An ActiveModel extension that automatically converts all non-English digits to English digits before validation. https://github.com/aalyahya/normalize_digits

expose presence-validation in a more controller-friendly manner

Adds a handful of simple, one-liner association and validation assertions to ActiveSupport::TestCase.

A schema parsing and validation library for Ruby

Helpful rspec matchers for testing validations and associations.

Extra validations for Scrivener.

Integrates sequel validations and sequel hooks into couchbase model.

BicValidation provides a simple ActiveModel::EachValidator for formally validating Business Identifier Codes (BIC) aka SWIFT-codes.

PORO validation mixin with no deps

simple validation

Param checker adds a before filter for each api to do the validation

Easy validation and processing of Paypal IPN payments

Adds new validations to AR

It is a Gem for creating and rendering the HTML of the error message when there is a validation error for the request sent by ajax.

WADL validator for requests

YAML files loader with validation

Simple validation library with virtus integration

Brazilian zipcode validations for ActiveRecord, integrated with correios-cep gem.

ActiveRecord model validation against stopforumspam.com (Rails 3)

IAP and IAB receipt validation module.