欢迎各位兄弟 发布技术文章
这里的技术是共享的
I have a many to many relationship between two models, users and roles. Is there a difference between saving a relationship using the save() method and using the attach() method?
$user->roles()->save($role, ['expires' => $expires]); //using save
$user->roles()->attach($roleId, ['expires' => $expires]);// using attachAre the two equivalent? I personally dont see the difference. Thoughts?
Here is the snippet of code for the save() method. You'll see that it eventually calls 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, $touch); ($touch 应该是更新关联表的时间戳)
return $model;
}One big difference is that it also saves the model that you are passing to it. In other words, you can essentially create a new role (or even update the old one) while also attaching it to the user. For example:
// 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]);