gistfile1.txt

<?php
class DiscussionRepository
{
    public function __construct(DiscussionMapper $mapper) {...}

    public function fetchDiscussion($id)
    {
        $record = $this->mapper->select(['discussion_id' => $id])
            ->with(['author']);
        return $this->newDiscussion($record);
    }
    
    protected function newDiscussion($record)
    {
        $discussionId = DiscussionId::createFrom($record->discussion_id);
        $author = Author::createFrom($record->author);
        return Discussion::createFrom($discussionId, $author);
    }
}