Access data in a Form Choice

When you use an expanded ``ChoiceType`` and need to customize the children ``entry`` blocks,

the ``form.vars`` of entries (radio button or checkbox) may not be enough since each holds a

boolean value meaning whether a choice is selected or not.

To get the full list of choices data and values, you will need to access the ``choices`` variable

from their parent form (the ``ChoiceType`` itself) with ``form.parent.vars.choices``::

Given the advanced object example, each entry would have access to the following variables:

.. code-block:: html+twig

{# `true` or `false`, whether the current choice is selected as radio or checkbox #}

{{ form.vars.data }}

{# the current choice value (i.e a category name when `'choice_value' => 'name'` #}

{{ form.vars.value }}

{# a map of `ChoiceView` or `ChoiceGroupView` instances indexed by choice values or group names #}

{{ form.parent.vars.choices }}

So the Category's entity is inside ``form.parent.vars.choices[key].data``, because the parent knows all the choices.

.. code-block:: html+twig

{% block _form_categories_entry_widget %}

{% set entity = form.parent.vars.choices[form.vars.value].data %}

<tr>

<td>{{ form_widget(form) }}</td>

<td>{{ form.vars.label }}</td>

<td>

{{ entity.name }} | {{ entity.group }}

</td>

</tr>

{% endblock %}