Editing Forms With Checkboxes For Each Entity in Symfony (section)

== Template ==

<syntaxhighlight lang="twig">
{{ form_start(form) }}
{{ form_errors(form) }}
<button type="submit" class="btn btn-default" name="form[update]">save selected</button>
{% for tutorial in tutorials %}
{{ form_widget(form.tutorialId[loop.index0] ) }}
{% endfor %}
<button type="submit" class="btn btn-default" name="form[update]">save selected</button>
{% do form.update.setRendered %}{# compensates for manually inserting this multiple times in the form #}
{{ form_end(form) }}
</syntaxhighlight>

# The checkboxes are rendered with `form_widget()`.
## `tutorialId` corresponds to the index of the checkbox collection added to the form builder object.
## The individual checkboxes in the collection are accessed through a numeric index. Twig provides the `loop.index0` helper.
# The html for the submit buttons are is manually inserted into the template. The Symfony helper functions will only render a form element once to avoid duplicate `id` values.
# `form_end()` will render any fields that have not explicitly rendered in the form already. `form.update.setRendered` prevents this.