nested form "Can't mass-assign protected attributes" - ruby-on-rails

Question

I have 3 models; Quote, Item, and Product.
My quote/new.html.erb is set up to render a partial which contains the item form, and in that item form a partial is rendered to choose a product.
the error: ActiveModel::MassAssignmentSecurity::Error in QuotesController#create
"Can't mass-assign protected attributes: products"
(I edited out irrelevant stuff in the following)
Quote.rb
class Quote < ActiveRecord::Base
attr_accessible :items_attributes
has_many :items, :dependent => :destroy
accepts_nested_attributes_for :items
end
Item.rb
class Item < ActiveRecord::Base
attr_accessible :price, :product_attributes
belongs_to :quote
belongs_to :product
accepts_nested_attributes_for :product
end
Product.rb
class Product < ActiveRecord::Base
attr_accessible :name, :item_make
has_many :items
accepts_nested_attributes_for :items
end
new.html.erb
<%= simple_nested_form_for #quote do |m| %>
<%= m.simple_fields_for :items, :html => { :multipart => true } do |quoteform| %>
<%= render "form", f: quoteform %>
<% end %>
<%= m.link_to_add "Add an item", :items %>
<%= m.button :submit %>
<% end %>
_form.html.erb
<%= f.simple_fields_for :products, :html => { :multipart => true } do |x| %>
<% render "layouts/styleselect", g: x %>
<% end %>
_styleselect.html.erb
<% g.hidden_field :item_make, :value => #item.make %>
<%= g.input :name, collection: Product.where(:item_make => 1), label: false, input_html: {:id=>"sst_style"} %>
So basically the nested form goes Quote->Item->Product, but item belongs to product, which maybe is causing the problem? I tried adding product_attributes or products_attributes to both the item model and the quote model, and the same with accepts_nested_attributes_for product(s).
Any help would be appreciated, thanks.

Answer 1

Looks like you need to make products singular.
<%= f.simple_fields_for :product, :html => { :multipart => true } do |x| %>
<% render "layouts/styleselect", g: x %>
<% end %>
You currently have:
<%= f.simple_fields_for :products, :html => { :multipart => true } do |x| %>