test/models/person.rb


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require 'active_model/global_identification'

class Person
  include ActiveModel::GlobalIdentification
  
  attr_reader :id
  
  def self.find(id)
    new(id)
  end
  
  def initialize(id)
    @id = id
  end
  
  def ==(other_person)
    other_person.is_a?(Person) && id = other_person.id
  end
end