How do define read replicas in gorm postgresql - postgresql

Question

I am using golang in my application server and gorm as the ORM. I am using postgresql as the database in google cloud sql.
I created a 2 read replica's for postgres which are being used by the application server.
Previously, I used node.js and sequelize and there, I am able to define the read replicas as
read: [
{ host: '8.8.8.8', username: 'anotherusernamethanroot', password: 'lolcats!' },
{ host: 'localhost', username: 'root', password: null }
],
write: { host: 'localhost', username: 'root', password: null }
},
However for gorm, I dont see any way to do that(in the documentation).
So, is there a way that I can define read replicas and gorm takes care of it. If not, what is the best practice for this use case?

Answer 1

Now that Gorm V2 is out you can use the dbresolver plugin just for this use case. Replicating what you gave as an example would look like:
import (
"gorm.io/gorm"
"gorm.io/plugin/dbresolver"
"gorm.io/driver/postgres"
)
db, err := gorm.Open(postgres.Open("host=localhost user=root"), &gorm.Config{})
db.Use(dbresolver.Register(dbresolver.Config{
Replicas: []gorm.Dialector{
postgres.Open("host=8.8.8.8 user=anotherusernamethanroot password=lolcats!"),
postgres.Open("host=localhost user=root"),
},
Policy: dbresolver.RandomPolicy{},
})
Check out the documentation: https://gorm.io/docs/dbresolver.html