Module router 

Database routing: pick the database alias for reads and writes (Django DATABASE_ROUTERS).

Implement DatabaseRouter and attach it with Databases::with_router. Each hook may return an alias registered in the Databases; None defers to the default ("default"). A router naming an alias that is not registered yields OrmError::UnknownDatabase.

struct ReplicaRouter;

impl DatabaseRouter for ReplicaRouter {
    fn db_for_read(&self, _model: &ModelMeta) -> Option<&str> {
        Some("replica")
    }
}

Traits

DatabaseRouter

Chooses the database alias for a model. Every hook has a neutral default.