Smarter paperclip validations

Question

I\'m using paperclip in a rails app and have the following three validations in my model

validates_attachment_presence :photo                    
validates_a         


        

Answer 1

validates_attachment_size :photo, :less_than => 1.megabyte, 
  :unless => Proc.new { |imports| imports.photo_file_name.blank? }