Accessing the time where a field has been updated (Django models)

Question

I need to create a system where the user have to change his password every "x" number of days. I managed to achieve this by saving a UTC timestamp representing the time when the user has created/modified his password.

My question is, instead of saving the timestamp in the database, is it possible to get a timestamp representing the time when the field has been changed through some of django's built-in functions? This way I could access when was the last time the user has updated his password without having to add a dedicated field in the model to save the timestamp in it.

Answer 1

No, there is no field that shows you which field updated in which time, you should implement it your self

you should use set_password everywhere to manage update password time

password_updated_at = models.DateTimeField(_('password updated at'))

def set_password(self, raw_password):
    r = super(User, self).set_password(raw_password=raw_password)
    self.password_updated_at = timezone.now()
    self.save()
    return r

def is_password_updated_at_expired(self):
    duration = (timezone.now() - self.password_updated_at).total_seconds()
    return duration > settings.PASSWORD_UPDATE_EXPIRE_TIME, duration