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.

ReCaptcha implements view helpers to generate ReCaptcha code, with the noscript counterpart, required methods that interface with the HTTP API for captcha verification, a DSL to generate a before_filter and the code to implement AJAX captcha validation.

Manage markup close to home... right in the model! Caching, validation, etc

All of the goodness of ActiveModel (validations, callbacks, etc.) along with declarative typed accessors, JSON serialization, and more.

This is a gem which allows you to build ActiveRecord objects from an Excel file with validations in your rails application.

Find models in database which violate Active Record validation rules. Invalid models may raise unexpected error when updated.

Simple DSL to validate params (and coerce them to the desired type) that fall outside of Rails' default parameter whitelisting and ActiveModel validations system. The common use cases are searching and sorting, whether from an HTML form or via a JSON API.

A rails form helper and builder for use with Twitter's Bootstrap. It wraps form elements with the DOM necessary to render them correctly using Bootstrap and automatically renders validation errors using Bootstrap.

Core classes for data validation with contracts approach (using Either + Writer monad combination & ADT for composition)

RSpec matches for Nobrainer models, including association and validation matchers.

As your Rails projects evolve and grow, your model validations tend to change as well. An unfortunate side effect of this evolution is that your table- backed ActiveRecord::Base descendants end up with rows that instantiate invalid model instances. ValidData generates a report for your Rails appl...

This gem allows you to pass in a EDIFACT string or file, and returns an array structure, to enable additional processing and validation

Extend your Rails forms with character countdown fields easy with just setting validations to your models.

Adds a new validation for ActiveRecord, 'has_unpublished_password'

Need a simple, consistent way to create model instances and check validations in your ActiveRecord 3.1+ tests? Use the Modelizer. Just don't trust the docs, since lots changed in 5.x and I got lazy.