iron_valid 0.4.1

Request validation library for iron, based on Laravel's validation
Documentation 
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use std::f64;

use params::{Map, Value};

pub fn validate_different(values: &Map, field: &str, other: &str) -> Result<Option<Value>, String> {
    match values.find(&[field]) {
        Some(&Value::String(ref value)) => {
            if value.is_empty() {
                return Ok(None);
            }
            match values.find(&[&[other].concat()]) {
                Some(&Value::String(ref value2)) if value != value2 => Ok(None),
                _ => {
                    Err(format!("The {} field must be different than the {} field.",
                                field.to_lowercase().replace("_", " "),
                                other.to_lowercase().replace("_", " ")))
                }
            }
        }
        Some(&Value::U64(ref value)) => {
            match values.find(&[&[other].concat()]) {
                Some(&Value::U64(ref value2)) if value != value2 => Ok(None),
                _ => {
                    Err(format!("The {} field must be different than the {} field.",
                                field.to_lowercase().replace("_", " "),
                                other.to_lowercase().replace("_", " ")))
                }
            }
        }
        Some(&Value::I64(ref value)) => {
            match values.find(&[&[other].concat()]) {
                Some(&Value::I64(ref value2)) if value != value2 => Ok(None),
                _ => {
                    Err(format!("The {} field must be different than the {} field.",
                                field.to_lowercase().replace("_", " "),
                                other.to_lowercase().replace("_", " ")))
                }
            }
        }
        Some(&Value::F64(ref value)) => {
            match values.find(&[&[other].concat()]) {
                Some(&Value::F64(ref value2)) if (value - value2).abs() >= f64::EPSILON => Ok(None),
                _ => {
                    Err(format!("The {} field must be different than the {} field.",
                                field.to_lowercase().replace("_", " "),
                                other.to_lowercase().replace("_", " ")))
                }
            }
        }
        Some(&Value::Boolean(ref value)) => {
            match values.find(&[&[other].concat()]) {
                Some(&Value::Boolean(ref value2)) if value != value2 => Ok(None),
                _ => {
                    Err(format!("The {} field must be different than the {} field.",
                                field.to_lowercase().replace("_", " "),
                                other.to_lowercase().replace("_", " ")))
                }
            }
        }
        Some(&Value::Array(ref value)) => {
            if value.is_empty() {
                return Ok(None);
            }
            match values.find(&[&[other].concat()]) {
                Some(&Value::Array(ref value2)) if value != value2 => Ok(None),
                _ => {
                    Err(format!("The {} field must be different than the {} field.",
                                field.to_lowercase().replace("_", " "),
                                other.to_lowercase().replace("_", " ")))
                }
            }
        }
        Some(&Value::Map(ref value)) => {
            if value.is_empty() {
                return Ok(None);
            }
            match values.find(&[&[other].concat()]) {
                Some(&Value::Map(ref value2)) if value != value2 => Ok(None),
                _ => {
                    Err(format!("The {} field must be different than the {} field.",
                                field.to_lowercase().replace("_", " "),
                                other.to_lowercase().replace("_", " ")))
                }
            }
        }
        None => {
            // Allow empty values
            Ok(None)
        }
        _ => {
            Err(format!("The {} field must be different than the {} field.",
                        field.to_lowercase().replace("_", " "),
                        other.to_lowercase().replace("_", " ")))
        }
    }
}