Validate Attachment Content Type Paperclip

Question

Is it possible to enforce a \'content type\' validation in paperclip without enforcing a \'presence\' validation (i.e. allow blanks)? I currently have:

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Answer 1

validates_content_type accepts :if => Proc.new{|r| !r.content_type.blank?} in it's options hash, perhaps that would solve your problem.

http://rdoc.info/github/thoughtbot/paperclip#