E736. Undo Functionality for Expertiza

Contacts: Ed Gehringer (efg@ncsu.edu) and Andrew Kofink (ajkofink@ncsu.edu)
Begin implementing SQL transactions (ActiveRecord:Transactions). This should let the user "roll back" any creation or update of a SQL table (assignments, rubrics, etc.) Several issues arise, that you should discuss with me.
- Should students be able to roll back, e.g., submissions or reviews?
- Suppose an instructor is trying to roll back and a TA is editing the same assignment? How can conflicts be presented?
- Do rollbacks affect only what's in the db, or do they also affect submitted files?

Team Members

Undo should cover any edit functionalities and any submissions of links. File submissions do not need to be included for the scope of this project.
User should be able to undo any changes to an item (such as course or assignment) as long as no other user has edited that same item within the user's current session.
If undo is attempted on an item already modified by another user, display a message stating why undo cannot be done.

Paper Trail(https://github.com/airblade/paper_trail)
- PaperTrail lets you track changes to your models' data. It's good for auditing or versioning. You can see how a model looked at any stage in its lifecycle, revert it to any version, and even undelete it after it's been destroyed.
- There is a Railscast shows how to implement undo feature with Paper Trail
- It is ranked as the most popular framework for Active Record versioning feature in here[1]