Laravel Eloquent - 关系的 firstOrCreate()
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Laravel Eloquent - firstOrCreate() on a relationship
提问by Kousha
When I try the firstOrCreate()on a relationship of another model, it does not work:
当我尝试firstOrCreate()另一个模型的关系时，它不起作用：
Client::find($id)->users()->firstOrCreate(array('email' => $email));
This returns an error saying
这将返回一个错误说
Call to undefined method Illuminate\Database\Query\Builder::firstOrCreate()
调用未定义的方法 Illuminate\Database\Query\Builder::firstOrCreate()
Running this directly on the model Userwill work though.
不过，直接在模型上运行它User会起作用。
采纳答案by delatbabel
This won't work, you have to do it manually/directly using User model because users() should return a collection object
这行不通，您必须手动/直接使用 User 模型来完成，因为 users() 应该返回一个集合对象
This is correct, the users() function does not return a (new, empty or created) User model, it returns a collection object.
这是正确的， users() 函数不返回（新的、空的或创建的）用户模型，它返回一个集合对象。
It's also documented http://laravel.com/docs/5.1/eloquent-relationships#inserting-related-modelsif you use the laravel relations than it should work.
如果您使用 laravel 关系而不是它应该工作，它还记录了http://laravel.com/docs/5.1/eloquent-relationships#inserting-related-models。
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.
您误解了该文件。关系对象有一个 create() 方法和一个 save() 方法，但是关系对象不是一个完整的模型对象。要获得完整用户模型对象（例如 firstOrCreate()）的所有功能，您必须在模型对象上调用它们。
So, for example, this code should work:
因此，例如，此代码应该可以工作：
$user = User::firstOrNew(array('email' => $email));
Client::find($id)->users()->save($user);
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.
请注意，从 Client 模型的关系中直接将 $user 对象保存在此处应该没问题，即使它可能已经存在于此处，但在您这样做时它应该只更新 $user 对象上的 client_id 字段。
回答by Julio Popócatl
This should do:
这应该做：
Client::find($id)->first()->users()->firstOrCreate(array('email' => $email));
