test.php

<?php

/**
 * Ideas for parameter converters
 * 
 * I've used the word argument here rather than convert or converter, 
 * because there may not be any converting as such. It may be that things are 
 * plucked out of the request etc
 * 
 * The idea being that some of the controller arguments come from the url, 
 * some from the query or attributes and we're trying to make mapping routes to services easier and more explicit
 * /

/**
 * Extend request with setArgument(or some aptly named method), allowing total flexibility
 */
$app->post("/user/{user}/team", "user.controller.update_team:execute")
    ->convert('user', function($user) use ($app) { return $app['user.repository']->getUser($request->attributes->get('user_id')); })
    ->before(function(Request $request) use ($app) {
      $request->setArgument('team', $app['team.repository']->getUser($request->attributes->get('team_id')));
    });
    
/**
 * Extend route with a flexible arguments(or some aptly named method), 
 * that can return a key value map of items to be used as arguments
 */
$app->post("/user/{user}/team", "user.controller.update_team:execute")
    ->convert('user', function($user) use ($app) { return $app['user.repository']->getUser($request->attributes->get('user_id')); })
    ->arguments(function(Request $request) use ($app) {
      return array(
        'team' => $app['team.repository']->getUser($request->attributes->get('team_id')),
      );
    });
    
/**
 * Individual converters
 */
$app->post("/user/{user}/team", "user.controller.update_team:execute")
    ->convert('user', function($user) use ($app) { return $app['user.repository']->getUser($request->attributes->get('user_id')); })
    ->argument('team', function(Request $request) use ($app) {
      return $app['team.repository']->getUser($request->attributes->get('team_id'));
    });
    

/**
 * Nothing special, we just manually wrap the controller for these circumstances
 */
$app->post("/user/{user}/team", function(User $user, Request $request, Application $app) {
        $team = $app['team.repository']->getUser($request->attributes->get('team_id'));
        return $app["user.controller.update_team"]->execute($user, $team);
    })
    ->convert('user', function($user) use ($app) { return $app['user.repository']->getUser($request->attributes->get('user_id')); });
    
/**
 * Individual converters, specific to fields. 
 */
$app->post("/user/{user}/team", "user.controller.update_team:execute")
    ->convert('user', function($user) use ($app) { return $app['user.repository']->getUser($request->attributes->get('user_id')); })
    ->convertPost('team_id', "team", function($id) use ($app) {
      return $app['team.repository']->getUser($id));
    });