A macro-style method that will automatically read the database contraints (null requirements, string length, etc) and enforce those at the model level to keep validation more DRY. Provides many options to customize how automatic it is and what columns it affects.

Telephone number validation based on RFC3966

Call method_contraints! with the param name and constraint to enforce validation on it

A Rails controller concern which makes it easy to encapsulate validation and processing of complex incoming data into command classes.

Small and extensible data validation toolkit

Hashie2 + ActiveModel 3, offering declared properties, validations, JSON serialization/deserialization

Provides a OneOfManyValidator for Rails validation. This allows you to validate that one of a set of fields should be required, but no particular field itself is required.

ActiveModel validation that two associated models are related to each other.

JSON-LD documents validation

Rails gem that implements an ActiveRecord validation helper called validates_as_postal_code which validates U.S. postal codes

Rails gem that implements an ActiveRecord validation helper called validates_as_phone_number which validates U.S. phone numbers

Validations for Non Active Record Models

Guardrail captures validation errors from your Ruby on Rails application to help you identify and fix user experience issues. The GuardrailNotifier gem makes it easy to hook up your app to the Guardrail web service.

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.

Verify the existence of an email address.

ActiveRecord dirty tracking that compares every attribute to it's value before type cast and marks all changes detected as changed attributes. This makes it possible to detect `user.name.upcase!` `user.roles << 'some_role'` and similar implicit changes. To make it automatic on ...

Package of validations commonly used in Defra Rails based digital services

Process parameters base on OpenApi3 JSON documentation, such as: validation and type conversion

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

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.