attachment_fields.erb

<%- form_for @album do |album_form| -%>
	<!-- Album Form Stuff -->
	<%-
	# file_fields_for is where the magic happens. You supply the association to the model
	# that has the 'attachment' as well as the property on that model that will receive
	# the file upload data. This will take care of displaying the necessary upload fields
	#
	-%>
	<%= album_form.attachment_fields_for :photos, :data %>
	<%-
	# If you need to display more than just a file field you can provide a block to the
	# file_fields_for helper method, the file_fields_for method will take care of the dirty
	# work and then you can supply and extra helper methods in the block
	-%>
	<%- album_form.attachment_fields_for :photos, :data do |photo_fields| -%>
	<%= photo_fields.attachment_field %>
	<%= photo_fields.checkbox :front %>
	<%- end -%>
<%- end -%>