def update_from_field(field_name)
      if fields[field_name].localized?
        read_attribute(field_name).to_a.map { |lang, value| cast_value(value, language: lang) }.flatten
      else
        cast_value send(field_name)
      end
    end
def update_from_field(field_name)
      if fields[field_name].localized?
        read_attribute(field_name).to_a.map { |lang, value| cast_value(value, language: lang) }.flatten
      else
        cast_value send(field_name)
      end
    end
Update the delegated ActiveTriples::Resource from a field

 @param [String] field_name ActiveModel attribute name for the field
 @return [Object]