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.

Gem for validating complex JSON payloads in a functional way

Mail validation for ActiveModel

It's a simple tool that provides helper methods for credit card number validations using Luhn Algorithm.

Create K-fold splits from data files and assist in training and testing (useful for cross-validation in supervised machine learning)

Generates Rails models from the target database... magically! Validations and associations included.

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

A mail gem based validator for rails

A high-level IO library that provides validation, type conversion, and more for command-line interfaces. HighLine also includes a complete menu system that can crank out anything from simple list selection to complete shells with just minutes of work.

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.

Plinko helps you create validators that collect all validation errors instead of breaking on the first failure.

Validation of popular Polish codes, such as PESEL, NIP, REGON, post codes, car registration numbers, credit card numbers and anything really that can be helpful in advanced commercial application for Polish customers.

aids for creating and calculating error rates using target-decoy searches and sample validation.

Provides basic ORM functionalities like CRUD operations, transaction support, and custom validations.

This gem allows you to download a file. However, it will also check to see if a MD5 file exists at the source and compare against the destination for validation

SQLite constraints in migrations similiar to ActiveRecord validations

ActiveModel-compliant form objects for rails app. Forms have data and behavior. Let them be the objects they want to be. Plus, get presentation- specific validation logic out of your models.

Make ActiveRecord Validation easier to share as Schema