Inheritance: extends Illuminate\Database\Eloquent\Model
 public function save(array $options = [])
 {
     if (empty($this->id)) {
         $this->id = self::max('id') + 1;
     }
     parent::save($options);
 }
 /**
  * Deletes a blog post and all
  * the associated comments.
  *
  * @return bool
  */
 public function delete()
 {
     // Delete the comments
     $this->comments()->delete();
     // Delete the blog post
     return parent::delete();
 }