How to remove a field in the form twig in Drupal 8?

Question

In Drupal 8, the form twig is like that :

<form{{ attributes }}>
  {{ children }}
</form>

I would like display all fields exept one. Usually we use the without filter but children is a string so that won't work.

<form{{ attributes }}>
  {{ children|without('unwanted') }}
</form>

In the form twig, we can access to the element variable which is an array. But still, the without filter doesn't work here.

<form{{ attributes }}>
 {{ element|without('unwanted') }}
</form>

I know I can display all the fields 1 by 1 with {{ element.field }}, But if my form has new fields they will not be printed until I update the form twig. I want to keep the dynamical purpose.

I do not want to update the form code in php to keep the layout in twig.

Any idea ?

Answer 1

We found a quite good answer :

1. Create the custom template

{#
/**
 * @file
 *
 * Available variables
 * - form
 *
 * @see template_preprocess_mycustomform()
 *
 * @ingroup themeable
 */
#}
{{ form }}

2. Declare the template in the theme function

'mycustomform' => [
  'render element' => 'form',
],

3. Apply the template to the form

$form['#theme'] = 'mycustomform';

Result : In the new template, we can use the without twig function

{{ form|without('myfield') }}

Edit 2023

Maybe a simpler solution :

    <div class="fr-mb-2w">
      <div class="fr-grid-row  fr-grid-row--gutters">
        <div class="fr-col fr-col-md-6">{{ element.email }}</div>
        <div class="fr-col fr-col-md-6">{{ element.profile }}</div>
      </div>
    </div>

    {# Display all other fields. #}
    {% for name in element|keys %}
      {% if not (name starts with '#' or name in ['email', 'profile', 'actions']) %}
        {{ element[name] }}
      {% endif %}
    {% endfor %}