Add a fix_not_found command to get rid

of dangling children references to blocks.
TNL-1141

cms/djangoapps/contentstore/management/commands/fix_not_found.py

@@ -0,0 +1,27 @@
+"""
+Script for fixing the item not found errors in a course
+"""
+from django.core.management.base import BaseCommand, CommandError
+from opaque_keys.edx.keys import CourseKey
+from xmodule.modulestore.django import modulestore
+from xmodule.modulestore import ModuleStoreEnum
+
+# To run from command line: ./manage.py cms fix_not_found course-v1:org+course+run
+
+
+class Command(BaseCommand):
+    """Fix a course's item not found errors"""
+    help = "Fix a course's ItemNotFound errors"
+
+    def handle(self, *args, **options):
+        "Execute the command"
+        if len(args) != 1:
+            raise CommandError("requires 1 argument: <course_id>")
+
+        course_key = CourseKey.from_string(args[0])
+        # for now only support on split mongo
+        owning_store = modulestore()._get_modulestore_for_courseid(course_key)
+        if hasattr(owning_store, 'fix_not_found'):
+            owning_store.fix_not_found(course_key, ModuleStoreEnum.UserID.mgmt_command)
+        else:
+            raise CommandError("The owning modulestore does not support this command.")