Laravel关于删除的书删除相关的所有帖子和评论

Question

此片段来自我的Book模型：

 class Book extends \Eloquent
 {  

 public function delete()

     {
         // delete all related cover photos
         $this->cover()->delete();
         // delete all related comments photos
         $this->posts()->comments()->delete();
         // delete all related Blurbs
         $this->posts()->delete();

         // delete the model
         return parent::delete();
     }
 }

在Post模型中我写道：

 function book() {

         return $this->belongsTo('Book');

     }

     function comments() {

         return $this->hasMany('Comment');

     }

     function user() {

         return $this->belongsTo('User');

     }

 public function delete()
     {

         // delete all related comments also
         $this->comments()->delete();
         // delete the model
         return parent::delete();
     }

在Comment模型中我写道：

 function posts() {

         return $this->belongsTo('Post');
     }

     function user() {

         return $this->belongsTo('User');
     }

现在，当我试图删除这本书时，它说。 Call to undefined method Illuminate\Database\Query\Builder::comments()

所以，我理解书模型删除评论不正常，但不明白如何解决。

Answer 1

您可能需要使用正确的索引，外键更新数据库架构，并且正如@Razor所说，级联...请参阅http://laravel.com/docs/schema#foreign-keys