Validations for Ohm models

Validation errors for logging

Serializes ActiveRecord validations into JSON for use by rich-client apps.

emailvalidation.io provides an email validation & verification API. Automate email validation & verification without any user interaction.

Simple model and validation mixins for RubyMotion

A gem/plugin for Rails 3+ that enables client-side validation using ActiveModel + HTML5

Robust options validation for methods.

A Ruby wrapper for the World Wide Web Consortium’s online validation services.

Rails plugin that maps model validations to class names on form elements to integrate with Validatious.

Phone number parsing, validation and formatting

Includes a couple of core functions such as callbacks, timestamping, typecasting and lots of generic validation routines.

ActiveRecord Tableless Models provides a simple mixin for creating models that are not bound to the database. This approach is useful for taking advantage of the features of ActiveRecord such as validation, relationships, etc.

Regressor generates regression specs based on ActiveRecord models. Currently relations, validations, attributes, and database indexes are supported.

Automatically includes Modules from app/concerns/<module_with_concerns>/<concern>.rb into <module_with_concerns> to ease monkey-patching associations and validations on ActiveRecord::Base descendents from other gems when layering schemas.

Introspects your database string field maximum lengths and automatically defines length validations.

Machinery is a systems management toolkit for Linux. It supports configuration discovery, system validation, and service migration. It's based on the idea of a universal system description.

cucumber-api allows API JSON response validation and verification in BDD style.

Minimalist validation matcher

Add a validation filter to your controller.

ActiveRecord extension. Allows to save record without calling callbacks and validations.