Override data validation on one django form element

Question

I have a select list dropdown box on my form that is populated with data from a Model (Directors). The value of this dropdown doesn\'t need to be saved; it is really only u

Answer 1

For some reason the accepted answer didn't work for me (don't know if it's cause things have changed, or I'm using an inline form or what), but overriding full_clean worked:

class MyForm(forms.ModelForm):
    def full_clean(self):
        super(MyForm, self).full_clean()
        if self.cleaned_data.get('film') and 'director' in self._errors:
            del self._errors['director']

Answer 2

The easiest approach would be to define your own method for validating the form, like this:

class MyForm(forms.ModelForm):
    class Meta:
        model = WhateverModel

    def clean(self):
        super(MyForm, self).clean() #if necessary
        if self.cleaned_data.get('film') and 'director' in self._errors:
            del self._errors['director']
        return self.cleaned_data                            

See http://docs.djangoproject.com/en/dev/ref/forms/validation/#cleaning-and-validating-fields-that-depend-on-each-other for a more extensive explanation and http://docs.djangoproject.com/en/dev/topics/forms/modelforms/#overriding-the-clean-method for how it applies to ModelForms.