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Asked: 2026-05-23T10:29:13+00:00

This should be pretty straightforward but I’m not figuring it out from the Django

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This should be pretty straightforward but I’m not figuring it out from the Django documentation. I have an IntegerField Model Field from which I’ve created a ModelForm Field. The field in question contains $ values (price) and it would be preferable from a UX standpoint if the user did not receive a error message (‘enter whole number’) when they input $10 instead of 10.

I’ve tried manual form cleaning but it seems that the clean_field method is run after other validation methods. My reading so far seems to confirm that as well. 

    def clean_bill(self):
          bill = self.cleaned_data["bill"]
          if '$' in bill:
              bill=bill.replace('$','',1)   
          return bill

Is there a way around this while maintaining the IntegerField in the modelform? Should I just make it a RegexField?

EDIT: I ended up going with a combination of the above and a RegexField. Still curious if there is another/better way.

        bill= forms.RegexField(label=_("Bill"), max_length=10,required=True, regex=r'^\$?[\d]+$',
    error_messages = {'invalid': _("Please enter a whole number.")})
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1 Answer

  1. Editorial Team

    Create an IntegerField in the model, and a CharField in the form.

    You can still use modelform to do this but you’ll have to:

    1. ‘exclude’ the model field from the form,
    2. write a clean_bill method in the form
    3. set the value of the model’s field to the parsed integer value

    try this and/or this

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