What provides boolean query methods on Mime::Type instances for the native Rails mime-types.

You now have these methods
available from your controllers:

request.format.atom?
request.format.css?
request.format.csv?
request.format.html?
request.format.ics?
request.format.js?
request.format.json?
request.format.multipart_form?
request.format.rss?
request.format.text?
request.format.url_encoded_form?
request.format.xml?
request.format.yaml?

... and any custom mime types that you add in any environment specific config files.