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Deprecating composed_of in ActiveRecord
This feature adds a lot of complication to ActiveRecord for dubious value. Let's talk about what it does currently: class Customer < ActiveRecord::Base composed_of :balance, :class_name => "Money", :mapping => %w(balance amount) end Instead, you can do something like this: def balance @balance ||= Money.new(value, currency) end def balance=(balance) self[:value] = balance.value self[:currency] = balance.currency @balance = balance end Since that's fairly easy code to write, and doesn't need anything extra from the framework, if you use composed_of today, you'll have to add accessors/mutators like that. This feature will be removed in Rails 4.
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