Fix queries and some controller query stuff

lms/djangoapps/courseware/tabs.py

@@ -168,7 +168,7 @@ def _combined_open_ended_grading(tab, user, course, active_page):
         user_is_staff  = has_access(user, course, 'staff')
 
         min_time_to_query = user.last_login
-        last_module_seen = StudentModule.objects.all(student=user, course_id = course_id, modified>min_time_to_query).values('modified').order_by('-modified')[0]
+        last_module_seen = StudentModule.objects.all(student=user, course_id = course_id, modified__gt=min_time_to_query).values('modified').order_by('-modified')[0]
 
         last_time_viewed = last_module_seen['modified']
         pending_grading= False

lms/djangoapps/open_ended_grading/controller_query_service.py

@@ -16,7 +16,7 @@ class ControllerQueryService(GradingService):
     Interface to staff grading backend.
     """
     def __init__(self, config):
-        super(ControllerQuery, self).__init__(config)
+        super(ControllerQueryService, self).__init__(config)
         self.check_eta_url = self.url + '/get_submission_eta/'
         self.is_unique_url = self.url + '/is_name_unique/'
         self.combined_notifications_url = self.url + '/combined_notifications/'