def clean_fields(self, *args, **kwargs): validate_partial_date(self, ['start', 'termination']) validate_is_not_alias(self, ['person', 'supervisor', 'predecessor', 'school']) validate_at_most_n(self, 1, ['school', 'organization_name', 'court']) validate_exactly_n(self, 1, ['position_type', 'job_title']) validate_all_or_none(self, ['votes_yes', 'votes_no']) validate_all_or_none(self, ['votes_yes_percent', 'votes_no_percent']) validate_not_all(self, ['votes_yes', 'votes_no', 'votes_yes_percent', 'votes_no_percent']) validate_nomination_fields_ok(self) validate_supervisor(self) super(Position, self).clean_fields(*args, **kwargs)