Question

Paperclip by default try to process every image file to generate thumbnail. But it also try to do it with pdf files, which can be really time consuming task. I tried looking on google and found one solution, but it changes Paperclip methods.

How to disable pdf postprocessing in Paperclip without changing Paperclip sources?

Answer 1

From my current production app, similar to above, but explicitly looks for images (in this case my uploader pretty much accepts any type of file, so I process only images and ignore all others):

before_post_process :is_image?

def is_image?
  ["image/jpeg", "image/pjpeg", "image/png", "image/x-png", "image/gif"].include?(self.asset_content_type) 
end