Codeigniter Get Nested Hierarchical Data from Database - codeigniter

Question

How can i get Hierarchical Data from db in Codeigniter. I read this :
http://www.sitepoint.com/hierarchical-data-database/
And i do good that but i cant optimize this tutorial with my model, controler and views
Default Category
|----- Sub category
| ----One more category
|----- Somthing else
I try but dont show sub category:
My model:
public function fetchChildren($parent, $level) {
$this->handler = $this->db->query("SELECT * FROM content_categories WHERE parent_id='".$parent."' ");
foreach($this->handler->result() as $row ) {
$this->data[$row->id] = $row;
//echo str_repeat(' ',$level).$row['title']."\n";
}
return $this->data;
}
Controller :
$this->data['node'] = $this->categories_model->fetchChildren(' ',0);
Views:
<table class="module_table">
<thead>
<tr>
<th><?php echo lang('categories_table_title'); ?></th>
</tr>
</thead>
<tbody>
<?php foreach ($node as $row) : ?>
<tr>
<th> <?php echo str_repeat('|----', 0+1). $row->title ?> </th>
</tr>
<?php endforeach; ?>
</tbody>
</table>
And output is :
----Default
----Default
----Test Category 1
----Seccond Test Category 1
----Another Test Category 1
When i do this in model all work fine but when i try that to call in controler and loop in view i have result like above example:
This work onlu in model:
public function fetchChildren($parent, $level) {
$this->handler = $this->db->query("SELECT * FROM content_categories WHERE parent_id='".$parent."' ");
foreach($this->handler->result() as $row ) {
echo str_repeat('|-----',$level).$row->title."\n";
$this->fetchChildren($row->title, $level+1);
}
return $this->data;
}
And like output i have :
Default
|----Test Category 1
|----Seccond Test Category 1
|----Another Test Category 1
Any one have solution or example thanks.

Answer 1

Try storing the level value for each category.
In your model:
public function fetchChildren($parent, $level){
$this->handler = $this->db->query("SELECT * FROM content_categories WHERE parent_id='".$parent."' ");
foreach($this->handler->result() as $row ) {
$row->level = $level;
$this->data[] = $row;
$this->fetchChildren($row->title, $level+1);
}
return $this->data;
}
In your controller:
$this->data['node'] = $this->categories_model->fetchChildren(' ',0);
In your view
<table class="module_table">
<thead>
<tr>
<th><?php echo lang('categories_table_title'); ?></th>
</tr>
</thead>
<tbody>
<?php foreach ($node as $row) : ?>
<tr>
<th><?php echo str_repeat('|----', $row->level). $row->title ?> </th>
</tr>
<?php endforeach; ?>
</tbody>
</table>