Accessing checkbox_name and checkbox_id from ClearableFileInput in template

Using Django Forms & APIs
1

I want to customize a ClearableFileInput and need to access the checkbox_name and checkbox_id from the clearable checkbox.

If I call this field as {{ field }} everything is rendered properly.
I can also access fields like {{ field.field.widget.clear_checkbox_label }} but I tried multiple things to get the name and the id of the clearable checkbox. I would have assumed that {{ field.field.widget.checkbox_name }}` would work, but it does not exist. Same for id.

I already checked the ClearableFileInput class and the corresponding template.

    def get_context(self, name, value, attrs):
        context = super().get_context(name, value, attrs)
        checkbox_name = self.clear_checkbox_name(name)
        checkbox_id = self.clear_checkbox_id(checkbox_name)
        context["widget"].update(
            {
                "checkbox_name": checkbox_name,
                "checkbox_id": checkbox_id,
                "is_initial": self.is_initial(value),
                "input_text": self.input_text,
                "initial_text": self.initial_text,
                "clear_checkbox_label": self.clear_checkbox_label,
            }
        )
        context["widget"]["attrs"].setdefault("disabled", False)
        context["widget"]["attrs"]["checked"] = self.checked
        return context

{% if widget.is_initial %}{{ widget.initial_text }}: <a href="{{ widget.value.url }}">{{ widget.value }}</a>{% if not widget.required %}
<input type="checkbox" name="{{ widget.checkbox_name }}" id="{{ widget.checkbox_id }}"{% if widget.attrs.disabled %} disabled{% endif %}>
<label for="{{ widget.checkbox_id }}">{{ widget.clear_checkbox_label }}</label>{% endif %}<br>
{{ widget.input_text }}:{% endif %}
<input type="{{ widget.type }}" name="{{ widget.name }}"{% include "django/forms/widgets/attrs.html" %}>

and there you can see: name="{{ widget.checkbox_name }}" id="{{ widget.checkbox_id }}"

and in my custom form template I got form and iterate over the form.visible_fields
How can I achieve this? The only way I found was manually adding the suffixes as in ClearableFileInput: name="{{ field.html_name }}-clear" id="{{ field.html_name }}-clear_id"

Update: I found a solution now, but maybe there are better ways:

{{ field.subwidgets.0.data.checkbox_name }}
{{ field.subwidgets.0.data.checkbox_id }}
2

You could override the get_context method in your custom ClearableFileInput widget and add the checkbox_name and checkbox_id to the context.

from django.forms.widgets import ClearableFileInput

class CustomClearableFileInput(ClearableFileInput):
    template_name = 'your_template.html'  
    def get_context(self, name, value, attrs):
        context = super().get_context(name, value, attrs)
        context['checkbox_name'] = self.clear_checkbox_name(name)
        context['checkbox_id'] = self.clear_checkbox_id(context['checkbox_name'])
        return context