gistfile1.rb

  def size_upload
    result = {:export => {use: []}}
    return result unless self.uploads_enabled?

    result[:resize] = result[:encode] = {
      width: self.upload_width,
      height: self.upload_height
    } if self.upload_width?  && self.upload_height?

    result[:resize_thumb] = result[:encode_thumb] = {
      width: self.upload_thumb_width,
      height: self.upload_thumb_height
    } if self.upload_thumb_width? && self.upload_thumb_height?


    result[:export][:use].push("resize").push("resize_thumb") if self.enable_images?
    result[:export][:use].push("encode").push("encode_thumb") if self.enable_videos?
    
    result
  end