Declares attribute for Active Model objects

Expand _changed? method. Enable to specify changed attribute value

Validates a specific attribute on ActiveModel, ActiveRecord

A base64 validator for Rails 3 and 4.

A behavior validator for Rails 3 and 4.

A Rails validator based on CanCan.

Provides coercions for ActiveModel objects

CSV Validator for Active Model

ActiveModel-style email address format validator

Simple email confirmation model implemented on top of ActiveModel::Model

An ActiveModel email validator based on the Mail gem.

Builds a tree of errors instead of the 1-dimension one generated by ActiveMode::Base#errors.messages.

Allows to get errors type from an activemodel class, as a symbol, prior to the translation

Common validations for ActiveModel

Serializing models to a single string makes it easy to pass references around.

A Rails validator for immutable attributes.

Interdependent model validations

ActiveModel validator for ip address.

A IPv4 and IPv6 validator for Rails 3 and 4.

Enqueue background jobs from model classes