac    |
+----+----------+--------+
| 2  | 1        | Tablet |
+----+----------+--------+
| 3  | 2        | Laptop |
+----+----------+--------+

现在我想获取用户的订单商品，所以我会这样做:

public function items()
{
    $this-hasManyThrough(Item::class, Order::class)
}

但是!如果我想仅获取其订单被声明为完整的商品，该怎么办？

Answer 1

如果您想获取已验证用户的所有处于完整状态的项目，请使用whereHas()方法:

$items = Item::whereHas('order', function($q) {
    $q->where('state', 'complete')
      ->where('user_id', auth()->user()->id);
})->get();

不要忘记在 Item 模型中定义 order() 关系:

public function order()
{
    return $this->belongsTo(Order::class);
}