Cakephp Controller Scaffold

CategoriesController.php

<?php
class CategoriesController extends GerenciadorAppController{
	public $components = array('Error');

	public function index(){
		$this->set('categories', $this->Category->find('all'));
	}
	public function add(){
		$this->set('label', 'Cadastrar categoria');

		if($this->request->is('post')){
			$this->set('category', $this->request->data);
			$this->_saveCategory($this->request->data);
		}

		$this->render('_form');
	}
	public function edit($category_id = null){
		$this->_setCategory($category_id);

		$this->set('label', 'Alterar categoria');

		if($this->request->is('post')){
			$this->request->data['Category']['id'] = $category_id;
			$this->_saveCategory($this->request->data);
		}
		$this->render('_form');
	}
	public function delete($category_id = null){
		$this->_setCategory($category_id);

		if($this->Category->delete()){
			$this->Session->setFlash('Categoria removida com sucesso!','flash_success');
		} else {
			$this->Session->setFlash('Falha ao remover a categoria. Remova todos os produtos que pertencem a ela primeiro.', 'flash_fail');
		}

		$this->redirect(array('action' => 'index'));
	}

	private function _saveCategory($data){
		if($this->Category->save($data)){
			$this->Session->setFlash('Categoria salva com sucesso!','flash_success');
			$this->redirect(array('action' => 'index'));
		} else {
			$this->Error->set($this->Category->invalidFields());
		}
	}

	private function _setCategory($category_id){
		$this->Category->id = $category_id;

		if(!$this->Category->exists()){
			$this->Session->setFlash('Esta categoria não existe.','flash_fail');
			$this->redirect(array('action' => 'index'));
		}

		$this->set('category', $this->Category->read(null));
	}
}
?>