Exploring Respect\Rest concepts

bootstrap.php

<?php

use Respect\Config\Container;
use Respect\Rest\Dispatcher;
use Respect\Rest\Routers\Fixed;
use Respect\Validation\Validator;
use Doctrine\ORM\EntityManager;
use Twig_Environment;

// see http://github.com/Respect/Config
$config = new Container('config.ini');
$config->em = function() use ($config) {
    return EntityManager::create($config->connectionOptions, $config->doctrineConfiguration);
};
$config->view = function() use ($config) {
    return new Twig_Environment($config->twigLoader, $config->twigConfiguration);
};
$config->valid = function() use ($config) {
    return Validator::string()->noWhitespace()->length(1,15);
};

$dispatcher = new Dispatcher();
$dispatcher->setServiceLocator($config);
$dispatcher->setRouter(new Fixed);
$dispatcher->run();

UsersCollection.php

<?php

namespace Users;

use Doctrine\ORM\EntityManager as Entities;
use Doctrine\ORM\EntityNotFoundException;
use Twig_Environment as Templates;
use Respect\Validation\Validatable as Validator;
use Respect\Validation\Exceptions\ValidationException;

// Zero parameters maps to collections http://example.com/users/
class Collection
{   
   //Auto injected from the context $context->em, $context->view
    public function get(Entities $em, Templates $view) 
    {
        $users = $em->getRepository('User')->findAll();
        return $view->loadTemplate('user.phtml')->render($users); 
    }
}

UsersResource.php

<?php

namespace Users;

use Doctrine\ORM\EntityManager as Entities;
use Doctrine\ORM\EntityNotFoundException;
use Twig_Environment as Templates;
use Respect\Validation\Validatable as Validator;
use Respect\Validation\Exceptions\ValidationException;

// Single parameter maps to resource http://example.com/users/foobar
class Resource
{
    protected $userName;
    
    public function __construct($userName) //"foobar" is used here
    {
        $this->userName = $userName;
    }
    
    //Auto injected from the context $context->em, $context->view, $context->valid
    public function get(Entities $em, Templates $view, Validator $valid) 
    {
        try {
            $valid->assert($this->userName);
            $user = $em->getRepository('User')->findOneBy(array('screen_name' => $this->userName));
            return $view->loadTemplate('user.phtml')->render($user);                
        } catch (ValidationException $e) {
            return new Respect\Rest\Responses\Error($e->getMessage());
        } catch (EntityNotFoundException $e) {
            return new Respect\Rest\Responses\NotFoundError($e->getMessage());
        }
    }
}