Package of validations commonly used in Defra Rails based digital services

If you want to decouple validations from model it would be probably the easiest solution

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

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.

Json Schema Client is a Ruby client for JsonSchema with validation and hypermedia.

Create resources with run-time payload type checking and link validation

iTunes Receipt validation

Gem Utilities for ISBN validation and Isbn Conversion

Uidable is a module to add a uid(unique identifier) attribute in your model or class. With ActiveRecord, the presence and uniqueness validations are supported.

IBAN rails validator with iso-iban.

Provides validation and proper formatting for ISBN13 numbers.

Provides a DSL for common validation formats like Date, Array, DateTime etc.

Format and validation a URL in active record

MonkeyBars provides a structured DSL for safely monkey patching Ruby modules with built-in version checking, method validation, and constant management to prevent silent breakage when dependencies update.

Belief validation, evidence accumulation, and reality coherence for brain-modeled agentic AI

Adds a test that validates all your Rails fixtures.

A mountable Rails engine providing a complete data import workflow: upload/configure, preview with validation, and import. Supports CSV, JSON, XLSX, and API sources with a simple DSL for defining import targets.

Valid form submission based on the HTML5 validation on the form itself

DB of burner email domains. Use as one of the steps in your email validations.

Integrates with models.dev API to provide model validation, cost tracking, and change monitoring for 40+ LLM providers. Validate model names, calculate query costs, and track pricing changes.