Added commit_on_success_with_read_committed decorator to views

which raise IntegrityErrors.

TNL-367

common/djangoapps/course_modes/views.py

@@ -17,6 +17,7 @@ from course_modes.models import CourseMode
 from courseware.access import has_access
 from student.models import CourseEnrollment
 from opaque_keys.edx.locations import SlashSeparatedCourseKey
+from util.db import commit_on_success_with_read_committed
 from xmodule.modulestore.django import modulestore
 
 
@@ -121,6 +122,7 @@ class ChooseModeView(View):
         return render_to_response("course_modes/choose.html", context)
 
     @method_decorator(login_required)
+    @method_decorator(commit_on_success_with_read_committed)
     def post(self, request, course_id):
         """Takes the form submission from the page and parses it.
 

common/djangoapps/student/views.py

@@ -79,6 +79,7 @@ import track.views
 
 from dogapi import dog_stats_api
 
+from util.db import commit_on_success_with_read_committed
 from util.json_request import JsonResponse
 from util.bad_request_rate_limiter import BadRequestRateLimiter
 
@@ -616,6 +617,7 @@ def try_change_enrollment(request):
 
 
 @require_POST
+@commit_on_success_with_read_committed
 def change_enrollment(request, auto_register=False, check_access=True):
     """
     Modify the enrollment status for the logged-in user.