Monitoring the initial values of Django objects

gistfile1.py

class Foo(models.Model):
    bar = models.CharField(max_length=50)

    def __init__(self, *args, **kwargs):
        self.bar_initial = self.bar
        super(Foo, self).__init__(*args, **kwargs)

    def save(self, *args, **kwargs):
        if self.bar == self.bar_initial:
            do_stuff()
        else:
            do_other_stuff()
        super(Foo, self).save(*args, **kwargs)