Added a most common method to tags managers

taggit/managers.py

@@ -51,3 +51,8 @@ class _TaggableManager(models.Manager):
     def clear(self):
         TaggedItem.objects.filter(object_id=self.object_id,
             content_type=ContentType.objects.get_for_model(self.model)).delete()
+    
+    def most_common(self):
+        return self.get_query_set().annotate(
+            num_times=models.Count('items')
+        ).order_by('-num_times')

taggit/tests/tests.py

@@ -27,6 +27,8 @@ class AddTagTestCase(BaseTaggingTest):
         self.assert_tags_equal(apple.tags.all(), ['green', 'red'])
         self.assert_tags_equal(Food.tags.all(), ['green', 'red'])
         
+        self.assert_tags_equal(Food.tags.most_common(), ['green', 'red'])
+        
         apple.tags.remove('green')
         self.assert_tags_equal(apple.tags.all(), ['red'])
         self.assert_tags_equal(Food.tags.all(), ['green', 'red'])