Doppeltes geschachteltes Modell Formen

Ich habe noch immer Probleme mit verschachtelten Formen. Hier ist mein form-code:

<%= form_for @account do |f| %>

<%= f.label :account_type %><br />
<%= f.text_field :account_type %><br />

    <%= f.fields_for :organizations do |builder| %>
        <%= builder.label :name %><br />
        <%= builder.text_field :name %><br />
        <%= builder.label :website %><br />
        <%= builder.text_field :website %><br />

        <%= f.fields_for :locations do |builder| %>
            <%= builder.label :phone %><br />
            <%= builder.text_field :phone %><br />
            <%= builder.label :toll_free_phone %><br />
            <%= builder.text_field :toll_free_phone %><br />
            <%= builder.label :fax %><br />
            <%= builder.text_field :fax %><br />
        <% end %>
    <% end %>

<%= f.submit "Add account" %>
<% end %>

Konto Modell:

class Account < ActiveRecord::Base

has_many :organizations

accepts_nested_attributes_for :organizations
end

Organisationsmodell:

class Organization < ActiveRecord::Base

belongs_to :account

has_many :locations

accepts_nested_attributes_for :locations
end

Und die Lage Modell:

class Location < ActiveRecord::Base

belongs_to :organization

end

Und schließlich die Konten Controller:

class AccountsController < ApplicationController

def new
    @account = Account.new
    organization = @account.organizations.build
    organization.locations.build

    @header = "Create account"
end

def create
    @account = Account.new(params[:account])
    if @account.save
        #handle success
    else
        render 'new'
    end
end
end

Hier ist die Fehlermeldung die ich erhalte:

ActiveRecord::UnknownAttributeError in AccountsController#create

unknown attribute: locations
Rails.root: C:/Documents and Settings/Corey Quillen/My       
Documents/rails_projects/shop_manager

Application Trace | Framework Trace | Full Trace
app/controllers/accounts_controller.rb:12:in `new'
app/controllers/accounts_controller.rb:12:in `create'
Request

Parameters:

{"utf8"=>"✓",
 "authenticity_token"=>"xuZLSP+PSjdra3v51nIkJYZeXRM0X88iF135hPlp4sc=",
 "account"=>{"account_type"=>"Company",
 "organizations_attributes"=>{"0"=>{"name"=>"Atlas",
 "website"=>"www.atlas.com"}},
 "locations"=>{"phone"=>"555-555-5555",
 "toll_free_phone"=>"800-555-5555",
 "fax"=>"512-555-5555"}},
 "commit"=>"Add account"}

Jede Hilfe für diese wird sehr geschätzt werden. Ich schaue mir das jetzt seit ein paar Stunden.