iron_valid 0.5.0

Request validation library for iron, based on Laravel's validation
Documentation 
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use params::{Map, Value};

pub fn validate_in(values: &Map,
                   field: &[&str],
                   options: &[Value])
                   -> Result<Option<Value>, String> {
    match values.find(field) {
        Some(&Value::String(ref value)) if value.is_empty() => Ok(None),
        Some(&Value::Array(ref value)) if value.is_empty() => Ok(None),
        Some(&Value::Map(ref value)) if value.is_empty() => Ok(None),
        Some(value) => {
            if options.contains(value) {
                Ok(None)
            } else {
                Err(format!("The {} field must be among the options: {:?}.",
                            field.last()
                                .unwrap()
                                .to_lowercase()
                                .replace("_", " "),
                            options))
            }
        }
        None => Ok(None),
    }
}