Question

In my Rails app I would like to allow users to upload either image or non-image files via Carrierwave. Currently Carrierwave is working fine handeling and processing image files, but unfortunately its dropping non-images files completely. Is there a clean way for a single Carrierwave uploader to process both image and non-image files?

I’ll include my current uploader below:

class AssetUploader < CarrierWave::Uploader::Base

  include CarrierWave::MiniMagick

  storage :file

  def store_dir
    "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  end

  version :thumb do
   process :resize_to_fill => [300, 300]
  end

  version :icon do
   process :resize_to_fill => [48, 48]
  end

  def extension_white_list
    %w(jpg jpeg gif png pdf doc xls docx xlsx ppt)
  end

end

Answer 1

I had this exact problem. I solved it with the hoary comp sci solution of one-more-level-of-indirection: a trampoline/thunk method that dynamically decides whether to process based on file extension.

You can find the implementation here: https://gist.github.com/995663

(the naive approach of introducing logic in the version block actually doesn’t work because of how the CarrierWave DSL works – the logic needs to be deferred until invocation)

I hope that helps.