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This project demonstrates a bug with Delayed Paperclip that is not present with regular (non-delayed) Paperclip gem.

see Image model for details. Image uses a ‘processor’ to rotate the attachment by passing options to Imagemagick. However those options are not passed when using delayed_paperclip.

Here is Paperclip Thumbnail processor and documentation:

[github.com/thoughtbot/paperclip#custom-attachment-processors](https://github.com/thoughtbot/paperclip#custom-attachment-processors)

[(github.com/thoughtbot/paperclip/blob/master/lib/paperclip/thumbnail.rb](https://github.com/thoughtbot/paperclip/blob/master/lib/paperclip/thumbnail.rb)

You will need to set these environment variables to configure S3 storage:

  • PAPERCLIP_CLOUDFRONT_HOST

  • PAPERCLIP_AWS_BUCKET

  • PAPERCLIP_AWS_REGION

  • AWS_ACCESS_KEY_ID

  • AWS_SECRET_ACCESS_KEY

To demonstrate this bug, first comment out the line in app/models/image.rb:

#process_in_background

then in rails console:

i = Image.new

i.rotate = 90

i.attachment = URI.parse("someimageurl.jpg")

i.save

and note that in logs/development.log, you see something like this (note ‘rotate 90’ is passed to imagemagick ‘convert’ command):

<tt>Command

convert ‘/var/folders/9w/f7r7st_x52d9j7h26rvxnqtw3905xq/T/31a169fda868e4dd6c879cfaf2609ef620160406-39732-1sjeifq’ -rotate 90 -auto-orient -resize “50x” -crop “50x50+0+8” +repage -quality 60 ‘/var/folders/9w/f7r7st_x52d9j7h26rvxnqtw3905xq/T/9971431f00d25acde1138f58da6f433220160406-39732-1rz6j1z’</tt>

Now to show this doesn’t work with delayed_paperclip, uncomment the line: process_in_background in app/models/image.rb, and run the same commands in console. This time, notice that the log shows DelayedPaperclip running ‘convert’ without the specified options:

<tt> [DelayedPaperclip::Jobs::ActiveJob] [5c73221b-83da-453d-901b-5c2802a2ec1d] Command

convert ‘/var/folders/9w/f7r7st_x52d9j7h26rvxnqtw3905xq/T/0b7318c1d94b859bb9dee454aeb2db2c20160406-60232-13c47mv.jpg’ -auto-orient -quality 100 ‘/var/folders/9w/f7r7st_x52d9j7h26rvxnqtw3905xq/T/f752a347e4d253473135691e727d658420160406-60232-1hz90tc’</tt>

you can also run i.attachment.url to get the s3 url to see the file rotated (or not) visually.