Calculated multiquestions proposal

This page will be used to document and structure a project of adding multiquestion capability to the calculated question like the cloze questiontype and allowing the calculated questions to be used as usual calculated question or as multiplechoice question.

Intro

This imply developping a structure similar to the multiquestion i.e adding calculated questions records with the main question as parent. An additional multiplechoice record is necessary to each calculated question.

Actually (august 2007) the general interface to create and edit this improved calculated questiontype is almost completed. The real difficulties are to modify the code related to grade each subquestion and store the session and responses parameters. If we only allowed single response multichoice question, the code will be a quite straightforward version of the multiquestion one.

Question Object structure

Here is the proposed structure of the question object after calling get_question_options records

• main mdl_question
  • for each subquestion an mdl_question with the parent field set to main->id
    • for each mdl_question record
      • a mdl_question_calculated and
      • a mdl_question_multichoice

The usual answers records for each question and subquestion All the datasets, data_items records are associated with the main question All these data are structure like the following example. Probably to simplify the code the main question (#0) data will be repeated in the subquestions

stdClass Object
(
   [category] => 1
   [parent] => 0
   [name] => my first multichoice
   [questiontext] => What is the surface of a rectangle of {h} m by {l} m ?
{#0}
What is the perimeter of this rectangle?
{#1}
   [questiontextformat] => 1
   [image] => 
   [generalfeedback] => 
   [defaultgrade] => 1
   [penalty] => 0.1
   [qtype] => calculated
   [length] => 1
   [stamp] => 132.208.141.198+070613190851+gCcidQ
   [version] => 132.208.141.198+070812043753+37cXs7
   [hidden] => 0
   [id] => 382
   [maxgrade] => 1
   [name_prefix] => resp382_
   [options] => stdClass Object
       (
           [answers] => Array
               (
                   [1141] => stdClass Object
                       (
                           [question] => 382
                           [answer] => {h}* {l}
                           [fraction] => 1
                           [feedback] => OK
                           [tolerance] => 0.01
                           [tolerancetype] => 1
                           [correctanswerlength] => 2
                           [correctanswerformat] => 1
                           [id] => 1141
                       )
                   [1142] => stdClass Object
                       (
                           [question] => 382
                           [answer] => 2*({h}+{l})
                           [fraction] => 0.5
                           [feedback] => You give me the perimeter !
                           [tolerance] => 0.01
                           [tolerancetype] => 1
                           [correctanswerlength] => 2
                           [correctanswerformat] => 1
                           [id] => 1142
                       )
                   [1143] => stdClass Object
                       (
                           [question] => 382
                           [answer] => {rr}
                           [fraction] => 0
                           [feedback] => Go back and try again
                           [tolerance] => 0.01
                           [tolerancetype] => 1
                           [correctanswerlength] => 2
                           [correctanswerformat] => 1
                           [id] => 1143
                       )
               )
           [multichoice] => stdClass Object
               (
                   [id] => 257
                   [question] => 382
                   [layout] => 0
                   [answers] => 0
                   [single] => 1
                   [shuffleanswers] => 1
                   [correctfeedback] => 
                   [partiallycorrectfeedback] => 
                   [incorrectfeedback] => 
                   [answernumbering] => abc
               )
           [subquestions] => Array
               (
                   [383] => stdClass Object
                       (
                           [category] => 1
                           [parent] => 382
                           [name] => {#1}
                           [questiontext] => {#1}
                           [questiontextformat] => 1
                           [image] => 
                           [generalfeedback] => 
                           [defaultgrade] => 1
                           [penalty] => 0.1
                           [qtype] => calculated
                           [length] => 1
                           [stamp] => 132.208.141.198+070613203735+MrdwQ3
                           [version] => 132.208.141.198+070812043754+Os3B8Z
                           [hidden] => 0
                           [id] => 383
                           [options] => stdClass Object
                               (
                                   [answers] => Array
                                       (
                                           [1144] => stdClass Object
                                               (
                                                   [question] => 383
                                                   [answer] => 2*({h}+{l})
                                                   [fraction] => 1
                                                   [feedback] => OK 1
                                                   [tolerance] => 0.01
                                                   [tolerancetype] => 1
                                                   [correctanswerlength] => 0
                                                   [correctanswerformat] => 1
                                                   [id] => 1144
                                               )
                                       )
                                   [multichoice] => stdClass Object
                                       (
                                           [id] => 258
                                           [question] => 383
                                           [layout] => 0
                                           [answers] => 0
                                           [single] => 0
                                           [shuffleanswers] => 1
                                           [correctfeedback] => 
                                           [partiallycorrectfeedback] => 
                                           [incorrectfeedback] => 
                                           [answernumbering] => abc
                                       )
                                   [units] => Array
                                       (
                                       )
                               )
                           [editasmultichoice] => 0
                       )
               )
           [units] => Array
               (
               )
       )
   [editasmultichoice] => 0
)