def private_const_set(name, const)
      unless role_const_defined?(name)
        const = const_set(name, const)
        private_constant name.to_sym
      end
      const
    end
def private_const_set(name, const)
      unless role_const_defined?(name)
        const = const_set(name, const)
        private_constant name.to_sym
      end
      const
    end
Set a named constant and make it private