field = RailsAdmin::Config::Fields::Types.load(:dragonfly).new(parent, attachment_name, properties)
    children_fields = []
    extensions.each do |ext|
      children_column_name = :"#{attachment_name}_#{ext}"
      child_properties = parent.abstract_model.properties.detect { |p| p.name.to_s == children_column_name.to_s }