Update the datasource/database read preference at the run time.

Describe the bug

For architectural reasons, I need to update the readPreference for a given method, on a given repository at the fly.
Please note, this change should be done at real time, and impact only this function invocation. However, the readPreferrence at the application level/datasource level should remain intact to "primaryPreferred".

For example,

this.userRepo.find(filter, { readPreference: "secondary" }); // request is still going to primary MongoDB server!
this.userRepo.findById(filter, { readPreference: "primary" });

I've tried this, but upon checking mongodb logs, this does not seem to work. All the request are going to primary server.

MongoDB version: v4.2

Logs

NA

Additional information

NA

Reproduction

https://github.com/shivambmgupta/loopback-next/tree/bug/read-preference-update

Commencez par la branche de reproduction liée et suivez les appels du repository en utilisant find et findById avec des options readPreference par invocation sur MongoDB 4.2. Vérifiez qu’une préférence au niveau de la méthode ne modifie que cette invocation, tandis que le paramètre de l’application et de la datasource reste primaryPreferred ; confirmez la sélection de serveur qui en résulte dans les logs de MongoDB.