Lazy choices in Django form

Try using a ModelChoiceField instead of a simple ChoiceField. I think you will be able to achieve what you want by tweaking your models a bit. Take a look at the docs for more.

I would also add that ModelChoiceFields are lazy by default :)

You can use the "lazy" function :)

from django.utils.functional import lazy

class CarSearchForm(forms.Form):  
    # lots of fields like this
    bodystyle = forms.ChoiceField(choices=lazy(bodystyle_choices, tuple)())

very nice util function !