Raise field error in models clean method

Hello.

How to raise a `ValidationException` in the models `clean` method?

    def clean(self):

        from django.core.exceptions import ValidationError

        raise ValidationError({'title': 'not ok'})

The above does not add the error to the `title` field (when using a form), but to the non field errors.

This is possible inside a form (`self._errors['title'] = self.error_class([msg])`), but `self._errors` does not exist inside the models `clean` method.

I know that clean normally is for non field errors, but there are cases when only some kind of combination of values in separate fields are valid. I want to directly associate the error with a field and let the user know "if you change this field than everything passes".

Is it possible (even if not recommended)?

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