ActiveModel::Permalink generates permalinks for your ActiveModel objects, including support for Mongoid.

Adds in-memory persistence to ActiveModel models

Adds methods for automatic deserialization from standard JSON and XML, and a variant implementation of serialization/deserialization for XML.

active_model_serializers_binary is a declarative way to serialize/deserialize ActiveModel classes for raw data exchange.

Standardize service calls

Simple session model implemented on top of ActiveModel::Model

Use lazy translations from models

Typecast your active record attributes to symbols.

ActiveModel validators that validate the type of attributes, and that do recursive validation of contained objects parallel to ActiveRecord's validates_associated.

Only add a error messages for one model attribute if this error message not exists for the model attribute

ActiveModel::Unvalidate provides a clean api for removing existing validations from models

A url validator for Rails 3 and 4.

Additional validations for Active Model

Validate that your Active Record models comply with legal policies, verified by AI.

An ActiveModel extension for more expressive validations reflection

Virtuozzo ActiveModel validators.

Some reusable ActiveModel validations, including greater_than, boolean_presence, and at_least_one_present

Add more validators for your ActiveModel models.

Active Model Serializer with versioning

Mark some validations as warnings and let them be easily skipped