JsonColumn is a simple HashWithIndifferentAccess with a ._schema method. It makes it easier to deal with json, jsonb postgresql column. It provide validation with josn-schema

A collection of various validators for Rails forms

Allow for validation of only some attributes

ActiveModel validation for credit card number.

Validations for european countries VAT numbers

A Ruby Gem For Chinese Mainland Personal ID Card Validation

Normalize dry-validation and ActiveModel errors to the universal format

Logobox translates ICO of the company into appropriate logo url at logobox.cz\nIt can check that the logo is uploaded and make the ICO validation.

An ActiveModel validator that consolidates multiple password validations.

Rails 3 assocation validation for id fields

Three level validation on email addresses for ActiveRecord.

Validations is a library for validating data structures.

This gem helps you to create real validation for email, not just a simple regex

This RubyGem allows you to prevent particular database fields from being changed after an Active Record object is created. A validation error occurs on updates if an attribute of a model object is different from its value in the database.

Merb plugin that provides a Form Builder that will wrap your bound fields with a field div, integrated with the model validation

Hash validation for 'options'-like methods.

This Gem is Used for Validations URLs

Just a simple, ready to use interactor implementation with built in validation of input params

Tiny plugin for MongoMapper to sanitize strings before validation.

Modify model fields before validation