E2372. Reimplement QuizQuestion and its child classes

[SuddyN]

Note

Successor: #2687

Problem

There are four methods in QuizQuestion super class. edit, view_question_text, view_completed_question, and complete. These 4 (model) methods will return different html strings depends on the question type.

• edit What to display` - if an instructor (etc.) is creating or editing a questionnaire (questionnaires_controller.rb)
• view_question_text - What to display if an instructor (etc.) is viewing a questionnaire (questionnaires_controller.rb)
• complete What to display - if a student is filling out a questionnaire (response_controller.rb)
• view_completed_question - What to display if a student is viewing a filled-out questionnaire (response_controller.rb)

However, MultipleChoiceCheckbox, MultipleChoiceRadio, and TrueFalse classes all contain a method called isvalid method, which should be included in QuizQuestions class as well.

What you should do:

• Please make a complete UML diagram for these classes with their attributes, methods, and class methods.
• Check all implementations of instance methods, extract duplicated codes, and put them into the highest-level class.
• Thoroughly test the QuizQuestion class.

Solution

• adds isvalid() to QuizQuestion
• implements edit() within QuizQuestion
• Reimplements QuizQuestion class and child classes methods to use @html instead of html

UML Diagram

Review responsibilities

• reimplementation pair-programed by @opheliasin and @yi15922, reviewed by @SuddyN
• UML designed by @SuddyN reviewed by @opheliasin and @yi15922