This gem allows model to have state, and based on that create wizard with step by step validations

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.

FiletypeValidation is a Ruby gem for validating file content types.

Verify the existence of an email address.

100% exclusive message for any ActiveModel validation error.

LiveValidation integration with default Rails form helpers and validation methods.

ElasticSearch Queries, gem that allows elastic creation of complex ES queries, and end up in hashes. Validation enabled. Uses eapi gem)

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

Suggests validations and associations for ActiveRecord models

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.

Add state maps to Rails Enums for validation on transitions.

This gem will use ActiveRecord’s existing validates_format#presence#uniqueness_of method to check whether the email parameter has a valid format, is present and is unique

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

This gem is part of the Deployment and Orchestration for Puppet or DOP for short. dop_common is a library for the parsing and validation of DOP plan files.

The auto_seeder gem generates random, valid data for Rails models using Faker. It can seed data for multiple models, handle associations and respect validations.

Create Rails active record style validation in your non-Rails app

Provides a command line tool to perform different types of validations on MTR files. These files are YAML files that contain information about the performed test and the revision (commit) for which the test was performed.

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.

ActiveModel validations for domains with fully localization support.