Mobile API: use bulk_operation context manager.

lms/djangoapps/mobile_api/utils.py

@@ -5,11 +5,13 @@ Common utility methods and decorators for Mobile APIs.
 
 import functools
 
-from opaque_keys.edx.keys import CourseKey
-from courseware.courses import get_course_with_access
 from rest_framework import permissions
 from rest_framework.authentication import OAuth2Authentication, SessionAuthentication
 
+from opaque_keys.edx.keys import CourseKey
+from xmodule.modulestore.django import modulestore
+from courseware.courses import get_course_with_access
+
 
 def mobile_course_access(depth=0, verify_enrolled=True):
     """
@@ -25,6 +27,7 @@ def mobile_course_access(depth=0, verify_enrolled=True):
             Raises 404 if access to course is disallowed.
             """
             course_id = CourseKey.from_string(kwargs.pop('course_id'))
+            with modulestore().bulk_operations(course_id):
                 course = get_course_with_access(
                     request.user,
                     'load_mobile' if verify_enrolled else 'load_mobile_no_enrollment_check',