ActiveModelChangeset provides a lightweight changeset abstraction for Ruby on Rails applications. It combines type casting, attribute normalization, validation and diff calculation into a single object, enabling safe and explicit create/update operations with patch semantics. The gem is designed for service objects and APIs, allowing developers to whitelist attributes, apply transformations, validate input and update models using only changed values, without relying on ActiveRecord callbacks or controllers.

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

This gem has been renamed active_model_jobs.

A simple json validator based on ActiveModel.

Provides the ActiveModel::Lint::Tests for test-unit or minitest an RSpec shared example.

Provides a Logger::LogDevice that can save Ruby Logger messages to an array in your model

Simple password model implemented on top of ActiveModel::Model