Type-safe parameter validation and form objects for Rails.

Chronorails handles adding virtual attributes to your models (with suitable validations, etc) allowing you to set date and duration fields with natural language text.

Use ActiveRecord Validations in any class

Have trouble with advanced command line options, software dependency presence validation, handling inputs, confirmations and colorizing? Then this gem is for you. It provides you with some modules you can include to add those specific features.

SimpleForm Plugin for ClientSideValidaitons

This tool provides a one-command setup, configuration and validation for cloud servers.

Rails validation gem which ensures no contact information can be passed through a field. Contact information is twitter handles, email addresses, and phone numbers.

A ruby interface over the DataValidation service.

Includes optional reader/writer delegation and unobtrusive errors validation

Write self-documenting parameter validation and type-casting in your API actions. Docs and development at https://github.com/ozydingo/despecable.

Adds a Rails-esque validation method for use in Rails 3 with ActiveRecord or DataMapper

Digget makes creating search endpoints easier. It allows you to put some validations on incoming parameters and use these parameters to filter models.

Transform database constraint errors into activerecord validation errors

Hash validation for 'options'-like methods.

Property types that add CHECK constraints to your DB and validations to your model. Data integrity FTW.

Paper-thin Facebook validation and signed request parsing Rails plugin

Gem to remove previously set validations

Adds ActiveModel validation for domain format.

ActiveModel validations for domains with fully localization support.

This gem is part of the Deployment and Orchestration for Puppet or DOP for short. dop_common is a library for the parsing and validation of DOP plan files.