Question

I add for template (index.html.twig) simply:

{{ dump(product) }}

and i have error:

The function "dump" does not exist in AcmeStoreBundle:Default:index.html.twig at line 2 

Why this function is not enable, and how can i enable this?

Answer 1

You need to configure the debugging extension:

# app/config/config.yml
services:
    acme_hello.twig.extension.debug:
        class:        Twig_Extension_Debug
        tags:
             - { name: 'twig.extension' }

Per the link mentioned above, Twig debugging is set to work by default in Symfony 2.5+ running Twig 1.16+, and the custom service definition is not necessary. See this answer for more details.