php 无法让 Laravel 助理工作
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Can't get Laravel associate to work
提问by Matthijn
I'm not quite sure if I understand the associatemethod in Laravel. I understand the idea, but I can't seem to get it to work.
我不太确定我是否理解Laravel 中的关联方法。我理解这个想法，但我似乎无法让它发挥作用。
With this (distilled) code:
使用此（蒸馏）代码：
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);
I get a Call to undefined method Illuminate\Database\Query\Builder::associate()when I try to run this.
Call to undefined method Illuminate\Database\Query\Builder::associate()当我尝试运行它时，我得到了一个。
From what I can read, I do it exactly as is stated in the docs.
从我可以阅读的内容来看，我完全按照文档中的说明进行操作。
What am I doing wrong?
我究竟做错了什么？
回答by David Barker
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.
我不得不承认，当我第一次开始使用 Laravel 时，我必须始终参考文档的部分的关系，即使在某些情况下我也没有完全正确。
To help you along, associate()is used to update a belongsTo()relationship. Looking at your code, the returned class from $user->customer()is a hasOnerelationship class and will not have the associate method on it.
助你一臂之力，associate()用于更新一段belongsTo()关系。查看您的代码，从中返回的类$user->customer()是一个hasOne关系类，并且上面没有关联方法。
If you were to do it the other way round.
如果你反过来做。
$user = new User($data);
$customer = new Customer($customerData);
$customer->user()->associate($user);
$customer->save();
It would work as $customer->user()is a belongsTorelationship.
它的工作作为$customer->user()一个belongsTo关系。
To do this the other way round you would first save the user model and then save the customer model to it like:
要以相反的方式执行此操作，您首先要保存用户模型，然后将客户模型保存到其中，例如：
$user = new User($data);
$user->save();
$customer = new Customer($customerData);
$user->customer()->save($customer);
Edit: It may not be necessary to save the user model first but I've just always done that, not sure why.
编辑：可能没有必要先保存用户模型，但我一直这样做，不知道为什么。
回答by alexrussell
As I understand it, ->associate()can onyl be called on a BelongsTo relationship. So, in your example, you coulddo $customer->user()->associate($user). However, in order to 'associate' a Has* relationship you use ->save(), so your code should be $user->customer()->save($customer)
据我了解，->associate()可以在 BelongsTo 关系上调用 onyl。因此，在您的示例中，您可以执行$customer->user()->associate($user). 但是，为了“关联”您使用的 Has* 关系->save()，因此您的代码应该是$user->customer()->save($customer)
