Boolean class method companions for named_scopes

boolean_scope.rb

module ActiveRecord
  module NamedScope
    module ClassMethods
      alias_method :original_scope, :scope
      def scope(name, scope_options = {})
        original_scope(name, scope_options)
        boolean_scope = lambda do
          send(name).any?
        end
        singleton_class.send(:redefine_method, "#{name}?".to_sym, &boolean_scope) 
      end
    end
  end
end