[英]Laravel 5 - Many to Many - Attach versus Save
I have a many to many relationship between two models, users and roles. 我有两个模型,用户和角色之间的多对多关系。 Is there a difference between saving a relationship using the save() method and using the attach() method? 使用save()方法保存关系和使用attach()方法之间有区别吗?
$user->roles()->save($role, ['expires' => $expires]); //using save
$user->roles()->attach($roleId, ['expires' => $expires]);// using attach
Are the two equivalent? 这两个是等价的吗? I personally dont see the difference. 我个人没有看到差异。 Thoughts? 思考?
Here is the snippet of code for the save()
method. 这是save()
方法的代码片段。 You'll see that it eventually calls attach()
. 你会看到它最终调用attach()
。
/**
* Save a new model and attach it to the parent model.
*
* @param \Illuminate\Database\Eloquent\Model $model
* @param array $joining
* @param bool $touch
* @return \Illuminate\Database\Eloquent\Model
*/
public function save(Model $model, array $joining = [], $touch = true)
{
$model->save(['touch' => false]);
$this->attach($model->getKey(), $joining, $touch);
return $model;
}
One big difference is that it also saves the model that you are passing to it. 一个很大的区别是它还可以保存您传递给它的模型。 In other words, you can essentially create a new role (or even update the old one) while also attaching it to the user. 换句话说,您实际上可以创建一个新角色(甚至更新旧角色),同时将其附加到用户。 For example: 例如:
// Get the user
$user = User::first();
// Instantiate a new role
$role = new Role($attributes);
// Creates the role / persists it into the database and attaches this role to the user
$user->roles()->save($role, ['expires' => $expires]);
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