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class Developer < ActiveRecord::Base
has_and_belongs_to_many :projects
validates_inclusion_of :salary, :in => 50000..200000
validates_length_of :name, :within => 3..20
end
DeveloperSalary = Struct.new(:amount)
class DeveloperWithAggregate < ActiveRecord::Base
self.table_name = 'developers'
composed_of :salary, :class_name => 'DeveloperSalary', :mapping => [%w(salary amount)]
end
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