Diesel Adapter

Use hydracache-diesel when Diesel remains the query authority and cached values should still use HydraCache keys, tags, TTL, and diagnostics.

Diesel is synchronous, so Diesel helpers run the supplied loader on tokio::task::spawn_blocking. The loader should own or acquire its connection inside the closure.

    let queries = DieselCache::new(HydraCache::local().build(), "diesel");

    let user_name = queries
        .entity::<String>("user", 42)
        .collection_tag("users")
        .diesel_one(move || {
            // Acquire or use a Diesel connection inside this blocking closure.
            Ok::<_, hydracache_diesel::diesel::result::Error>("Ada".to_owned())
        })
        .await?;

    assert_eq!(user_name, "Ada");

Use fetch_with when custom repository code, transactions, or an async Diesel wrapper needs more control.