CompositeValidator allows you to validate associated models and compose their validation errors to the parent model. It supports both single associations and collections.

Check on validations, background jobs, third-party integrations, state machines, and business rules

Perform basic validations for ISO 6346 intermodal containers

Generation, parsing, and validation of Instructure access tokens

Bulky allows you bulk update your ActiveRecord models. It will enqueue the bulk update and run it through the model's lifecycle to ensure validation are performed. Bulky also provides logging of bulk update success or failure.

Implements in-app purchase data parsing, signature validation,

Adds ActiveModel validation for domain format.

Gem to remove previously set validations

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

Client-side HTML form validations

A Ruby Gem for GTIN, UPC, EAN and ISBN barcode lookup and validation using the API on ean-search.org

CommandSet is a user interface framework. Its focus is a DSL for defining commands, much like Rake or RSpec. A default readline based terminal interpreter (complete with context sensitive tab completion, and the amenities of readline: history editing, etc) is included. It could very well be ad...

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

This library generates credit card numbers using the Luhn algorithm, suitable for testing payment systems and form validations.

Vies is a EU service that checks EU VAT business number validation and sends back its information.

Manage markup close to home... right in the model! Caching, validation, etc

A wrapper around Ruby's OptionParser with validation, conflict groups, and one-of constraints

This is a simple machine learning library written in Ruby. It provides implementations of linear regression and multiclass perceptron and visualization and validation methods to verify results. Also included are helper methods to work with training and testing data.

Integrates into Rails, allowing you to render JSON-RPC responses and validate incoming requests according to the JSON-RPC 2.0 specification. Includes middleware for strict request validation and a custom renderer. Designed for Rails 8+.

Automatically infer and create Ruby Struct-like classes from arbitrary data sources with runtime type validation