Form object helpers built on top of dry-validations

This gem for Ruby on Rails 4.0+ allows to create blocks for each field of the form. This allows to simplify syntax, show errors, add errors classes and validation attributes.

FragmentedValidation allows your model to only validate selected attributes.

Rails gem/plugin that implements an ActiveRecord validation helper called validates_as_date_time which validates U.S. dates, times, and date-times

Gem for simplify display of validation messages and flash.

Local Apple receipt validation.

Interdependent model validations

Simple recaptcha plugin which allows to add reCAPTCHA validations to your forms

Provides subset validation for serialized arrays or sets in Active Record

Object validation library

Generate attributes with strong types and validations.

Bailitheoir is a JavaScript that you can insert into your pages to ensure that the browser will implement form input validation.

Versions validations and comparisons!!!

Get validation error from database constraint.

Cave Forms encapsulate validation logic into an object with that single responsibility

Imports delimited text files to Active Record or Datamapper, with validations.

Clean Language Validation

Providing special validation error building for has_many collection in Rails.

Use the familiar ActiveModel::Errors pattern for controller validations

Detects issuer from a number, has ActiveModel validations and translations support.