[Rails] Form cancel url

form_cancel_url.rb

def form_cancel_url(*models)
  Rails.root unless models.empty?

  last_idx = models.length - 1
  names = []
  models.each_index do |idx|
    model = models[idx]
    if model
      name = model.class.name.tableize
      name = name.singularize unless model.new_record?
      names << name
    end
  end
  name = names.join '_'
  send "#{name}_url"
end