Added Descriptor method, fixed order issue.

common/lib/xmodule/xmodule/foldit_module.py

@@ -86,7 +86,10 @@ class FolditModule(XModule):
         """
         from foldit.models import Score
 
-        return [(e['username'], e['score']) for e in Score.get_tops_n(10)]
+        leaders = [(e['username'], e['score']) for e in Score.get_tops_n(10)]
+        leaders.sort(key=lambda x: x[1])
+
+        return leaders
 
     def get_html(self):
         """
@@ -173,7 +176,10 @@ class FolditDescriptor(XmlDescriptor, EditingDescriptor):
 
     @classmethod
     def definition_from_xml(cls, xml_object, system):
-        """
-        Get the xml_object's attributes.
-        """
+        """ Get the xml_object's attributes.  """
+
         return {'metadata': xml_object.attrib}
+
+    def definition_to_xml(self):
+        xml_object = etree.Element('foldit')
+        return xml_object

lms/djangoapps/foldit/models.py

@@ -59,7 +59,7 @@ class Score(models.Model):
         scores = Score.objects \
             .filter(puzzle_id__in=puzzles) \
             .annotate(total_score=models.Sum('best_score')) \
-            .order_by('-total_score')[:n]
+            .order_by('total_score')[:n]
         num = len(puzzles)
 
         return [{'username': s.user.username,