How to create threaded list in CakePHP? - list

Question

I create table: id, name, thread_id
The mainly thread has thread_id = 0, but their children has theard_id = id of parent, and how is the best and simplest solution to create list with children, and looks like:
Category 1
Product 1
Product 2
Category 2
Product 3
etc...
Maybe You have better solution for such a list?
Sorry, for my english:)

Answer 1

I suspect that the easiest way may be to use Cake's own TreeBehavior. More on that at http://book.cakephp.org/view/91/Tree. I've never used it personally, but have heard good things. It should provide all of the tools (and instruction) you need.

Answer 2

One of easiest and efficient is to use Tree behavior as proposed by kicaj-pl.
But I suggest you to consider MultiTree Behavior. It's also using nested tree database model but allows you to create many trees with different root_id and independent left and right values (so update of one tree doesn't update any other).

Answer 3

Ah! I found this sentence: When You use find('threaded') you have to field 'parent_id' for creating structure like tree...
All works fine!
Thanks for replies, bye!

Answer 4

Try the MPPT logic for It. For that you need 3 fields in your database table viz parent_id , lft , rght. And to implement it using CakePHP, CakePHP already provided the function for it for that please refer http://book.cakephp.org/view/228/Basic-Usage :)

Answer 5

1.First, your model must use "Tree" behaviour in model file (Modelname.php - in my case Post.php)
public $actsAs = array('Tree');
2.Next you need to retrieve threaded results and pass them to a view (ModelnamesController.php - in my case PostsController.php).
$posts = $this->Post->find('threaded');
$this->set('posts', $posts);
3.Finally, here's a template you can use, that renders infinitely threaded list for the above results
<div id="posts_navi">
<? function renderPosts($postsArray, $tmpModel){
//set return for the first time
if(!isset($return)){ $return = ""; }
$return .= '<ul>';
//create list
foreach ($postsArray as $post){
$return .= '<li>';
if($post['Post']['content'] != null){
$return .= $tmpModel->link($post['Post']['title'], array('action' => 'view', $post['Post']['id']),array('escape'=>false));
}else{
$return .= $post['Post']['title'];
}
//if post has children, go deeper
if(!empty($post['children'])){
$return .= renderPosts($post['children'], $tmpModel);
}
$return .= '</li>';
}
$return .= '</ul>';
return $return;
} ?>
<? $tmpModel = $this->Html; // we have to pass html helper inside, I am not sure it this is best way but it works
echo renderPosts($posts, $tmpModel); //finally, we render the $result returned. ?>
</div>