Last example

prepend_example.rb

class AccountUser
  prepend Account
  def default_attributes
    {
      cpf: ''
    }
  end
end

class AccountStore
  prepend Account
  def default_attributes
    { 
      cnpj: ''
    }
  end
end

# Note que agora Account fica antes de AccountUser na cadeia de ascendência.
AccountUser.ancestors
=> [Account, AccountUser, Object, Kernel, BasicObject]

AccountStore.new.default_attributes
=> {:cnpj=>"", :name=>"", :state=>"", :city=>""}