/**
* Update a student document's 'answers' field with new saved answers.
*/
private static function saveStudentAnswers(Application $application)
{
$studentId = $application->getStudentId();
$questions = $application->getQuestions();
if (count($questions) == 0) {
return;
}
// Retrieves the question-answer pairs.
$answers = StudentModel::getAnswers($studentId);
// Loop through $questions, replace answer for the corresponding question
// in $answers, or append to $answers if it is not in $answers.
$answersHash = arrayToHashByKey($answers, '_id', 'index');
foreach ($questions as $question) {
$questionId = $question['_id'];
$newAnswer = $question['answer'];
if (isset($answersHash[$questionId . ''])) {
$index = $answersHash[$questionId . ''];
$answers[$index]['answer'] = $newAnswer;
} else {
$answers[] = ['_id' => $questionId, 'answer' => $newAnswer];
}
}
StudentModel::replaceAnswers($studentId, $answers);
}
