Laravel Attach()方法不适用于hasMan [英] Laravel attach() method not working to hasMany side
问题描述
该应用程序具有以下模型:
The application has the models:
class Atividade extends Eloquent {
public function intervencoes() {
return $this->belongsToMany('Intervencao');
}
}
class Intervencao extends Eloquent {
public function atividades() {
return $this->hasMany('Atividade');
}
}
以下代码有效:
Atividade::find($id)->intervencoes()->attach($intervencao_id);
但是,这个...
Intervencao::find($id)->atividades()->attach($atividade_id);
返回BadMethodCallException:
Returns an BadMethodCallException:
调用未定义的方法Illuminate \ Database \ Query \ Builder :: attach()
Call to undefined method Illuminate\Database\Query\Builder::attach()
我试图建立多对多关系,所以只需要更改此...
I was trying to set a many-to-many relationship, so just needed to change this...
return $this->hasMany('Atividade');
对此:
return $this->belongsToMany('Atividade');
推荐答案
在此处查看Laravel文档: http://laravel.com/docs/eloquent#inserting-related-models
See the Laravel documentation here: http://laravel.com/docs/eloquent#inserting-related-models
基本上,您为相同的两个表设置了两种不同类型的关系-您已经建立了多对多和一对多的关系.似乎您可能想要多对多,因此您需要更改此行:
Basically you have set up two different types of relationships for the same two tables - you've set up a many-to-many and a one-to-many. It looks as though you probably wanted a many-to-many, so you'll need to change this line:
return $this->hasMany('Atividade');
对此:
return $this->belongsToMany('Atividade');
这会将关系设置为多对多关系,然后将支持attach()
方法.
This will set the relationship up as a many-to-many relationship, which will then support the attach()
method.
attach()
方法仅适用于多对多,对于其他关系,有save()
或saveMany()
和associate()
(请参见上面的文档).
The attach()
method is only for many-to-many, for other relationships there's save()
or saveMany()
and associate()
(see the docs linked above).
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