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How to generate associations between models...

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Casting ActiveModel attribute on return...

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How to pass argument to delegate method in Rails...

Rails 3: Checking if nested attributes have been changed?...

Should I use ActiveModel for this simple non-database Rails application?...

How to override ActiveRecord CRUD operations?...

Rails -- validations...

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How to append errors to a class using the 'ActiveModel::Errors' module...

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Setting properties on ActiveModel::Base from an initializer...

ActiveModel equivalent for ActiveRecord has_attribute?...

Trouble building an ActiveModel in Ruby on Rails 3 using namespaces...

where to put ActiveModel::Validator?...