Ajax, Multiple Attachments and Paperclip question

Alright everyone this is a bit of a complicated setup so if I need to clarify the question just let me know.

I have a model:

class IconSet < ActiveRecord::Base
  has_many :icon_graphics
end

This Model has many icongraphics:

class IconGraphic < ActiveRecord::Base
  belongs_to :icon_set
  has_attached_file :icon
  has_attached_file :flagged
end

As you can see, IconGraphic has two attached files, basically two different versions of the icon that I want to load.

Now, this setup is working okay if I edit the icongraphic's individually, however, for ease of use, I have all the icon graphics editable under the IconSet. When you edit the icon set the form loads a partial for the icongraphics:

<% form_for @icon_set, :html => {:class => 'nice', :multipart => true} do |f| %>
<fieldset>  
  <%= f.error_messages %>
  <p>
    <%= f.label :name %>
    <%= f.text_field :name, :class => "text_input" %>
  </p>
    <!-- Loaded Partial for icongraphics -->
    <div id="icon_graphics">
        <%= render :partial => 'icon_graphic', :collection => @icon_set.icon_graphics %>        
    </div>
    <div class="add_link">
    <%= link_to_function "Add an Icon" do |page|
        page.insert_html :bottom, :icon_graphics, :partial => 'icon_graphic', :object => IconGraphic.new
    end %>
    </div>
  <p><%= f.submit "Submit" %></p>
</fieldset>
<% end %>

This is based largely off of Ryan's Complex Forms Railscast.

The partial loads the file_field forms:

<div class="icon_graphic">
<% fields_for "icon_set[icon_graphic_attributes][]", icon_graphic do |icon_form|-%>
    <%- if icon_graphic.new_record? -%>
        <strong>Upload Icon: </strong><%= icon_form.file_field :icon, :index => nil %><br/>
        <strong>Upload Flagged Icon: </strong><%= icon_form.file_field :flagged, :index => nil %>
        <%= link_to_function image_tag('remove_16.png'), "this.up('.icon_graphic').remove()"%><br/>
    <% else -%>
        <%= image_tag icon_graphic.icon.url %><br/>
        <strong>Replace <%= icon_graphic.icon_file_name %>: </strong><%= icon_form.file_field :icon, :index => nil %><br />
        <% if icon_graphic.flagged_file_name.blank? -%>
        <strong>Upload Flagged Icon: </strong><%= icon_form.file_field :flagged, :index => nil %>
        <% else -%>
        <strong>Replace <%= icon_graphic.flagged_file_name %>: </strong><%= icon_form.file_field :flagged, :index => nil %>
        <%= icon_form.hidden_field :flagged, :index => nil %>
        <% end -%>
        <%= link_to_function image_tag('remove_16.png'), "mark_for_destroy(this, '.icon_graphic')"%><br/>
        <%= icon_form.hidden_field :id, :index => nil %>
        <%= icon_form.hidden_field :icon, :index => nil %>
        <%= icon_form.hidden_field :should_destroy, :index => nil, :class => 'should_destroy' %>
        <br/><br/>
    <%- end -%>
<% end -%>
</div>

Now, this is looking fine when I add new icons, and fill both fields. However, if I edit the IconSet after the fact, and perhaps try to replace the icon with a new one, or if I uploaded only one of the set and try to add the second attachment, paperclip doesn't put the attachments with the right IconGraphic Model.

It seems that even though I have the IconGraphic ID in each partial,

<%= icon_form.hidden_field :id, :index => nil %>

it seems that paperclip either creates a new IconGraphic or attaches it to the wrong one.

This all happens when you save the Ic开发者_如何学JAVAonSet, which is setup to save the IconGraphic attributes.

I know this is complicated.. I may just have to go to editing each icon individually, but if anyone can help, I would appreciate it.

---

Alright I figured it out. The problem was that the id of each icon needs to come BEFORE the upload fields, not after:

<% else -%>
      <!-- Moved the hidden fields before the upload fields -->
        <%= icon_form.hidden_field :id, :index => nil %>
        <%= icon_form.hidden_field :icon, :index => nil %>
        <%= icon_form.hidden_field :flagged, :index => nil unless icon_graphic.flagged_file_name.blank? %>
        <%= image_tag icon_graphic.icon.url %><%= image_tag icon_graphic.flagged.url unless icon_graphic.flagged_file_name.blank? %><br/>
        <strong>Replace <%= icon_graphic.icon_file_name %>: </strong><%= icon_form.file_field :icon, :index => nil %><br />
        <% if icon_graphic.flagged_file_name.blank? -%>
        <strong>Upload Flagged Icon: </strong><%= icon_form.file_field :flagged, :index => nil %>
        <% else -%>
        <strong>Replace <%= icon_graphic.flagged_file_name %>: </strong><%= icon_form.file_field :flagged, :index => nil %>
        <% end -%>
        <%= link_to_function image_tag('remove_16.png'), "mark_for_destroy(this, '.icon_graphic')"%><br/>
        <%= icon_form.hidden_field :should_destroy, :index => nil, :class => 'should_destroy' %>
        <br/><br/>
<%- end -%>