def add_vacation(self, date_start, date_end, comment_user=None):
try:
self.vacation = Vacation(user=self.user,
date_start=date_start,
date_end=date_end,
comment_user=comment_user)
self.vacation.save()
except (ValidationError, ValueError, TypeError) as e:
if isinstance(e, ValidationError):
msg = e.message_dict
else:
msg = e.args[0]
raise ServiceException(msg)
return self.vacation
