問題描述

我不太確定我是否理解 associate 方法在 Laravel 中.我理解這個想法，但我似乎無法讓它發揮作用.

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.

使用這個(蒸餾)代碼:

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);

當我嘗試運行它時，我收到一個 Call to undefined method IlluminateDatabaseQueryBuilder::associate().

I get a Call to undefined method IlluminateDatabaseQueryBuilder::associate() when I try to run this.

據我所知，我完全按照文檔中的說明進行操作.

From what I can read, I do it exactly as is stated in the docs.

我做錯了什么?

推薦答案

我不得不承認，當我第一次開始使用 Laravel 時，我必須始終如一地參考文檔的部分關系，甚至在某些情況下我不太對勁.

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.

為了幫助您，associate() 用于更新 belongsTo() 關系.查看您的代碼，從 $user->customer() 返回的類是一個 hasOne 關系類，上面沒有關聯方法.

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.

如果你反過來做.

$user = new User($data);
$customer = new Customer($customerData);

$customer->user()->associate($user);
$customer->save();

它會像 $customer->user() 是 belongsTo 關系一樣工作.

It would work as $customer->user() is a belongsTo relationship.

反過來，您需要先保存用戶模型，然后將客戶模型保存到其中，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);

可能沒有必要先保存用戶模型，但我總是這樣做，不知道為什么.

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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