Add command to seed forum permissions to existing users

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

+"""
+This must be run only after seed_permissions_roles.py!
+
+Creates default roles for all users currently in the database. Just runs through
+Enrollments.
+"""
+from django.core.management.base import BaseCommand, CommandError
+
+from student.models import CourseEnrollment
+from django_comment_client.permissions import assign_default_role
+
+
+class Command(BaseCommand):
+    args = 'course_id'
+    help = 'Seed default permisssions and roles'
+
+    def handle(self, *args, **options):
+        if len(args) != 0:
+            raise CommandError("This Command takes no arguments")
+
+        print "Updated roles for ",
+        for i, enrollment in enumerate(CourseEnrollment.objects.all(), start=1):
+            assign_default_role(None, enrollment)
+            if i % 1000 == 0:
+                print "{0}...".format(i),
+        print
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