Symfony 2: why form_theme not working for FOS_User registration template?

Question

I have installed FOSUserBundle, customized template MyBundle::User:registration.html.twig with content

{% extends "::layout.html.twig" %}

{% form_theme form _self %}

{% block `form_widget_simple` %}
Hey! I wanna replace all your text fields in this form!
{% endblock %}

{% block content %}
   <h1>Registration</h1>
   {{form(form)}}
{% endblock content %}

My goal is to replace all text fields ( <input type="text"> ) in my form with contents of block form_widget_simple . Code above is not working: all fields are not replaced. But replacements is correct when I copy this code into another template (not related to FOSUserBundle). What is dark magic in the FOS User that prevents my replacements (or in my code)?

Answer 1

Did you follow the documentation ( https://github.com/FriendsOfSymfony/FOSUserBundle/blob/master/Resources/doc/overriding_templates.md ) and correctly registered your bundle as a FOSUserBundle ?

Make sure to do the following modification, as written in the doc :

// src/Acme/UserBundle/AcmeUserBundle.php
<?php

namespace Acme\UserBundle;

use Symfony\Component\HttpKernel\Bundle\Bundle;

class AcmeUserBundle extends Bundle
{
    public function getParent()
    {
        return 'FOSUserBundle';
    }
}