def populate_metadata(id)
      extract_metadata(id).each do |k, v|
        send("#{k}=".to_sym, v) # set each property
      end
    end
def populate_metadata(id)
      extract_metadata(id).each do |k, v|
        send("#{k}=".to_sym, v) # set each property
      end
    end
Sets properties from the constitutent external metadata file