forms with has_many, using fields_for + Paperclip

I know rails has super easy ways of doing this but I'm not sure exactly how.

I have one model "LineItems" which has_many :order_attachments. OrderAttachment is using paperclip, but I'm thinking this would be the same regardless. I'm wondering. In my LineItem "new" view how can I add one (or more) OrderAttachment within the same form.

Lets say LineItem has an "order_name" attribute. And each OrderAttachment has a "attachment" (which is currently a paperclip attachment). I'm doing the following, and the image gets uploaded in the log, but never saves to OrderAttachment. Any ideas? Is this the correct way to do it? Also (if anyone knows off hand) is there a quick way to expand this so the user can upload as many attachments as they want?

<%= form_for(@line_item, :html => { :multipart => true }) do |f| %>   <%= fields_for :order_attachments do |attachment_form| %>      <%= attachment_form.file_field :attachment %>   <% end %>   <%= f.text_field :item_name %>   <%= f.submit %> <% end %>

Found a solution here: http://sleekd.com/general/adding-multiple-images-to-a-rails-model-with-paperclip/

I had to add this to my LineItem new action:

1.times {@line_item.order_attachments.build}

Also I was using fields_for instead of f.fields_for

Now I just need to allow users to upload more if they want. Anyone know of a simple JS plugin to add more fields_for items? I suppose I could write one but I would think there's one out there..

I’m not sure, but maybe this railcast could help you:

http://railscasts.com/episodes/74-complex-forms-part-2

#74

  Complex Forms Part 2
  Oct 08, 2007 |

8 minutes | Forms, Ajax, Views

See how to use Javascript and RJS to add and remove form fields dynamically. This episode will build upon the previous episode allowing you to create any number of tasks in one form the same time a project is created.