Add script for removing anonymous users from classrooms

scripts/mongodb/migrations/2016-05-31-remove-anon-classroom-members.js

@@ -0,0 +1,43 @@
+// Usage: Copy and paste into mongo shell
+
+function removeAnonymousMembers(classroom) {
+  if(!classroom.members) {
+    return;
+  }
+
+  print('checking classroom',
+    classroom._id,
+    '\n\t',
+    classroom._id.getTimestamp(),
+    classroom.members.length,
+    'owner', classroom.ownerID);
+
+  classroom.members.forEach(function(userID) {
+    var user = db.users.findOne({_id: userID}, {anonymous:1});
+    if (!user) {
+      return;
+    }
+    if(user.anonymous) {
+      print('\tRemove user', JSON.stringify(user));
+
+      print('\t\tRemoving from course instances',
+        db.course.instances.update(
+          {classroomID: classroom._id},
+          {$pull: {members: userID}})
+      );
+
+      print('\t\tRemoving from classroom',
+        db.classrooms.update(
+          {_id: classroom._id},
+          {$pull: {members: userID}})
+      );
+    }
+  });
+}
+
+var startID = ObjectId('566838b00fb44a2e00000000');
+while (true) {
+  var classroom = db.classrooms.findOne({_id: {$gt: startID}});
+  removeAnonymousMembers(classroom);
+  startID = classroom._id;
+}