RUBERIC: QuizQuestionnaire checks

[jamcdon4]

There are three checks for whether a questionnaire is a QuizQuestionnaire. Testing the class of an object is always suspect, though in a controller, which has to control a whole hierarchy of objects, it is not necessarily wrong. However, they probably aren’t necessary.

• One of the checks is in create_questionnaire. [method may be removed]

• One of them deals with weights for a question, which is a kludge or hack, since managing weights should really be done in the model (superclass Questionnaire or subclass QuizQuestionnaire).

• The third check has something to do with TreeNodes, which are Expertiza’s way of displaying objects (such as courses and assignments) that need to be shown in a hierarchy. It’s not clear what’s going on here, but I doubt that QuizQuestionnaire really has to be special.