BooksController.php

<?php
#/app/controller/BooksController.php
class BooksController extends AppController {
     public function index() 
     {
          $this->Book->recursive = 1;
          $books = $this->Book->find('all');
          $this->set('authors', $authors);
     }

     public function add() 
     {
        if ($this->request->is('post')) {
            $this->Book->create();
            if ($this->Book->save($this->request->data)) {
                $this->Session->setFlash(__('Inserimento avvenuto con successo'));
               $this->redirect(array('action'=>'index'));
            }
            $authors = $this->Book->Author->find('list',array('fields'=>array('id','title')));
            $this->set(compact('authors'));
            $this->Session->setFlash(__('Inserimento fallito.'));
        }
    }

    public function edit($id = null)
    {
        $this->Book->id = $id;
        if(!$this->Book->exists()) {
            $this->setFlash('Libro non trovato','flash-error');
            $this->redirect(array('action'=>'index'));
           exit;
        }
        if ($this->request->is('post') || $this->request->is('put')) {
            if ($this->Book->save($this->request->data)) {
                $this->Session->setFlash(__('Aggiornamento avvenuto con successo'), 'flash-success');
                $this->redirect(array('action' => 'index'));
                exit;
            }
            $this->Session->setFlash(__('Problemi in fase di Aggiornamento.'), 'flash-error');
        } 
        $authors = $this->Book->Author->find('list',array('fields'=>array('id','title')));
        $this->set(compact('authors'));
        $this->set('book', $this->Book->findById($id)); 
    } 

    public function delete($id = null) 
    { 
        $this->layoyt = false; 
        $this->auotRender = false; 
        if ($this->request->is('get')) throw new MethodNotAllowedException();  
        if ($this->Book->delete($id)) { 
            $this->Session->setFlash(__('Cancellazione avvenuta con successo'), 'flash-success'); 
            $this->redirect(array('action' => 'index')); 
            exit; 
       } 
       $this->Session->setFlash(__('Problemi in fase di eliminazione'), 'flash-error'); 
    } 
}