Rydantic derive

Procedural macros for Rydantic, a Rust library for data modeling, validation, JSON Schema and native Cap'n Proto.

Use the rydantic crate, which enables and re-exports #[derive(Model)] by default:

[dependencies]
rydantic = "0.5.0"

use rydantic::Model;

#[derive(Debug, Model)]
struct User {
    #[model(trim, min_length = 2)]
    name: String,
    #[model(ge = 18, le = 120)]
    age: u8,
}

let user = User::parse_json(r#"{"name":" Alice ","age":25}"#)?;
assert_eq!(user.name, "Alice");
# Ok::<(), rydantic::ValidationErrors>(())

See the API documentation and complete guide for borrowing, validators, model attributes, schemas and Cap'n Proto mappings.

With rydantic's capnp feature, #[rydantic::capnp_models] on an inline model module also infers the complete Cap'n Proto schema, invokes the installed official capnp compiler, and generates native Rust bindings automatically. Consumers maintain Rust model definitions without a separate schema, generated source file, or build script. The schema is available through CapnpSchema and the model module's CAPNP_SCHEMA constant.

License: MIT.

Enable sqlx, postgres or mysql for #[derive(Model, SqlModel)]: the macro generates portable table metadata, validated SQLx row decoding for enabled drivers, and asynchronous CRUD with transactions. The pool type selects SQLite, PostgreSQL or MySQL while model definitions stay the same. Combine it with the axum feature to use one model for HTTP JSON validation and database persistence. See the complete guide for #[sql(...)] attributes, queries, and the Tokio HTTP server example.

rydantic-derive 0.5.0

Rydantic derive