title: How to remove a polymorphic relation in Eloquent?
body: <p>I have a model like this:</p>
  
  <pre><code>&lt;?php
  
  class Post extends Eloquent {
      protected $fillable = [];
  
  
      public function photos()
      {
          return $this-&gt;morphMany('Upload', 'imageable');
      }
  
      public function attachments()
      {
          return $this-&gt;morphMany('Upload', 'attachable');
      }
  
  }
  </code></pre>
  
  <p>and my <code>morphMany</code> table's schema is like this:</p>
  
  <pre><code>CREATE TABLE `uploads` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `raw_name` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
  `name` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
  `size` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
  `downloads` int(11) NOT NULL DEFAULT '0',
  `imageable_id` int(11) DEFAULT NULL,
  `imageable_type` varchar(32) COLLATE utf8_unicode_ci NOT NULL,
  `attachable_id` int(11) DEFAULT NULL,
  `attachable_type` varchar(32) COLLATE utf8_unicode_ci NOT NULL,
  `user_id` int(10) unsigned NOT NULL,
  `created_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
  `updated_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
  PRIMARY KEY (`id`),
  KEY `uploads_user_id_index` (`user_id`),
  CONSTRAINT `uploads_user_id_foreign` FOREIGN KEY (`user_id`) REFERENCES `posts` (`id`) ON DELETE CASCADE
  ) ENGINE=InnoDB AUTO_INCREMENT=45 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
  </code></pre>
  
  <p>now I need to remove one row of this table, I tried <code>$posts-&gt;photos()-&gt;delete();</code> but it removed all rows associated to this <code>Post</code>.</p>
  
  <p>Could someone help me?</p>