int SqliteJoinedProjectRepository::getStudentsInProject(ProjectPtr project, std::vector<int> &ids)
{
    QSqlQuery qry(_db);

    QString qlist = "SELECT user_id FROM project_student_registered WHERE project_id = :pid";

    qry.prepare(qlist);
    qry.bindValue(":pid", project->getId());

    if(!qry.exec()) {
        qDebug() << qry.lastError();
        return 1;
    } else {
        while(qry.next()) {
            ids.push_back(qry.value(0).toInt());
        }
    }
    return 0;
}