make discussions work for new users

common/djangoapps/student/models.py

@@ -51,6 +51,7 @@ from django.dispatch import receiver
 from functools import partial
 
 import comment_client as cc
+from django_comment_client.models import Role, Permission
 
 import logging
 
@@ -174,7 +175,6 @@ class PendingEmailChange(models.Model):
     new_email = models.CharField(blank=True, max_length=255, db_index=True)
     activation_key = models.CharField(('activation key'), max_length=32, unique=True, db_index=True)
 
-
 class CourseEnrollment(models.Model):
     user = models.ForeignKey(User)
     course_id = models.CharField(max_length=255, db_index=True)
@@ -184,6 +184,16 @@ class CourseEnrollment(models.Model):
     class Meta:
         unique_together = (('user', 'course_id'), )
 
+@receiver(post_save, sender=CourseEnrollment)
+def assign_default_role(sender, instance, **kwargs):
+    if instance.user.is_staff:
+        role = Role.objects.get_or_create(course_id=instance.course_id, name="Moderator")[0]
+    else:
+        role = Role.objects.get_or_create(course_id=instance.course_id, name="Student")[0]
+
+    logging.info("assign_default_role: adding %s as %s" % (instance.user, role))
+    instance.user.roles.add(role)
+
 #cache_relation(User.profile)
 
 #### Helper methods for use from python manage.py shell.

lms/djangoapps/django_comment_client/__init__.py

-# call some function from permissions so that the post_save hook is imported
-from permissions import assign_default_role

lms/djangoapps/django_comment_client/base/views.py

@@ -51,7 +51,7 @@ def ajax_content_response(request, course_id, content, template_name):
         'content': content,
     }
     html = render_to_string(template_name, context)
-    user_info = cc.User.from_django_user(request.user).to_dict()
+    user_info = cc.User.from_django_user(request.user).safe_attributes()
     annotated_content_info = utils.get_annotated_content_info(course_id, content, request.user, user_info)
     return JsonResponse({
         'html': html,

lms/djangoapps/django_comment_client/forum/views.py

@@ -64,7 +64,7 @@ def render_discussion(request, course_id, threads, *args, **kwargs):
         'user': (lambda: reverse('django_comment_client.forum.views.user_profile', args=[course_id, user_id])),
     }[discussion_type]()
 
-    user_info = cc.User.from_django_user(request.user).to_dict()
+    user_info = cc.User.from_django_user(request.user).safe_attributes()
 
     def infogetter(thread):
         return utils.get_annotated_content_infos(course_id, thread, request.user, user_info)
@@ -176,7 +176,7 @@ def render_single_thread(request, discussion_id, course_id, thread_id):
     
     thread = cc.Thread.find(thread_id).retrieve(recursive=True).to_dict()
 
-    user_info = cc.User.from_django_user(request.user).to_dict()
+    user_info = cc.User.from_django_user(request.user).safe_attributes()
 
     annotated_content_info = utils.get_annotated_content_infos(course_id, thread=thread, user=request.user, user_info=user_info)
 
@@ -194,7 +194,7 @@ def single_thread(request, course_id, discussion_id, thread_id):
 
     if request.is_ajax():
         
-        user_info = cc.User.from_django_user(request.user).to_dict()
+        user_info = cc.User.from_django_user(request.user).safe_attributes()
         thread = cc.Thread.find(thread_id).retrieve(recursive=True)
         annotated_content_info = utils.get_annotated_content_infos(course_id, thread, request.user, user_info=user_info)
         context = {'thread': thread.to_dict(), 'course_id': course_id}

lms/djangoapps/django_comment_client/management/commands/create_roles_for_existing.py

@@ -6,9 +6,7 @@ Enrollments.
 """
 from django.core.management.base import BaseCommand, CommandError
 
-from student.models import CourseEnrollment
-from django_comment_client.permissions import assign_default_role
-
+from student.models import CourseEnrollment, assign_default_role
 
 class Command(BaseCommand):
     args = 'course_id'

lms/djangoapps/django_comment_client/permissions.py

+import comment_client as cc
+
 from .models import Role, Permission
-from django.contrib.auth.models import User
 from django.db.models.signals import post_save
 from django.dispatch import receiver
 from student.models import CourseEnrollment
@@ -8,16 +9,6 @@ import logging
 from util.cache import cache
 
 
-@receiver(post_save, sender=CourseEnrollment)
-def assign_default_role(sender, instance, **kwargs):
-    if instance.user.is_staff:
-        role = Role.objects.get_or_create(course_id=instance.course_id, name="Moderator")[0]
-    else:
-        role = Role.objects.get_or_create(course_id=instance.course_id, name="Student")[0]
-
-    logging.info("assign_default_role: adding %s as %s" % (instance.user, role))
-    instance.user.roles.add(role)
-
 def cached_has_permission(user, permission, course_id=None):
     """
     Call has_permission if it's not cached. A change in a user's role or

lms/lib/comment_client/user.py

@@ -33,6 +33,16 @@ class User(models.Model):
         params = {'source_type': source.type, 'source_id': source.id}
         response = perform_request('delete', _url_for_subscription(self.id), params)
 
+    # TODO this is a hack to compensate for the fact that synchronization isn't
+    # happening properly.
+    def safe_attributes(self):
+        try: 
+            return self.to_dict()
+        except:
+            self.save()
+            self._retrieve()
+            return self.to_dict()
+
     def vote(self, voteable, value):
         if voteable.type == 'thread':
             url = _url_for_vote_thread(voteable.id)