define_readers

# File activerecord/lib/active_record/associations/builder/singular_association.rb, line 16
      def define_readers
        super
        name = self.name

        model.redefine_method("#{name}_loaded?") do
          ActiveSupport::Deprecation.warn(
            "Calling obj.#{name}_loaded? is deprecated. Please use "              "obj.association(:#{name}).loaded? instead."
          )
          association(name).loaded?
        end
      end