Laravel 预加载仅在调用属性时有效

Question

我已经定义了我的 Slot 模型来加载来自 User 模型的关系，如下所示：

public function userAssignedFull(): HasOne {
    return $this->hasOne(User::class,'id','user_assigned');
}

('slots' table 包含 'user_assigned' 字段，我通过该字段连接到 'id' 上的用户记录)

以下代码找到插槽模型但没有 'userAssignedFull'。我只得到 'user_assigned'.

中的用户 ID

  $slot = Slot::with('userAssignedFull')->find($slot_id);

但后来称这个为 returns 我想要的关系：

$fullUserModel = $slot->userAssignedFull;

谁能告诉我我做错了什么？

Answer 1

Builder::with() returns the Builder 个实例。

所以你必须调用$slot->userAssignedFull;来获取数据集合。

来自docs：

When accessing Eloquent relationships as properties, the relationship data is "lazy loaded". This means the relationship data is not actually loaded until you first access the property.

而这个$slot->userAssignedFull;就是你的"first access the property".

Answer 2

试试这个

$slot = Slot::where('id', $slot_id)->with('userAssignedFull')->first();
$slot->userAssignedFull;

Laravel 预加载仅在调用属性时有效

Laravel Eager-loading works only when calling attribute

eager-loading

laravel

eloquent

eloquent-relationship