The document discusses the benefits of using Rust for database applications, particularly with respect to an ORM called Toasty. It includes code snippets demonstrating how to implement features such as querying users and handling asynchronous functions. The document also highlights the importance of reading generated code and addresses some runtime error handling techniques.

1. A ScyllaDB Community
Rust: A Productive Language for
Writing Database Applications
Carl Lerche
Principal Engineer at AWS

2. RUST IS (MOSTLY) USED AT THE
INFRASTRUCTURE LEVEL

3. RUST IS PRODUCTIVE

4. SAME BENEFITS APPLY
HIGHER UP THE STACK

5. ARE WE WEB YET?
HTTPS://AREWEWEBYET.ORG

6. TOASTY
A NEW ORM FOR RUST

7. EASE OF USE
OVER
MAXIMIZING PERFORMANCE

8. SQL
BUT ALSO NOSQL

9. PROCEDURAL MACROS

10. async fn hello_world() -> impl IntoResponse {
let hello_world = json!({
"hello": "world"
});
Json(hello_world)
}
let app = Router::new()
.route("/", get(hello_world));

11. #[derive(Serialize)]
struct HelloWorld {
hello: &'static str,
}
async fn hello_world() -> impl IntoResponse {
Json(HelloWorld {
hello: "world",
})
}

12. #[toasty::model]
struct User {
#[key]
#[auto]
id: Id,
#[unique]
email: String,
todos: [Todo],
}

13. SCHEMA FILE
AND
CODE GENERATION

14. let user = User::find_by_email(email)
.get(&db)
.await?;

15. async fn hello_world() -> impl IntoResponse {
let message = "world";
let hello_world = json!({
"hello": message
});
Json(hello_world)
}

16. HOW IMPORTANT IS READING
THE GENERATED CODE?

17. #[derive(Serialize)]
struct HelloWorld {
hello: &'static str,
}

18. AVOID SECOND-ORDER
TRAIT BOUNDS

19. fn set_name<T>(&mut self, name: T)
where
T: Into<String>,
{ ... }

20. fn serve<T, R>(T)
where
T: Service<Response = R>
R: Into<http::Response>,
{ ... }

21. pub fn find_by_email<'a>(
email: impl stmt::IntoExpr<'a, String>
) -> FindByEmail<'a> {
let expr = User::EMAIL.eq(email);
let query = Query::from_expr(expr);
FindByEmail { query }
}

22. RESULT FOR RUNTIME ERRORS
PANIC FOR BUGS

23. uri::Builder::new()
.authority("tokio.rs")
.build()
.unwrap();

24. let Ok(uri) = uri::Builder::new()
.authority(user_provided_authority)
.try_build()
else {
eprintln!("invalid authority");
abort();
};

25. let user = User::find_by_email(email)
.get(&db)
.await?;
for todo in user.todos() {
println!(
"Category: {}",
todo.category().name);
}

26. let user = User::find_by_email(email)
.include(toasty::path![User.todos.category])
.get(&db)
.await?;

27. WHAT IS NEXT?

28. THANK YOU
HTTPS://DISCORD.GG/TOKIO