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 attach
这两者是等价的吗？我个人看不出有什么不同.思想？
下面是save()方法的代码片段.您会看到它最终会呼叫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. 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]);