How can I rename all the existing carrierwave uploaded files?

[hau]

I have been using Carrierwave for file uploads for some time. I did not try to rename the files as they got uploaded. Now I want to give each file a random name and a file extension that's consistent with the content type. I read the wiki and other sites, and it was recommended that in the uploader, I could: def filename "#{secure_token}.#{file.extension}" if original_filename.present? end private def secure_token #implement the secure token end It worked fine on files uploaded after these additions to the uploader. But I got many files that were uploaded before this change. I was wondering if someone could tell me how to migrate the old files. I tried adding a method to the uploader: def rename_file! model.update_attribute mounted_as, "#{secure_token}.#{file.extension}" recreate_versions! end then in the rails console, I tried calling this on an model with attachment. However, I found that the mounted_as column of the model never got updated, though on the file system, various versions of the file were created with the new name. When I inspected the mounted_as field of the model, it did not get updated. The log actually said the column was updated with the old value. How can I get the mounted_as column on the model updated? In addition, it seemed like the old files with the old names were still on the file system. Is there a way to remove them? I tried adding a line: file.move_to File.join("#{File.dirname file.path}, "#{secure_token}.#{file.extension}") in the rename_file! method. It renamed the files, but did not update the mounted_as column on the model. So accessing its URL resulted in a 404.