class Ransack::Nodes::Grouping

def method_missing(method_id, *args)
  method_name = method_id.to_s
  writer = method_name.sub!(/\=$/, ''.freeze)
  if attribute_method?(method_name)
    if writer
      write_attribute(method_name, *args)
    else
      read_attribute(method_name)
    end
  else
    super
  end
end