Can't get assetic to cssrewrite prod images properly - css

Question

Using Symfony and Assetic I cannot get css images to 'dump' correctly in my prod environment.
They continue to link back to the web/bundle/...etc.. location.
I have a very basic cssrewrite setup:
# Assetic Configuration
assetic:
debug: "%kernel.debug%"
use_controller: false
filters:
cssrewrite:
#closure:
# jar: "%kernel.root_dir%/Resources/java/compiler.jar"
#yui_css:
# jar: "%kernel.root_dir%/Resources/java/yuicompressor-2.4.7.jar"
My template:
{% stylesheets 'bundles/<my bundle>/css/style.css' filter='cssrewrite' %}
<link rel="stylesheet" href="{{ asset_url }}">
{% endstylesheets %}
I have the prod version of app.php in place with debug false:
use Symfony\Component\ClassLoader\ApcClassLoader;
use Symfony\Component\HttpFoundation\Request;
$loader = require_once __DIR__.'/../app/bootstrap.php.cache';
// Use APC for autoloading to improve performance.
// Change 'sf2' to a unique prefix in order to prevent cache key conflicts
// with other applications also using APC.
/*
$apcLoader = new ApcClassLoader('sf2', $loader);
$loader->unregister();
$apcLoader->register(true);
*/
require_once __DIR__.'/../app/AppKernel.php';
//require_once __DIR__.'/../app/AppCache.php';
$kernel = new AppKernel('prod', false);
$kernel->loadClassCache();
//$kernel = new AppCache($kernel);
// When using the HttpCache, you need to call the method in your front controller instead of relying on the configuration parameter
//Request::enableHttpMethodParameterOverride();
$request = Request::createFromGlobals();
$response = $kernel->handle($request);
$response->send();
$kernel->terminate($request, $response);
I have done:
app/console assets:install --symlink
All seems fine
Then I clear the prod cache
OK
app/console assetic:dump --env=prod
My css and js copy out with the expected file names, however I still have url('../../bundle/..etc../images/bg.png'); appearing in my css
In the symlinked version the css is: url('../images/bg.png');
So it must be something to do with assetic.
What I expect is for the 'dump'ed css to contain links like url('../images/bg.png');
And for the images themselves to be copied out to web/images/123abc.png
Should I expect this from assetic and if so what am I doing wrong?
Thanks, in advance.

Answer 1

// In Config.yml file
# Assetic Configuration
assetic:
debug: "%kernel.debug%"
use_controller: false
bundles: [ ]
In app.php file
//If it is in dev environment In your app_dev.php file contain like this
$kernel = new AppKernel('prod', true);
$kernel->loadClassCache();
// If it is in prod environment, In your app.php file contain like this
$kernel = new AppKernel('prod', true);
$kernel->loadClassCache();