I have a PDF processor on some of my paperclip attachments. It only supports making images from PDF files so I dont want to use the processor if its not an PDF.
You need to use a lambda to do this.
class Post < ActiveRecord::Base
has_attached_file :doc,
styles: lambda{|attachment| attachment.instance.doc.content_type == 'application/pdf' ? {thumb: "50x50>", preview: '800x600>'} : {} }
processors: lambda{|instance| instance.doc.content_type == 'application/pdf' ? [:thumbnail, :ghostscript] : [] }
end
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