--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/parts/django/tests/modeltests/custom_methods/models.py	Sat Jan 08 11:20:57 2011 +0530
@@ -0,0 +1,36 @@
+"""
+3. Giving models custom methods
+
+Any method you add to a model will be available to instances.
+"""
+
+from django.db import models
+import datetime
+
+class Article(models.Model):
+    headline = models.CharField(max_length=100)
+    pub_date = models.DateField()
+
+    def __unicode__(self):
+        return self.headline
+
+    def was_published_today(self):
+        return self.pub_date == datetime.date.today()
+
+    def articles_from_same_day_1(self):
+        return Article.objects.filter(pub_date=self.pub_date).exclude(id=self.id)
+
+    def articles_from_same_day_2(self):
+        """
+        Verbose version of get_articles_from_same_day_1, which does a custom
+        database query for the sake of demonstration.
+        """
+        from django.db import connection
+        cursor = connection.cursor()
+        cursor.execute("""
+            SELECT id, headline, pub_date
+            FROM custom_methods_article
+            WHERE pub_date = %s
+                AND id != %s""", [connection.ops.value_to_db_date(self.pub_date),
+                                  self.id])
+        return [self.__class__(*row) for row in cursor.fetchall()]