Example of mongoose transaction. MongoDB transaction example

Example.js

exports.deleteUser = async (req, res, next) {
    const session = await mongoose.startSession();
    try {
        const { id } = req.params;
        // Start session
        await session.startTransaction();
        // deleteMany in this session
        const [errorOp, result] = await toAll([App.deleteMany({ user: id }).session(session), UserModel.findByIdAndRemove(id).session(session)]);
        if (errorOp) {
            throw new ErrorRequest(STATUS_CODE.UNPROCESSABLE, errorOp.message);
        }
        const [app, user] = result;
        // if does not found user throw an error
        if (!user) {
            throw new ErrorRequest(STATUS_CODE.BAD_REQUEST, 'User not found.');
        }
        // delete user if delete apps succeed
        const { password, ...deletedUser } = user;
        // finish transcation
        await session.commitTransaction();
        session.endSession();
        return res.send({ status: 'User deleted', ...deletedUser, appDeletedCount: app.deletedCount });
    } catch (err) {
        await session.abortTransaction();
        session.endSession();
        next(err);
    }
}