Add course-correction migration script

scripts/mongodb/migrations/2015-11-10-course-correction.js

@@ -0,0 +1,34 @@
+var counts = {
+  hasClassroom: 0,
+  isOwn: 0,
+  migrated: 0
+};
+
+// script for generating codes
+// JSON.stringify(_.unique(_.map(_.range(1000), function() { return _.sample("abcdefghijklmnopqrstuvwxyz0123456789", 8).join('') })))
+var codes = 
+db.course.instances.find().forEach(function(courseInstance) {
+  if(courseInstance.classroomID) {
+    counts.hasClassroom += 1;
+    return;
+  }
+  if(courseInstance.ownerID && courseInstance.members && courseInstance.ownerID.equals(courseInstance.members[0]) && courseInstance.members.length === 1) {
+    counts.isOwn += 1;
+    return;
+  }
+
+  var id = ObjectId();
+
+  var newClassroom = {
+    members: courseInstance.members,
+    ownerID: courseInstance.ownerID,
+    description: courseInstance.description,
+    name: courseInstance.name,
+    code: codes.pop(),
+    _id: id
+  };
+  print('migrating', JSON.stringify(newClassroom, null, '\t'));
+  db.classrooms.save(newClassroom);
+  courseInstance.classroomID = id;
+  db.course.instances.save(courseInstance);
+});