ruby on rails - get 5 random favorites from flickr -

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I need to retrieve 5 random favorite photos from Flickr profile.

Work with the Flickr API.

And it . Using the Favorites method works great, I can get the full list of user's favorite photos.

This is Flickr :: PhotoCollection and I do not know how to get 5 random records from it.

Thanks in advance! 

  user.favorites.sort_by {rand} [0..4] = "Post-text" itemprop = "text">

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