rydantic 0.8.0

Type-driven validation, JSON Schema, Cap'n Proto, Axum and SQLx models for Rust
Documentation 
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//! The complete first-model tutorial. Run with `cargo run -p rydantic --example data_contract`.
use rydantic::{Model, SchemaMode};

#[derive(Debug, Model)]
#[model(extra = "forbid")]
struct Signup {
    #[model(trim, min_length = 2)]
    name: String,
    #[model(trim, lowercase, email)]
    email: String,
    #[model(coerce, ge = 18, le = 120)]
    age: u8,
    #[model(default)]
    tags: Vec<String>,
    note: Option<String>,
}

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let signup = Signup::parse_json(r#"{"name":" Ada ","email":" ADA@EXAMPLE.COM ","age":"36"}"#)?;
    assert_eq!(signup.name, "Ada");
    assert_eq!(signup.email, "ada@example.com");
    assert_eq!(signup.age, 36);
    assert!(signup.tags.is_empty());
    assert!(signup.note.is_none());
    println!("Accepted: {}", signup.dump_json()?);

    let errors = Signup::parse_json(r#"{"name":"A","email":"invalid","age":17,"unexpected":true}"#)
        .expect_err("all four invalid fields must be reported");
    assert_eq!(errors.len(), 4);
    for error in errors.errors() {
        println!("Rejected {}: {}", error.pointer(), error.code);
    }

    let schema = Signup::json_schema(SchemaMode::Input);
    println!("Input schema generated: {}", schema["$schema"]);
    Ok(())
}