class RuboCop::Cop::Rails::FilePath

def on_dstr(node)
  return unless rails_root_nodes?(node)
  return unless node.children.last.str_type?
  last_child_source = node.children.last.source
  return unless last_child_source.start_with?('.') ||
                last_child_source.include?(File::SEPARATOR)
  return if last_child_source.start_with?(':')
  register_offense(node)
end