You may recall that the our Controller never defined the Update operation. That's because I resisted hogging all the fun, and left it to you as an exercise for the assignment. In addition the assignment will have you implement another class that can be stored in our ObjectServer, e.g. a Riddle class or FamousProgrammer or other simple class of your choice.
Use these modules as your starting points.
Read the version histories to see how they are changed from the previous versions you worked with. For the most part the changes are small, but they generally include:
As you change them be sure to save archival copies and to record your changes in version comments.