How to use the faculty.models.CareerEvent.objects.not_deleted function in faculty

def teaching_events(self, semester):
        """Returns all active affects_teaching events that are in effect during the semester."""
        career_events = (CareerEvent.objects.not_deleted()
                                            .overlaps_semester(semester)
                                            .filter(person=self.person)
                                            .filter(flags=CareerEvent.flags.affects_teaching)
                                            .filter(status='A'))
        return career_events

def salary_events(self, date, unit=None):
        """Returns all active affects_salary events that are in effect on date."""
        career_events = (CareerEvent.objects.not_deleted()
                                            .effective_date(date)
                                            .filter(person=self.person)
                                            .filter(flags=CareerEvent.flags.affects_salary)
                                            .filter(status='A'))
        if unit:
            career_events = career_events.filter(unit=unit)
        return career_events

def summary(request, userid):
    """
    Summary page for a faculty member.
    """
    person, _ = _get_faculty_or_404(request.units, userid)
    editor = get_object_or_404(Person, userid=request.user.username)
    career_events = CareerEvent.objects.not_deleted().only_subunits(request.units).filter(person=person)
    filterform = EventFilterForm()

    context = {
        'person': person,
        'editor': editor,
        'career_events': career_events,
        'filterform': filterform,
        'can_wizard': not career_events.exclude(event_type='GRANTAPP').exists(),
    }
    return render(request, 'faculty/summary.html', context)