Refile Input gem adds custom input type to formtastic to use refile file uploader. Well, name is self-explanatory and gem is super-simple. It's built upon refile's input helper.

Add the gem:

gem "refile-input", require: ["inputs/refile_input"]

Use the gem:

form do |f|
  f.input :image, as: :refile
end

Gem brings support of the following options:

• direct determines whether file should be uploaded asynchronously or not. Uploading host might be changed with host option. More about it read in refile documentation. Note that refile's js should be included on the page.
• image_preview is an option to generate image preview. As arguments it accepts list of refile attachment_url options. Read more here.
• all formtastic's options such as hint, label, etc.

MIT