format=(extension) public

Sets the \format by string extension, which can be used to force custom formats that are not controlled by the extension. 

  class ApplicationController < ActionController::Base
    before_filter :adjust_format_for_iphone

    private
      def adjust_format_for_iphone
        request.format = :iphone if request.env["HTTP_USER_AGENT"][/iPhone/]
      end
  end
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