Displaying a custom twig template with Sonata and Symfony2 - templates

Question

For my need, I'm planning to add a custom column to a entity list.
I've written this inside the configureListFields :
->add('_action', 'actions', array(
'actions' => array(
'code' => array('template' => 'BOBAdminBundle:test:custom.html.twig'),
)
))
My twig :
<img src="{{ asset('bundles/sonataadmin/famfamfam/delete.png') }}" />
It works.
Problem : I don't know why :S, since I've just copy/paste the code from somewhere.
I figured out than the '_action' determined the name of the column. But what if I want to change it ?
Where does this 'actions' name come from ? Where can I change it ?

Answer 1

The _action is used to add custom actions for the list items. Like edit and delete which are set by default. Here is a full documentation:
List actions
You can set actions for the list items by adding an ‘_action’ field in configureListFields:
<?php
$listMapper->add('_action', 'actions', array(
'actions' => array(
'view' => array(),
'edit' => array(),
)
))
Edit and delete actions are enabled in the default configuration. You can add your own! Default template file is: *SonataAdminBundle:CRUD:list_action[ACTION_NAME].html.twig*
You can specify your own by setting up the ‘template’ option like so:
<?php
$listMapper->add('_action', 'actions', array(
'actions' => array(
'view' => array(),
'edit' => array(),
'delete' => array('template' => 'MyBundle:MyController:my_partial.html.twig'),
)
))