Europe is a simple library for retrieving EU government data such as VAT information, VAT validation, currency exchange rates and country information.

Common Rails validations wrapped in a gem.

This gem allows you to create use cases with ActiveModel validations and keep your model clean

Easy client side validation for your ActiveRecord models

Allows defining structure of data and perform validation against it using json-schema

Postgresql constraints in migrations similiar to ActiveRecord validations

A Rails plugin that allows validation on partially completed Active Record models (useful in wizards that incrementally build a model).

GTIN provides basic validation, checksum and conversion functionality for UPC, EAN and GTIN barcode values.

Scrivener removes the validation responsibility from models and acts as a filter for whitelisted attributes. Works with Opal.

Provides wrapper functionality and authentication for REST and RPC HTTP requests to OpenSocial-compliant endpoints, along with validation of incoming signed makeRequest calls.

Ruby on Rails plugin for HTML validation and link checking

A small library for manipulating form-based data with validations and attributes coercion.

A wrapper around Ruby's OptionParser with validation, conflict groups, and one-of constraints

Thread-safe immutable objects that provide delegation and basic validation to hashes.

Read model file to extract the validations/associations and then utilize Rails generator to write correspondent shoulda test cases to your correspondent spec file

DrySQL uses your DB's information schema to identify keys, and generate associations and validations for ActiveRecord objects. You defined the schema on your DB ... don't re-define it in your application code. Legacy DB Tables, Ruby Desktop apps, Rails apps...DrySQL's got all your databases covered

Display error messages in qtips(tooltip) for all rails erros and jquery validation errors

A library used to create Config classes with validation, type enforcement, casting and other goodies.

Sane parameter validation for Rack::Request. Originally written for use with Sansom.

An admin sets up the raffle entry requirements. Users must meet the raffle validation requirements setup by the admin before entering into the game. Participants can enter into raffle and win points.