Missing Info on configuration for debugging a twig template

[keymaster]

Should mention somewhere:

To debug a twig template, put the following in app/config/config_dev.yml:

services:
twig.extension.debug:
class: Twig_Extensions_Extension_Debug
tags: [ { name: 'twig.extension' } ]

Then, from within the twig template, do:

{% debug varname %}

Be warned that doing {% debug %} by itself can create so much debug info that you will time out. Either increase your timeout or be more specific in what you would like to debug.

Also, note the the WDT displays info about what variables are passed to your template, and their values.

[weaverryan]

Just for a little better readability :)

services:
    twig.extension.debug:
        class: Twig_Extensions_Extension_Debug
        tags:
            - { name: 'twig.extension' } 

[stof]

@keymaster Note that the WDT does not display the variables passed to the template unless you use a custom DataCollector doing this (as implemented in a third party bundle out there IIRC).

[e1024kb]

Be carefull about spaces syntax:

services:
    twig.extension.debug:
        class: Twig_Extensions_Extension_Debug
        tags: { name: 'twig.extension' }

[weaverryan]

Thanks - I've updated my comment to reflect the correct spacing

[weaverryan]

An official section has now been added to the docs in #981 about adding the new dump function.

[Boran]

I just tried out v2.1 and debugging deems to work out of the box, in fact if I add the suggested lines to config_dev.yaml, it says dump not found.

Now I can dump specific variables, but not all valiables "dump()", or a class.
Any suggestions?