formats=(extensions)
Instance Public methods
Sets the formats by string extensions. This differs from format= by allowing you
to set multiple, ordered formats, which is useful when you want to have a
fallback.
In this example, the :iphone format will be used if it's available,
otherwise it'll fallback to the :html format.
class ApplicationController < ActionController::Base
before_action :adjust_format_for_iphone_with_html_fallback
private
def adjust_format_for_iphone_w