1 """

     2 13. Adding hooks before/after saving and deleting

     3 

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

     5 the methods.

     6 """

     7 

     8 from django.db import models

     9 

    10 

    11 class Person(models.Model):

    12     first_name = models.CharField(max_length=20)

    13     last_name = models.CharField(max_length=20)

    14 

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

    16         super(Person, self).__init__(*args, **kwargs)

    17         self.data = []

    18 

    19     def __unicode__(self):

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

    21 

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

    23         self.data.append("Before save")

    24          # Call the "real" save() method

    25         super(Person, self).save(*args, **kwargs)

    26         self.data.append("After save")

    27 

    28     def delete(self):

    29         self.data.append("Before deletion")

    30         # Call the "real" delete() method

    31         super(Person, self).delete()

    32         self.data.append("After deletion")