"""

Adding hooks before/after saving and deleting

To execute arbitrary code around ``save()`` and ``delete()``, just subclass

the methods.

"""

from django.db import models

class Person(models.Model):

    first_name = models.CharField(max_length=20)

    last_name = models.CharField(max_length=20)

    def __init__(self, *args, **kwargs):

        super().__init__(*args, **kwargs)

        self.data = []

    def __str__(self):

        return "%s %s" % (self.first_name, self.last_name)

    def save(self, *args, **kwargs):

        self.data.append("Before save")

        # Call the "real" save() method

        super().save(*args, **kwargs)

        self.data.append("After save")

    def delete(self):

        self.data.append("Before deletion")

        # Call the "real" delete() method

        super().delete()

        self.data.append("After deletion")