+
−"""
+
−22. Using properties on models
+
−
+
−Use properties on models just like on any other Python object.
+
−"""
+
−
+
−from django.db import models
+
−
+
−class Person(models.Model):
+
−    first_name = models.CharField(maxlength=30)
+
−    last_name = models.CharField(maxlength=30)
+
−
+
−    def _get_full_name(self):
+
−        return "%s %s" % (self.first_name, self.last_name)
+
−
+
−    def _set_full_name(self, combined_name):
+
−        self.first_name, self.last_name = combined_name.split(' ', 1)
+
−
+
−    full_name = property(_get_full_name)
+
−
+
−    full_name_2 = property(_get_full_name, _set_full_name)
+
−
+
−__test__ = {'API_TESTS':"""
+
−>>> a = Person(first_name='John', last_name='Lennon')
+
−>>> a.save()
+
−>>> a.full_name
+
−'John Lennon'
+
−
+
−# The "full_name" property hasn't provided a "set" method.
+
−>>> a.full_name = 'Paul McCartney'
+
−Traceback (most recent call last):
+
−    ...
+
−AttributeError: can't set attribute
+
−
+
−# But "full_name_2" has, and it can be used to initialise the class.
+
−>>> a2 = Person(full_name_2 = 'Paul McCartney')
+
−>>> a2.save()
+
−>>> a2.first_name
+
−'Paul'
+
−"""}