Crate facet_validate 

Validation attributes for facet.

This crate provides validation attributes that can be used with the #[facet(...)] syntax. Validators are run during deserialization, providing errors with spans that point to the problematic JSON location.

Example

use facet::Facet;

#[derive(Facet)]
pub struct Product {
    #[facet(validate::min_length = 1, validate::max_length = 100)]
    pub title: String,

    #[facet(validate::min = 0)]
    pub price: i64,

    #[facet(validate::email)]
    pub contact_email: String,

    #[facet(validate::custom = validate_currency)]
    pub currency: String,
}

fn validate_currency(s: &str) -> Result<(), String> {
    match s {
        "USD" | "EUR" | "GBP" => Ok(()),
        _ => Err(format!("invalid currency code: {}", s)),
    }
}

Built-in Validators

Validator	Syntax	Applies To
min	validate::min = 0	numbers
max	validate::max = 100	numbers
min_length	validate::min_length = 1	String, Vec, slices
max_length	validate::max_length = 100	String, Vec, slices
email	validate::email	String
url	validate::url	String
regex	validate::regex = r"..."	String
contains	validate::contains = "foo"	String
custom	validate::custom = fn_name	any

Enums

Attr

Validation attributes for facet fields.

Functions

is_valid_email

Validates that a string is a valid email address.

is_valid_url

Validates that a string is a valid URL.

matches_pattern

Validates that a string matches a regex pattern.

Type Aliases

ValidatorFn

A function that validates a field value. Takes a type-erased pointer and returns Ok(()) if valid, or Err(message) with a description of the validation failure.