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.

ActiveRecord Tableless provides a simple mixin for creating models that are not bound to the database. This approach is mostly useful for capitalizing on the features ActiveRecord::Validation

Simple YML validation

Library for validation of czech bank account numbers

A gem for id and passport validation.

Language Independent Validation Rules

Find unsafe ActiveRecord validations and the invalid data left behind

A JSON schema validation tool.

Params validations for Ruby on Rails

Custom ActiveModel::Validations to Make Your Life Easier

Compares the differences between a structure.sql file and a database and reports the inconsistencies.

RSpec matches for Mongoid models, including association and validation matchers

A gem that generates Ruby classes for JSON schema validation of API endpoints based on their Swagger documentation.

Hval 🐳 is hash validation gem

html_pretty is yet another HTML prettifier. It purposefully does not do parsing or validation.

Allow to store ActiveModel validations in ORM.

Validations, except they don't do anything.

Format and validation a URL in active record

The lightest of ORMs excluding magic such as properties, primary keys, associations, validations.