[1.2.X] Fixed #11058 - list_display_links doesn't allow callables not defined in the model

Thanks to dvine for the report and julien for the patch.

Backport of [15619] from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@15621 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/modeladmin/models.py

@@ -8,7 +8,7 @@ class Band(models.Model):
     name = models.CharField(max_length=100)
     bio = models.TextField()
     sign_date = models.DateField()
-    
+
     def __unicode__(self):
         return self.name
 
@@ -32,5 +32,8 @@ class ValidationTestModel(models.Model):
     pub_date = models.DateTimeField()
     band = models.ForeignKey(Band)
 
+    def decade_published_in(self):
+        return self.pub_date.strftime('%Y')[:3] + "0's"
+
 class ValidationTestInlineModel(models.Model):
     parent = models.ForeignKey(ValidationTestModel)