Update 12/3 RC branch with the part of the hotfix we want permanently.

common/djangoapps/student/models.py

@@ -20,7 +20,7 @@
 from django.conf import settings
 from django.contrib.auth.models import User
 from django.contrib.auth.signals import user_logged_in, user_logged_out
-from django.db import models
+from django.db import models, IntegrityError
 from django.db.models.signals import post_save
 from django.dispatch import receiver
 import django.dispatch
@@ -53,7 +53,7 @@ class AnonymousUserId(models.Model):
     http://docs.python.org/2/library/md5.html#md5.digest_size
     """
     user = models.ForeignKey(User, db_index=True)
-    anonymous_user_id = models.CharField(unique=True, max_length=16)
+    anonymous_user_id = models.CharField(unique=True, max_length=32)
     course_id = models.CharField(db_index=True, max_length=255)
     unique_together = (user, course_id)
 
@@ -74,12 +74,30 @@ def anonymous_id_for_user(user, course_id):
     hasher.update(settings.SECRET_KEY)
     hasher.update(str(user.id))
     hasher.update(course_id)
+    digest = hasher.hexdigest()
 
-    return AnonymousUserId.objects.get_or_create(
-        defaults={'anonymous_user_id': hasher.hexdigest()},
-        user=user,
-        course_id=course_id
-    )[0].anonymous_user_id
+    try:
+        anonymous_user_id, created = AnonymousUserId.objects.get_or_create(
+            defaults={'anonymous_user_id': digest},
+            user=user,
+            course_id=course_id
+        )
+        if anonymous_user_id.anonymous_user_id != digest:
+            log.error(
+                "Stored anonymous user id {stored!r} for user {user!r} "
+                "in course {course!r} doesn't match computed id {digest!r}".format(
+                    user=user,
+                    course=course_id,
+                    stored=anonymous_user_id.anonymous_user_id,
+                    digest=digest
+                )
+            )
+    except IntegrityError:
+        # Another thread has already created this entry, so
+        # continue
+        pass
+
+    return digest
 
 
 def user_by_anonymous_id(id):

common/lib/xmodule/xmodule/lti_module.py

@@ -89,6 +89,7 @@ class LTIFields(object):
     open_in_a_new_page = Boolean(help="Should LTI be opened in new page?", default=True, scope=Scope.settings)
     graded = Boolean(help="Grades will be considered in overall score.", default=False, scope=Scope.settings)
     weight = Float(help="Weight for student grades.", default=1.0, scope=Scope.settings)
+    has_score = Boolean(help="Does this LTI module have score?", default=False, scope=Scope.settings)
 
 
 class LTIModule(LTIFields, XModule):
@@ -375,7 +376,7 @@ def oauth_params(self, custom_parameters, client_key, client_secret):
         return params
 
     def max_score(self):
-        return self.weight
+        return self.weight if self.has_score else None
 
 
     @XBlock.handler
@@ -581,6 +582,5 @@ class LTIDescriptor(LTIFields, MetadataOnlyEditingDescriptor, EmptyDataRawDescri
     """
     Descriptor for LTI Xmodule.
     """
-    has_score = True
     module_class = LTIModule
     grade_handler = module_attr('grade_handler')

common/lib/xmodule/xmodule/tests/test_lti_unit.py

@@ -194,6 +194,7 @@ def test_good_request(self):
         Response from Tool Provider is correct.
         """
         self.xmodule.verify_oauth_body_sign = Mock()
+        self.xmodule.has_score = True
         request = Request(self.environ)
         request.body = self.get_request_body()
         response = self.xmodule.grade_handler(request, '')
@@ -249,3 +250,16 @@ def test_verify_oauth_body_sign(self):
     def test_client_key_secret(self):
         pass
 
+    def test_max_score(self):
+        self.xmodule.weight = 100.0
+
+        self.xmodule.graded = True
+        self.assertEqual(self.xmodule.max_score(), None)
+
+        self.xmodule.has_score = True
+        self.assertEqual(self.xmodule.max_score(), 100.0)
+
+        self.xmodule.graded = False
+        self.assertEqual(self.xmodule.max_score(), 100.0)
+
+

lms/djangoapps/courseware/features/lti.feature

@@ -44,8 +44,8 @@ Feature: LMS.LTI component
   Scenario: Graded LTI component in LMS is correctly works
   Given the course has correct LTI credentials
   And the course has an LTI component with correct fields:
-  | open_in_a_new_page | weight | is_graded |
-  | False              | 10     | True      |
+  | open_in_a_new_page | weight | is_graded | has_score |
+  | False              | 10     | True      | True |
   And I submit answer to LTI question
   And I click on the "Progress" tab
   Then I see text "Problem Scores: 5/10"

lms/templates/instructor/staff_grading.html

@@ -22,9 +22,10 @@
 <h1>${_("Staff grading")}</h1>
 <div class="breadcrumbs"></div>
 <div class="error-container"></div>
+
 <div class="message-container"></div>
 
-<! -- Problem List View -->
+<!-- Problem List View -->
 <section class="problem-list-container">
   <h2>${_("Instructions")}</h2>
   <div class="instructions">

lms/templates/open_ended_problems/combined_notifications.html

@@ -16,6 +16,7 @@
 <section class="container">
     <div class="combined-notifications" data-ajax_url="${ajax_url}">
         <div class="error-container">${error_text}</div>
+
         <h1>${_("Open Ended Console")}</h1>
         <h2>${_("Instructions")}</h2>
         <p>${_("Here are items that could potentially need your attention.")}</p>

lms/templates/open_ended_problems/open_ended_flagged_problems.html

@@ -19,6 +19,7 @@
 <section class="container">
     <div class="open-ended-problems" data-ajax_url="${ajax_url}">
         <div class="error-container">${error_text}</div>
+
         <h1>${_("Flagged Open Ended Problems")}</h1>
         <h2>${_("Instructions")}</h2>
         <p>${_("Here are a list of open ended problems for this course that have been flagged by students as potentially inappropriate.")}</p>

lms/templates/open_ended_problems/open_ended_problems.html

@@ -48,4 +48,4 @@ <h2>${_("Instructions")}</h2>
         %endif
         %endif
     </div>
-</section>
+</section>

requirements/edx/github.txt

@@ -15,7 +15,7 @@
 -e git+https://github.com/eventbrite/zendesk.git@d53fe0e81b623f084e91776bcf6369f8b7b63879#egg=zendesk
 
 # Our libraries:
--e git+https://github.com/edx/XBlock.git@341d162f353289cfd3974a4f4f9354ce81ab60db#egg=XBlock
+-e git+https://github.com/edx/XBlock.git@c54c63cf8294c54512887e6232d4274003afc6e3#egg=XBlock
 -e git+https://github.com/edx/codejail.git@0a1b468#egg=codejail
 -e git+https://github.com/edx/diff-cover.git@v0.2.6#egg=diff_cover
 -e git+https://github.com/edx/js-test-tool.git@v0.1.4#egg=js_test_tool