Toasty

Current status: Incubating - Toasty is not ready for production usage. The API is still evolving and documentation is lacking.

Toasty is an ORM for the Rust programming language that prioritizes ease-of-use. It supports both SQL databases as well as some NoSQL databases, including DynamoDB and Cassandra. Note that Toasty does not hide the database capabilities. Instead, Toasty exposes features based on the target database.

Using Toasty

Projects that use toasty create a schema file to define the application's data model. Here is the schema file from the hello-toasty example:

model User {
    #[key]
    #[auto]
    id: Id,

    name: String,

    #[unique]
    email: String,

    todos: [Todo],

    moto: Option<String>,
}

model Todo {
    #[key]
    #[auto]
    id: Id,

    #[index]
    user_id: Id<User>,

    #[relation(key = user_id, references = id)]
    user: User,

    title: String,
}

Using the Toasty CLI tool, you will generate all necessary Rust code for working with this data model. The generated code for the above schema is here.

Then, you can easily work with the data model:

// Create a new user and give them some todos.
let user = User::create()
    .name("John Doe")
    .email("john@example.com")
    .todo(Todo::create().title("Make pizza"))
    .todo(Todo::create().title("Finish Toasty"))
    .todo(Todo::create().title("Sleep"))
    .exec(&db)
    .await?;

// Load the user from the database
let user = User::find_by_id(&user.id).get(&db).await?

// Load and iterate the user's todos
let mut todos = user.todos().all(&db).await.unwrap();

while let Some(todo) = todos.next().await {
    let todo = todo.unwrap();
    println!("{:#?}", todo);
}

SQL and NoSQL

Toasty supports both SQL and NoSQL databases, including Cassandra and DynamoDB. However, it does not aim to abstract the database. Instead, Toasty leans into the target database's capabilities and aims to help the user avoid issuing innefficient queries for that database.

When targetting both SQL and NoSQL databases, Toasty generates query methods (e.g. find_by_id only for access patterns that are indexed). When targetting a SQL database, Toasty might allow arbitrary additional query constraints. When targetting a NoSQL database, Toasty will only allow constraints that the specific target database can execute. For example, with DynamoDB, query methods might be generated based on the table's primary key, and additional constraints may be set for the sort key.

Application data model vs. database schema

Toasty decouples the application datamodel from the database's schema. By default, a toasty application schema will map 1-1 with a database schema. However, additional annotations may be specified to customize how the application data model maps to the database schema.

For example, the crate-hub examples shows how to map multiple application models to a single database table.

table user_and_packages {
    model User {
        #[key]
        #[auto]
        id: Id,

        name: String,

        #[unique]
        email: String,

        packages: [Package],
    }

    #[key(partition = user_id, local = id)]
    model Package {
        #[relation(key = user_id, references = id)]
        user: User,

        user_id: Id<User>,

        #[auto]
        id: Id,

        name: String,
    }
}

Current status and roadmap

Toasty is still in the early development stages and is considered incubating. There is no commitment to on-going maintenance or development. At some point in the future, as the project evolves, this may change. As such, we encourage you to explore, experiment, and contribute to Toasty, but do not try using it in production.

Immediate next steps for the project are to fill obvious gaps, such as implement error handling, remove panics throughout the code base, support additional data types, and write documentation. After that, development will be based on feedback and contribution.

License

This project is licensed under the MIT license.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in Tokio by you, shall be licensed as MIT, without any additional terms or conditions.

License

claymcleod/toasty

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