class Account
  include DataMapper::Resource
 
  property :id,   Serial
  property :name, String, :nullable => false
 
  repository(:legacy) do
    property :active, Boolean, :nullable => false, :default => true
 
    has n, :billing_terms
  end
end
 
account = Account.get(1)
account.repository.name  # => :default
account.active           # => raises NoMethodError (in the future)
account.billing_terms    # => raises NoMethodError (in the future)
 
repository(:legacy) do
  account = Account.get(1)
  account.repository.name  # => :legacy
  account.active           # => true
  account.billing_terms    # => Collection of BillingTerm objects from legacy repo
end