Symfony2 form entity style each option differently (collapse) - symfony

Question

I have an entity field (visitors) in a form. I would like to highlight a person according to its status.
->add('visitors', 'entity', array(
'class' => "T2m3Bundle:Person",
'multiple' => true,
'property' => 'entireName',
'required' => false,
)
I have a method getStatus, that returns 4 states. On every state I want to put different "style" in an option tag.
Here is the example:
<select>
<option value="1">Mary</option>
<option value="2" class="alert alert-danger">John</option>
<option value="3" class="alert alert-success">Peter</option>
<option value="4" class="alert alert-warning">Robert</option>
</select>
So I want to do something like this:
{% for visitor in form.visitors %}
{% set index = visitor.vars.value %}
{% set entity = form.visitors.vars.choices[index].data %}
{% if entity.status == 1 %}
{{ form_widget(visitor) }}
<span class="alert alert-warning">{{ entity.entireName }}</span>
{% endif %}
{% if entity.status == 2 %}
{{ form_widget(visitor) }}
<span class="alert alert-danger">{{ entity.entireName }}</span>
{% endif %}
....
{% endfor %}
This example works for 'expanded' => true but not for collapse type. I would be really thankful for an answer.
Thanks in advance!
EDIT:
Expanded use this template with form_widget(...):
{% block choice_widget_expanded -%}
<div {{ block('widget_container_attributes') }}>
{%- for child in form %}
{{- form_widget(child) -}}
{{- form_label(child) -}}
{% endfor -%}
</div>
{% endblock choice_widget_expanded %}
but I don't know how to render manually collapsed type, where there is no {{- form_widget(...) -}}

Answer 1

Try to override the twig choice widget : refer to this link to find the according block. It's something like this
{% block choice_widget_collapsed -%}
{% if required and placeholder is none and not placeholder_in_choices and not multiple -%}
{% set required = false %}
{%- endif -%}
<select {{ block('widget_attributes') }}{% if multiple %} multiple="multiple"{% endif %}>
{% if placeholder is not none -%}
<option value=""{% if required and value is empty %} selected="selected"{% endif %}>{{ placeholder|trans({}, translation_domain) }}</option>
{%- endif %}
{%- if preferred_choices|length > 0 -%}
{% set options = preferred_choices %}
{{- block('choice_widget_options') -}}
{% if choices|length > 0 and separator is not none -%}
<option disabled="disabled">{{ separator }}</option>
{%- endif %}
{%- endif -%}
{% set options = choices -%}
{{- block('choice_widget_options') -}}
</select>
{%- endblock choice_widget_collapsed %}
{% block choice_widget_options -%}
{% for group_label, choice in options %}
{%- if choice is iterable -%}
<optgroup label="{{ group_label|trans({}, translation_domain) }}">
{% set options = choice %}
{{- block('choice_widget_options') -}}
</optgroup>
{%- else -%}
{# HERE we define the class based on the status #}
{% if status is defined %}
{% if status == 1 %}
{% set status_class = 'alert alert-warning' %}
{% elseif status == 2 %}
{% set status_class = 'alert alert-danger' %}
{% elseif ... %}
....
{% endif %}
{% endif %}
<option value="{{ choice.value }}"{% if choice is selectedchoice(value) %} selected="selected"{% endif %} {% if status_class is defined %} class="{{ status_class }}" {% endif %} >{{ choice.label|trans({}, translation_domain) }}</option>
{%- endif -%}
{% endfor %}
{%- endblock choice_widget_options %}
Finally in your template, call the widget like this :
{% for visitor in form.visitors %}
{% set index = visitor.vars.value %}
{% set entity = form.visitors.vars.choices[index].data %}
{{ form_widget(visitor, {'status': entity.status}) }}
....
{% endfor %}
This is not tested, but should work. Let me know.