Comprobar si un campo de un modelo ha cambiado

Fuentes

• http://stackoverflow.com/a/1793323

---

class Person(models.Model):
    name = models.CharField()

    __original_name = None

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.__original_name = self.name

    def save(self, force_insert=False, force_update=False, *args, **kwargs):
        if self.name != self.__original_name:
            # name changed - do something here

        super().save(force_insert, force_update, *args, **kwargs)
        self.__original_name = self.name