Makes boolean validations a little cleaner.

Automatic field validation for forms backed by DataMapper models through Sinatra.

Validations for Ruby objects

Valentine is a simple validation library for JSON and ordinary Hash based on an easy Hash based syntax.

Rails gem/plugin that implements an ActiveRecord validation helper called validates_as_date_time which validates U.S. dates, times, and date-times

Validating-Workflow is a finite-state-machine-inspired API for modeling and interacting with what we tend to refer to as 'workflow'. * nice DSL to describe your states, events and transitions * robust integration with ActiveRecord and non relational data stores * various hooks fo...

contextual validations for controllers and wanna learn to do other stuff good too

DSL for variable scoping / encapsulation for readability and organisation, by means of block indents and explicit variable declarations. Useful when organising complex conditions such as procs (case-in-point: complex `... if: -> {}` Rails model validations

Add a validation headers filter to your rails controller.

Validate an email address using RFC 822 pattern match regex regular expressions

Basic document validation

Checksum validation for New Zealand IRD numbers. See http://www.ird.govt.nz/how-to/irdnumbers/ for details of what an IRD is.

Tiny implementation of the command pattern, including input validation, using Scrivener.

Simple actions and complex forms with validations, nesting, etc.

Simple YML validation

Library for validation of czech bank account numbers

A gem for id and passport validation.

Language Independent Validation Rules

A JSON schema validation tool.

add description to your classes and make your ActiveRecord validations smarter