[cakephp]treeviewを作るサンプル1/3（モデル）

category.php

<?php
//モデル
	function generateCategoryTree($id=0, $column_id='id', $column_name='name') {

		$tree = array();

		if($id == 0) {
			$children = $this->find(
				'all',
				array(
					'fields' => array($column_id, $column_name),
					'conditions' => array(
						'parent_id' => 0,
					),
				)
			);
		} else {
			$children =  $this->children($id, true, array($column_id, $column_name));
		}

		foreach($children as $child) {
			$id = $child[$this->name][$column_id];
			$name = $child[$this->name][$column_name];
			if($this->childcount($id, true) > 0) {
				$tree[$id] = array($name, $this->generateCategoryTree($id));
			} else {
				$tree[$id] = $name;
			}
		}

		return $tree;
	}