/**
* Save changes to question instance
*
* Saves changes to the question grades in the quiz_question_instances table.
* It does not update 'sumgrades' in the quiz table.
*
* @param int grade The maximal grade for the question
* @param int $questionid The id of the question
* @param int $quizid The id of the quiz to update / add the instances for.
*/
function quiz_update_question_instance($grade, $questionid, $quiz) {
global $DB;
$instance = $DB->get_record('quiz_question_instances', array('quiz' => $quiz->id,
'question' => $questionid));
$slot = quiz_get_slot_for_question($quiz, $questionid);
if (!$instance || !$slot) {
throw new coding_exception('Attempt to change the grade of a quesion not in the quiz.');
}
if (abs($grade - $instance->grade) < 1e-7) {
// Grade has not changed. Nothing to do.
return;
}
$instance->grade = $grade;
$DB->update_record('quiz_question_instances', $instance);
question_engine::set_max_mark_in_attempts(new qubaids_for_quiz($quiz->id),
$slot, $grade);
}
public function test_quiz_get_slot_for_question() {
$quiz = new stdClass();
$quiz->questions = '1,2,0,7,0';
$this->assertEquals(1, quiz_get_slot_for_question($quiz, 1));
$this->assertEquals(3, quiz_get_slot_for_question($quiz, 7));
}
