[Enh] Please addition session for mongoose 5.2.x

[zinzinday]

mongoose.startSession().then(async (session) => {
        session.startTransaction();
        try {
            let opts = {session, validateBeforeSave: true};
            let user = await new User(req.body).save(opts);
            let wallet = await new Wallet({user: user.id}).save(opts);
            await session.commitTransaction();
            res.send({success: true, data: user});
        } catch (e) {
            await session.abortTransaction();
            return next(e);
        }
})

Current debug output miss session.id to command query find exist validate

Mongoose: users.find({ _id: { '$in': [ 'bdd7a1f9-b57b-45e3-ab85-9b9a7a956ec1' ] } }, { fields: { _id: 1 } })
wallet validation failed: user: user with id bdd7a1f9-b57b-45e3-ab85-9b9a7a956ec1 does not exists