Laravel Eloquent-关系上的firstOrCreate() [英] Laravel Eloquent - firstOrCreate() on a relationship

问题描述

当我在另一个模型的关系上尝试firstOrCreate()时，它不起作用:

When I try the firstOrCreate() on a relationship of another model, it does not work:

Client::find($id)->users()->firstOrCreate(array('email' => $email));

这将返回一条错误消息

调用未定义的方法Illuminate \ Database \ Query \ Builder :: firstOrCreate()

Call to undefined method Illuminate\Database\Query\Builder::firstOrCreate()

虽然可以直接在模型User上运行它.

Running this directly on the model User will work though.

推荐答案

这行不通，您必须手动/直接使用User模型来执行此操作，因为users()应该返回一个集合对象

This won't work, you have to do it manually/directly using User model because users() should return a collection object

这是正确的，users()函数不会返回(新的，空的或已创建的)用户模型，而是返回一个集合对象.

This is correct, the users() function does not return a (new, empty or created) User model, it returns a collection object.

还记录了 http://laravel.com/docs/5.1 /eloquent-relationships#inserting-related-models (如果您使用的是laravel关系，则应该有效).

It's also documented http://laravel.com/docs/5.1/eloquent-relationships#inserting-related-models if you use the laravel relations than it should work.

您误解了该文档.关系对象具有create()方法和save()方法，但是关系对象不是完整的模型对象.要获得完整的User模型对象(例如firstOrCreate())的所有功能，则必须在模型对象上调用它们.

You are misinterpreting that document. The relationship object has a create() method and a save() method, however the relationship object is not a full model object. To get all of the functionality of a full User model object (such as firstOrCreate()) then you have to call them on the model object.

因此，例如，此代码应该起作用:

So, for example, this code should work:

$user = User::firstOrNew(array('email' => $email));
Client::find($id)->users()->save($user);

请注意，可以直接从客户端模型的关系中将$ user对象保存在此处，即使它可能已经存在于此处，也应在执行此操作时只更新$ user对象上的client_id字段.

Note that it should be OK to save the $user object here directly from the Client model's relationship, even though it may already exist here, it should just update the client_id field on the $user object when you do so.

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