How to delete

[Roparzh Hemon]

  I'm just beginning to learn RedBeansPHP4, and I'm experimenting with the code below, that implements a toy model
for a blog.
  Here is the point at which I'm stuck : after having created all the data, I want to delete topic number 12. I tried

R::trash('topic',12);

(as in the code below) but it does nothing. What is the proper way to do it ?

require 'rb.php';

R::setup(  );

$world=R::dispense ('world');
$world->name = 'world';
$usernames=array('Amy','Bob','Cathy');
$users=array();


for($j1=1;$j1<=3;$j1+=1) {
          $user = R::dispense('user');
          $username=$usernames[$j1-1];
          $user->username = ($username);
          $users[$j1]=$user;
          $world->xownUserList[] = $user;
}

for($i1=1;$i1<=3;$i1+=1) {
  $category = R::dispense('category');
  $catname='Category'.$i1;
  $category->catname = ($catname);
  $world->xownCategoryList[] = $category;
  for($i2=1;$i2<=3;$i2+=1) {
      $subcat = R::dispense('subcategory');
      $subcatname=$catname.'/Subcategory'.$i2;
      $subcat->subcatname = ($subcatname);
      $category->xownSubcategoryList[] = $subcat;
      for($i3=1;$i3<=3;$i3+=1) {
          $topic = R::dispense('topic');
          $topicname=$subcatname.'/Topic'.$i3;
          $topic->topicname = ($topicname);
          $subcat->xownTopicList[] = $topic;
          for($i4=1;$i4<=3;$i4+=1) {
              $post = R::dispense('post');
              $postname=$topicname.'/Post'.$i4;
              $post->postname = ($postname);
              $topic->xownPostList[] = $post;
              $users[$i4]->xownPostList[] = $post;
        }
    }
   
  }
}


R::trash('topic',12);
R::store($world);