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

This worked for me;

validates_attachment :image1, :presence => true,
                         :content_type => { :content_type => "image/jpg" },
                         :size => { :in => 0..10.kilobytes }