无法让 Laravel 助理工作
我不太确定我是否理解 associate 方法在 Laravel 中.我理解这个想法，但我似乎无法让它发挥作用.
I'm not quite sure if I understand the associate method in Laravel. I understand the idea, but I can't seem to get it to work.
使用这个(蒸馏)代码:
With this (distilled) code:
class User
{
public function customer()
{
return $this->hasOne('Customer');
}
}
class Customer
{
public function user()
{
return $this->belongsTo('User');
}
}
$user = new User($data);
$customer = new Customer($customerData);
$user->customer()->associate($customer);
当我尝试运行它时，我收到一个 Call to undefined method IlluminateDatabaseQueryBuilder::associate().
I get a Call to undefined method IlluminateDatabaseQueryBuilder::associate() when I try to run this.
据我所知，我完全按照文档中的说明进行操作.
From what I can read, I do it exactly as is stated in the docs.
我做错了什么?
推荐答案
我不得不承认，当我第一次开始使用 Laravel 时，我必须始终如一地参考文档的部分关系，甚至在某些情况下我不太对劲.
I have to admit that when I first started using Laravel the relationships where the part that I had to consistently refer back to the docs for and even then in some cases I didn't quite get it right.
为了帮助您，associate() 用于更新 belongsTo() 关系.查看您的代码，从 $user->customer() 返回的类是一个 hasOne 关系类，上面没有关联方法.
To help you along, associate() is used to update a belongsTo() relationship. Looking at your code, the returned class from $user->customer() is a hasOne relationship class and will not have the associate method on it.
如果你反过来做.
$user = new User($data);
$customer = new Customer($customerData);
$customer->user()->associate($user);
$customer->save();
它会像 $customer->user() 是 belongsTo 关系一样工作.
It would work as $customer->user() is a belongsTo relationship.
反过来，您需要先保存用户模型，然后将客户模型保存到其中，例如:
To do this the other way round you would first save the user model and then save the customer model to it like:
$user = new User($data);
$user->save();
$customer = new Customer($customerData);
$user->customer()->save($customer);
可能没有必要先保存用户模型，但我总是这样做，不知道为什么.
It may not be necessary to save the user model first but I've just always done that, not sure why.
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