/**
* Create a question_attempt_with_restricted_history
* @param question_attempt $baseqa The question_attempt to make a restricted version of.
* @param int $lastseq the index of the last step to include.
* @param string $preferredbehaviour the preferred behaviour. It is slightly
* annoyting that this needs to be passed, but unavoidable for now.
*/
public function __construct(question_attempt $baseqa, $lastseq, $preferredbehaviour)
{
$this->baseqa = $baseqa->get_full_qa();
if ($lastseq < 0 || $lastseq >= $this->baseqa->get_num_steps()) {
throw new coding_exception('$lastseq out of range', $lastseq);
}
$this->steps = array_slice($this->baseqa->steps, 0, $lastseq + 1);
$this->observer = new question_usage_null_observer();
// This should be a straight copy of all the remaining fields.
$this->id = $this->baseqa->id;
$this->usageid = $this->baseqa->usageid;
$this->slot = $this->baseqa->slot;
$this->question = $this->baseqa->question;
$this->maxmark = $this->baseqa->maxmark;
$this->minfraction = $this->baseqa->minfraction;
$this->maxfraction = $this->baseqa->maxfraction;
$this->questionsummary = $this->baseqa->questionsummary;
$this->responsesummary = $this->baseqa->responsesummary;
$this->rightanswer = $this->baseqa->rightanswer;
$this->flagged = $this->baseqa->flagged;
// Except behaviour, where we need to create a new one.
$this->behaviour = question_engine::make_behaviour($this->baseqa->get_behaviour_name(), $this, $preferredbehaviour);
}