Followed style guide for model attribute ordering.

tests/fixtures_model_package/models/__init__.py

@@ -5,9 +5,9 @@ class Article(models.Model):
     headline = models.CharField(max_length=100, default='Default headline')
     pub_date = models.DateTimeField()
 
-    def __str__(self):
-        return self.headline
-
     class Meta:
         app_label = 'fixtures_model_package'
         ordering = ('-pub_date', 'headline')
+
+    def __str__(self):
+        return self.headline