iron_valid 0.4.1

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

pub fn validate_required_if(values: &Map,
                            field: &str,
                            other: &str,
                            condition: &Value)
                            -> Result<Option<Value>, String> {
    match values.find(&[other]) {
        Some(value) if *value == *condition => {
            match values.find(&[field]) {
                Some(&Value::String(ref value)) if value.is_empty() => {
                    Err(format!("The {} field is required.",
                                field.to_lowercase().replace("_", " ")))
                }
                Some(&Value::Array(ref value)) if value.is_empty() => {
                    Err(format!("The {} field is required.",
                                field.to_lowercase().replace("_", " ")))
                }
                Some(&Value::Map(ref value)) if value.is_empty() => {
                    Err(format!("The {} field is required.",
                                field.to_lowercase().replace("_", " ")))
                }
                Some(&Value::Null) |
                None => {
                    Err(format!("The {} field is required.",
                                field.to_lowercase().replace("_", " ")))
                }
                _ => Ok(None),
            }
        }
        _ => Ok(None),
    }
}