Symfony twig div - html

Question

I made a form with the FormBuilder of Symfony.
When I put my form in twig, the form_start(form) and form_end(form), it add a tag for each input.
I don't understand why twig adds a tag.
What is the solution to remove this tag
Thanks for your answer :)
Also, my formbuilder is like that :
->add('title', TextType::class, array(
'label'=>false,
'attr'=>array('autofocus'=>true)
))
my twig is like that :
{{ form_start(form) }}
<div class="row">
<div class="col-sm-9 p-1">
{{ form_row(form_record.title, {'attr':{'class':"form-control", 'placeholder':"Description"|trans, 'title':"Description"|trans }}) }}
{{ form_errors(form_record.title) }}
</div>
<div class="col-sm-1 pt-2">
<button type="submit" class="btn btn-success btn-circle btn-sm">
<i class="fas fa-plus"></i>
</button>
</div>
</div>
{{ form_end(form) }}
and the result in the html source code is :
<div class="row">
<div class="col-sm-9 p-1">
<div>
<input type="text" id="app__title" name="app_[title]" required="required" class="form-control" placeholder="Description" title="Description">
</div>
</div>
</div>
So Twig add the
<div>
that I don't want. How can I remove this autocompleted tag?
I tried the
{% do form_record.title.set rendered %}
but maybe I think that it does not work.

Answer 1

Edit: Okay it seems I misunderstood the issue at first.
I thought you wanted to hide a field you had in your form which can be done with
{% do form.myField.setRendered %}
Now that I understand the issue, I believe it comes from the way your field is being printed.
There are 3 main components to a form field.
Label: form_label(form.field)
Widget: form_widget(form.field)
Errors: form_errors(form.field)
There is a way to print all three components at once. The function is
form_row(form.field)
Here comes the culprit: form_row(). Because it normally prints 3 different components, it adds a div around it!
Futhermore, by looking at the form type and seing 'label' => false, I can say that the label was printing at first using form_row.
To avoid having to define 'label'=>false everytime, you can simply print your form field in this manner:
{{ form_widget(form_record.title, {'attr':{'class':"form-control", 'placeholder':"Description"|trans, 'title':"Description"|trans }}) }}
{{ form_errors(form_record.title) }}
You can simply omit {{form_label(form_record.title)}} and it won't print.
On the other hand, I also noticed something that might be okay but seem wrong with the given example.
In the twig you shared, the form starts with {{ form_start(form) }} but then the field is {{ form_row(form_record.title)}}.
From where I come from form_record is undefined here. I would use {{ form_row(form.title)}}
Anyways, the explanation for the difference between form_row and form_widget can be found here: Symfony form differences between row and widget
Enjoy!