Apply ActiveModel validations at a model instance level

NIS validation for ActiveModel

Some extra sensible validations

Provides an easy way to add model-based validations to excel files.

Auto generating ActiveModel validations for hashes

Provides Rails model services (such as validations) to non-ActiveRecord descendants.

adds a uniqueness validator for globalize3 translated models

Little gem that take advantage of Roo gem and Rails ActiveModel validation methods to read and validate the content of a spreadsheet

This gem wraps the guards.js jQuery validation library as a Rails asset gem.

Make it easy to use handles (callsigns/monikers/usernames) in URLs, even if they might be blank. Provides sensible validations and a find_by_id_or_handle method.

Adds video URL validation and API integration for using Vimeo on ActiveRecord models

IbanValidation provides a simple ActiveModel::EachValidator for formally validating International Bank Account Numbers (IBAN). It is based on the IBANTools gem.

This gem is used for the email validation and basic string operation like left padding, right padding, center padding, to uppercase, to lower case and to capitalize

This gem provides immutability validation. This is different from `readonly: true` stuff because it sets the error.

Use the ActiveRecord mimicking API to write into CM and enjoy all the benefits of callbacks, validations and permission checking

PIC is a pattern matching library, like regular expressions, based on Cobol edited pictures. It's advantage over regular expressions is it more concise syntax which geared specifically toward validation of user input.

This is useful when you want to define optional validations for a resource and keep it valid.

StripAttributes is a Rails plugin that automatically strips all ActiveRecord model attributes of leading and trailing whitespace before validation. If the attribute is blank, it strips the value to nil.

Simple easy contact form for Rails with I18n, validations, attachments and request information.

JsonValidation validates JSON according to a JSON Schema.