Identify the changed fields in django post_save signal

Question

I\'m using django\'s post_save signal to execute some statements after saving the model.

class Mode(models.Model):
    name = models.CharField(max_length=5)
         


        

Answer 1

You can use update_fields in django signals.

@receiver(post_save, sender=Mode)
def post_save(sender, instance, created, **kwargs):

    # only update instance
    if not created:

        update_fields = kwargs.get('update_fields') or set()

        # value of `mode` has changed:
        if 'mode' in update_fields:
            # then do this
            pass
        else:
            # do that
            pass