[TOC] 跨模型更新時間戳 簡單的來說，就是一條評論更新的時候，順便把文章的'updated_at'字段也更新了； ~~~ namespace App; use Illuminate\Database\Eloquent\Model; class Comment extends Model { /** * All of the relationships to be touched. * * @var array */ protected $touches = ['post']; /** * Get the post that the comment belongs to. */ public function post() { return $this->belongsTo('App\Post'); } } ~~~ 設置$touches這個屬性； # 跨模型更新時間戳 簡單的來說，就是一條評論更新的時候，順便把文章的'updated_at'字段也更新了； ~~~ namespace App; use Illuminate\Database\Eloquent\Model; class Comment extends Model { /** * All of the relationships to be touched. * * @var array */ protected $touches = ['post']; /** * Get the post that the comment belongs to. */ public function post() { return $this->belongsTo('App\Post'); } } ~~~ 設置$touches這個屬性； 然后你更新Comment的時候，就會把Post的'updated_at'字段也更新了；