Cloze question type

Template:Multianswer (Cloze) editing interface The code for the multianswer cloze question type is in the directory question/type/multianswer. The name of the questiontype class is class embedded_cloze_qtype extends default_questiontype.

A cloze question is a container for several subquestions. So when you create a simple question like

America was discovered by {1:shortanswer;=Columbus#OK} in {1:NUMERICAL:=1492:0.1#Feedback}}

to be continued Pierre Pichet 17:13, 14 November 2007 (CST)for correct answer We call these subquestions 'wrapped questions'. Most of the methods of this questiontype simply call the corresponding methods of the wrapped questions. So mostly this questiontype class only has to do clever bookkeeping.

The way the questiontype it is implemented at the moment all wrapped questions must be of a type that use a single response field $state->responses[''].

quiz_multianswers database table

The quiz_multianswers table belongs to the multianswer questiontype and is an extension of the quiz_questions table. It merely stores a comma separated list of question ids in the sequence field, which is important, because that's the only way to know which sub question belongs to which position in the questiontext.

id

int(10) unsigned NOT NULL auto_increment,

Primary key

question

int(10) unsigned NOT NULL default '0',

Foreign key refering to the id field in the quiz_questions table

sequence

varchar(255) NOT NULL default ,

A comma separated list of question ids in the order in which they appear in the questiontext.

Response storage model

The multianswer question uses a serialized format consisting of a comma separated list of pairs. Each pair saves the response for one of the subquestions and is itself separated with a hyphen ('-'). In front of the hyphen there is the sequence number of the subquestion (starting at 1). After the hyphen is the raw response, that was submitted by the student. The serialized format could look like the following example:

1-34,2-Napoleon,3-4,4-correct response,5-1

All commas and hyphens that are part of the raw answer are HTML entity encoded to avoid problems.

The fact that the sequence number of the subquestion, rather than the id of the subquestion is used in the response storage is a pity. It could leads to problems when the teacher changes the layout of the cloze question.