To check if a field has changed when saving with Python Django, we can override the `init method of the model class to keep a copt of the original value.
For instance, we write
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:
super().save(force_insert, force_update, *args, **kwargs)
self.__original_name = self.name
to add the __init__ method that sets the __original_name variable to self.name to keep the original name value.
And then in the if block in save, we check self.name to see if it’s different from self.__original_name to see if it’s saved with a new value.
