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.

Angulate adds AngularJS client-side field and validation helpers to Rails form helpers.

Handle multiple flash messages and ActiveRecord validation errors with ease.

CommandSet is a user interface framework. Its focus is a DSL for defining commands, much like Rake or RSpec. A default readline based terminal interpreter (complete with context sensitive tab completion, and the amenities of readline: history editing, etc) is included. It could very well be ad...

Partial validation of ActiveRecord objects in Ruby on Rails 4+ made simple.

Shorter Active Record validations and associations with RSpec and shoulda support

This library generates credit card numbers using the Luhn algorithm, suitable for testing payment systems and form validations.

Vies is a EU service that checks EU VAT business number validation and sends back its information.

Bailitheoir is a JavaScript that you can insert into your pages to ensure that the browser will implement form input validation.

A gem for Ruby Rails client side validations.

Rubinium is a FIT-style code generator for Selenium. It supports validation and allows the user to include arbitrary ruby in the test.

Includes email and presence validations.

Adds model validations to the host application

This simple_restricted_attributes plugin/gem provides the capabilities to restrict attributes(fields) of db table's while add or update a record. It validate your attributes values before your validation stuff.

A simple set of types for validation of ruby objects.

Adds CPF, CNPJ and Email validation

Similar to strong_parameters, but adds type validation and makes it possible to retrieve the invalid or unpermitted parameters

Gem for turning off validations and callbacks in test environment