class ActionDispatch::Cookies::CookieJar

Returns the value of the cookie, or +nil+ if the cookie does not exist.

an options hash to delete cookies with extra data such as a :path.
and the expiration date in the past. Like []=, you can pass in
Removes the cookie on the client machine by setting the value to an empty string

def delete(name, options = {})
  return unless @cookies.has_key? name.to_s
  options.symbolize_keys!
  handle_options(options)
  value = @cookies.delete(name.to_s)
  @delete_cookies[name.to_s] = options
  value
end