Example of a DataMapper Repository

datamapper_user_repository.rb

module DataMapperRepository
  class UserRepository
    def model_class
      DataMapperRepository::User
    end
 
    def new(attributes = {})
      model_class.new(attributes)
    end
 
    def save(object)
      object.save
      return object
    end
 
    def find_by_id(n)
      model_class.get
    end
  end
end