class RuboCop::Cop::Rails::RootJoinChain

def on_send(node)
  evidence(node) do |rails_node, args|
    add_offense(node, message: format(MSG, root: rails_node.source)) do |corrector|
      range = range_between(rails_node.loc.selector.end_pos, node.source_range.end_pos)
      replacement = ".join(#{args.map(&:source).join(', ')})"
      corrector.replace(range, replacement)
    end
  end
end