Paperclip - exclude zip, rar from cropping

I have an Attachment model, which is using Paperclip to handle uploaded files. The file can be anything an image, a txt, doc, pdf, rar, zip, tar etc.

I want t开发者_StackOverflow中文版o create thumbnails only if the file uploaded is an image.

How to create thumbnails in Paperclip conditionally based upon file content_type

This is a nice solution:

before_post_process :image?
def image?
  !(data_content_type =~ /^image.*/).nil?
end

You can also use the image? method in your views to either render an image_tag, or something else...