3 files changed, 41 insertions, 0 deletions
diff --git a/parts/django/tests/modeltests/properties/__init__.py b/parts/django/tests/modeltests/properties/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/parts/django/tests/modeltests/properties/__init__.py
diff --git a/parts/django/tests/modeltests/properties/models.py b/parts/django/tests/modeltests/properties/models.py
new file mode 100644
index 0000000..390efe3
--- /dev/null
+++ b/parts/django/tests/modeltests/properties/models.py
@@ -0,0 +1,21 @@
+"""
+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(max_length=30)
+    last_name = models.CharField(max_length=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)
diff --git a/parts/django/tests/modeltests/properties/tests.py b/parts/django/tests/modeltests/properties/tests.py
new file mode 100644
index 0000000..e31ac58
--- /dev/null
+++ b/parts/django/tests/modeltests/properties/tests.py
@@ -0,0 +1,20 @@
+from django.test import TestCase
+from models import Person
+
+class PropertyTests(TestCase):
+
+    def setUp(self):
+        self.a = Person(first_name='John', last_name='Lennon')
+        self.a.save()
+
+    def test_getter(self):
+        self.assertEqual(self.a.full_name, 'John Lennon')
+
+    def test_setter(self):
+        # The "full_name" property hasn't provided a "set" method.
+        self.assertRaises(AttributeError, setattr, self.a, 'full_name', 'Paul McCartney')
+
+        # But "full_name_2" has, and it can be used to initialise the class.
+        a2 = Person(full_name_2 = 'Paul McCartney')
+        a2.save()
+        self.assertEqual(a2.first_name, 'Paul')