[Rails] accepts_nested_attributes_for and fields_for not working!

[Sarah]

I want to be able to create one menu object that has fields_for :brunch, 
:lunch, and :dinner. The menu object has_many brunches, lunches, and 
dinners, but each time I "edit", only one brunch, one lunch, and one dinner 
object are added. I'm using carrierwave to upload brunch_menus, 
lunch_menus, and dinner_menus (attributes of brunches, lunches, and dinners 
respectively) as pdfs to amazon s3 and viewing them as iframes. When I try 
to save a menu object, the menu object gets created and saved, but its 
brunch, lunch and dinner don't get created when I edit it. When i run 
Brunch.all i get []

Thanks!
Sarah

Menu Controller:
before_filter :authenticate_admin!, :except => [:show]
  def edit
    @menu = Menu.find(params[:id])
    @menu.dinners.build
    @menu.lunches.build
    @menu.brunches.build
  end


Menu Model:
class Menu < ActiveRecord::Base
  has_many :brunches, :dependent => :destroy
  has_many :lunches, :dependent => :destroy
  has_many :dinners, :dependent => :destroy
  accepts_nested_attributes_for :lunches, :dinners, :brunches
end


Brunch, lunch, dinner models:
class Lunch < ActiveRecord::Base
  attr_accessible :menu_id, :lunch_menu
  belongs_to :menu
  mount_uploader :lunch_menu, ImageUploader
end



Menu Form:
<%= form_for @menu, :html => {:multipart => true} do |f| %>
  <% if @menu.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@menu.errors.count, "error") %> prohibited this 
menu from being saved:</h2>

      <ul>
      <% @menu.errors.full_messages.each do |msg| %>
        <li><%= msg %></li>
      <% end %>
      </ul>
    </div>
  <% end %>
<%= f.fields_for :brunches do |a|%>
  <div class="field">
    <%= a.label :brunch_menu %><br />
    <%= a.file_field :brunch_menu %>
  </div>
<% end %>
<%= f.fields_for :lunches do |a|%>
  <div class="field">
    <%= a.label :lunch_menu %><br />
    <%= a.file_field :lunch_menu %>
  </div>
<% end %>
<%= f.fields_for :dinners do |a|%>
  <div class="field">
    <%= a.label :dinner_menu %><br />
    <%= a.file_field :dinner_menu %>
  </div>
<% end %>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

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