/**
* Up votes the given answer, if permitted for the given $userId
* @param string $userId
* @param string $projectId
* @param string $questionId
* @param string $answerId
* @return array
*/
public static function voteUp($userId, $projectId, $questionId, $answerId)
{
$projectModel = new ProjectModel($projectId);
ProjectCommands::checkIfArchivedAndThrow($projectModel);
$questionModel = new QuestionModel($projectModel, $questionId);
// Check the vote lock.
$vote = new UserVoteModel($userId, $projectId, $questionId);
if ($vote->hasVote($answerId)) {
// Don't throw. There's no harm in this, just don't increment the vote.
return self::encodeAnswer($questionModel->readAnswer($answerId));
}
// If ok up vote the question and add the lock.
$answerModel = $questionModel->readAnswer($answerId);
$answerModel->score++;
$questionModel->writeAnswer($answerModel);
$vote->addVote($answerId);
$vote->write();
ActivityCommands::updateScore($projectModel, $questionId, $answerId, $userId);
// Return the answer dto.
return self::encodeAnswer($answerModel);
}
