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_distinct(values: &Map, field: &[&str]) -> Result<Option<Value>, String> {
    match values.find(field) {
        Some(&Value::Array(ref value)) => {
            let mut checked: Vec<Value> = Vec::with_capacity(value.len());
            for item in value {
                if checked.contains(item) {
                    return Err(format!("The {} field must not contain any duplicate values.",
                                       field.last()
                                           .unwrap()
                                           .to_lowercase()
                                           .replace("_", " ")));
                }
                checked.push(item.clone());
            }
            Ok(None)
        }
        _ => Ok(None),
    }
}