Support for the Ruby 2.4 series has ended. See here for reference.
# File rss/maker/slash.rb, line 8 def self.append_features(klass) super ::RSS::SlashModel::ELEMENT_INFOS.each do |name, type| full_name = "#{RSS::SLASH_PREFIX}_#{name}" case type when :csv_integer klass.def_csv_element(full_name, :integer) else klass.def_other_element(full_name) end end klass.module_eval do alias_method(:slash_hit_parades, :slash_hit_parade) alias_method(:slash_hit_parades=, :slash_hit_parade=) end end