ActiveRecord::Aggregations::ClassMethodsRuby on Rails 8.0.2 Module ActiveRecord::Aggregations::ClassMethods activerecord/lib/active_record/aggregations.rb Active Record Aggregations Active Record implements aggregation through a macro-like class method called composed_of for representing attributes as value objects. It expresses relationships like “Account [is] composed of Money [among other things]” or “Person [is] composed of [an] add
