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Editorial Team
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Asked: 2026-05-16T11:15:09+00:00

Setting up paperclip to use S3 on my local dev system was a snap.

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Setting up paperclip to use S3 on my local dev system was a snap. However, I am not able to get it to work on Heroku.

The file uploads successfully:

[paperclip] Saving attachments.
[paperclip] saving photos/2/small.jpg
[paperclip] saving photos/2/original.jpg

However, views that try to link to the upload get a routing error:

ActionController::RoutingError (No route matches "/photos/small/missing.png" with {:method=>:get}):

Notice how it is using ‘missing’ for the file name and is using ‘.png’ for the extension even though the file is a ‘.jpg’.

I have tried numerous combinations of the :url and :path options with has_attached_file according the various blog posts and tutorials I have found (including Heroku’s docs), but none seem to work.

What are the correct steps to use paperclip with S3 on Heroku?

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1 Answer

  1. Editorial Team

    Found the problem: needed to update the database.

    heroku rake:db:migrate
heroku restart

    I had done what I thought would have accomplished the same thing already: heroku rake db:schema:load, but perhaps that doesn’t work or something went wrong in the process.

    Anyhow, doing that, along with removing the calls to attr_accessor as suggested on another blog, solved the problem.

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