Warnings (or even info messages) instead of only errors in Django

Question

Does the concept of severity exist in Django\'s form validation or is it only errors?

Also, how about suppressing warnings/errors?

Answer 1

I had a similar requirement in my Django Admin app. I needed to get a confirmation from the user before saving a possibly duplicate entry. I used the error message itself for this as a workaround. In the message, i added a hidden HTML input. On saving a second time, this input appeared in the form data, in which case i went ahead with saving skipping the warning.

def MyForm(forms.ModelForm):
    def clean(self):
        if (not self.instance.id and # check only new entries
            'warn_possible_duplicate' not in self.data): # on first save this is true
            # check if possible duplicate
            if possible_duplicate:
                self.add_error('dup_field', format_html(
                    'Similar entry already exists.'
                    ' To add the new entry anyway, please save again.'
                    ''        # so it's returned in form `data` on second save
                ))

Any possible flaws with this? Any better suggestions?