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_not_in_array(values: &Map,
                             field: &[&str],
                             other: &[&str])
                             -> Result<Option<Value>, String> {
    let options = match values.find(other) {
        Some(&Value::Array(ref value)) => value,
        _ => {
            return Err(format!("The {} field must not be one of the values in the {} field.",
                               field.last()
                                   .unwrap()
                                   .to_lowercase()
                                   .replace("_", " "),
                               other.last()
                                   .unwrap()
                                   .to_lowercase()
                                   .replace("_", " ")));
        }
    };

    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) {
                Err(format!("The {} field must not be one of the values in the {} field.",
                            field.last()
                                .unwrap()
                                .to_lowercase()
                                .replace("_", " "),
                            other.last()
                                .unwrap()
                                .to_lowercase()
                                .replace("_", " ")))
            } else {
                Ok(None)
            }
        }
        None => Ok(None),
    }
}