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If you’ve ever wanted to keep track of revisions to document files or images in your Rails app, you are likely to want to use Acts_as_versioned, which is the authority on versioning database records, and Attachment_fu, which is the authority on uploading files with Rails. The problem is that they don’t know about each other and will step on each other’s toes without some changes. This article serves as a quick introduction to each, and shows how to make the two plugins get along like best friends.