Django: How to change a field widget in a Inline Formset

Question

I am new to Django and I think I am missing this in the docs.
The problem is that in inline-formset I dont declare a form, just pass two models to construct it.
I want

Answer 1

This is an example of customizing one field using formfield_callback:

def formfield_callback(field):
    if isinstance(field, models.ChoiceField) and field.name == 'target_field_name':
        return fields.ChoiceField(choices = SAMPLE_CHOICES_LIST, label='Sample Label')
    return field.formfield()

FormSet = inlineformset_factory(ModelA, ModelB, extra=1, formfield_callback = formfield_callback)