method

formats=

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formats=(extensions) public

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_with_html_fallback
      request.formats = [ :iphone, :html ] if request.env["HTTP_USER_AGENT"][/iPhone/]
    end
end

Show source

# File actionpack/lib/action_dispatch/http/mime_negotiation.rb, line 134
      def formats=(extensions)
        parameters[:format] = extensions.first.to_s
        set_header "action_dispatch.request.formats", extensions.collect { |extension|
          Mime::Type.lookup_by_extension(extension)
        }
      end

formats=

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