Symfony ChoiceType deep label customization - symfony

Question

I want to customize my EntityType's choice labels highly, like creating a table with multiple attributes of my model.
So I want to access my choices class attributes. The choices are my entities of class MyClass through the EntityType. How can I do so in twig?
Currently I do it like this:
1. in my FormClass I json_encode all fields I need in my label
2. in my template I json_decode these information and display according
IN CODE:
1.
$builder
->add('field', EntityType::class, [
'class' => MyClass::class,
'multiple' => false,
'expanded' => true,
],
'choice_label' => function (MyClass $myClass) {
$data = [
'name' => $myClass->getName(),
'description' => $myClass->getDescription(),
];
return json_encode($data);
},
])
2.
{% block my_form_widget %}
...
{# form is my 'field' FormView of the EntityType #}
{% for child in form %}
{# child is a FormView, one choice of my EntityType #}
{# child.vars.data is boolean as its a checkbox #}
{% set data = child.vars.label|json_decode %}
create some complex html here, like tables
...
{% endfor %}
...
{% endblock %}
Working. But is there a better way?
Thanks,
Kim

Answer 1

In a Symfony form (or form field, which is just a form of its own) that is mapped to an entity, you always have access to the underlying data in form.vars.data. So in this case, form.vars.data would either be null or an instance of MyClass.
For ease of use in your template, you might do something like:
{% set my_object = form.field.vars.data %}
{% if my_object %}
{{ my_object.getName() }}
{{ my_object.getDescription() }}
{% endif %}
Thus there is no need to re-encode your entity data for the view layer, since it's always already available.
If you are working with an EntityType and want to access the properties of each choice's entity, they are available as well in the choices array:
{% for choice in form.field.vars.choices %}
{{ choice.data.getName() }}
{{ choice.data.getDescription() }}
{% endfor %}
A nice trick when you're trying to access any form data and aren't sure where to look is to temporarily add a line to your template like:
{{ dump(form.field) }}
This will allow you to look through the available data and see what all is available. Note that it requires the Twig debug extension to be enabled, and XDebug to be enabled in PHP in order to make the output look nice.

Answer 2

Ok I got it, here is an example of how to access the data of your EntityType's choices in twig. You can check the child.parent.vars.choices list.
{% block my_form_widget %}
...
{# form is my 'field' FormView of the EntityType #}
{% for child in form %}
{# child is a FormView, one choice of my EntityType #}
{# child.vars.data is boolean as its a checkbox #}
{% for choice in child.parent.vars.choices if choice.value == child.vars.value %}
{{ choice.data.name }} {# contains MyClass name #}
{{ choice.data.description }} {# contains MyClass description #}
{% endfor %}
...
{% endfor %}
...
{% endblock %}