How do you autocomplete from another model?

I followed the Railscast on Auto-complete Associations but i am stuck at the autocomplete half. I am not using Prototype but Jquery instead and i don't know how to get the autocomplete half working. How is it done?

This is the customization compared to what the Railscast has:

Products Model:

def location_name
    location.business_name if location
end

def location_name=(business_name)
    self.location = Location.find_by_business_name(business_name) unless business_name.blank?
end

The above makes a virtual attribute in which i defined my Location models :business_name into location_name for the <%= f.text_field :location_name %> of my products form because a product belongs to a Location.

EDIT: This was using the Jquery Autocomplete Gem but i am open to alternatives.

My product :name works a charm;

<%= f.autocomplete_field :name, autocomplete_product_name_products_path %>

But if i put something like this for :location_name its no g开发者_如何学运维ood;

<%= f.autocomplete_field :location_name, autocomplete_product_location_name_products_path %>

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It was simple, had to add attr_accessor, this is my finished code from another project:

<%= form_for(@business_address) do |f| %>
    <%= f.error_messages %>
    <%= f.label :name, "Address" %><br />
    <%= f.autocomplete_field :name, autocomplete_business_address_name_business_addresses_path %>
    <%= f.label :business_name, "Business" %>
    <%= f.autocomplete_field :business_name, autocomplete_business_name_business_addresses_path %>
    <%= f.submit %>
<% end %


class BusinessAddress < ActiveRecord::Base
    attr_accessible :name, :business_name
    belongs_to :business
    attr_accessor :business_name


    def business_name
        business.name if business
    end

    def business_name=(name)
        self.business = Business.find_or_create_by_name(name) unless name.blank?
    end
end

class BusinessAddressesController
  autocomplete :business, :name, :full => true
  autocomplete :business_address, :name, :full => true
end

Routes.rb

resources :business_addresses do
        get :autocomplete_business_name, :on => :collection
        get :autocomplete_business_address_name, :on => :collection
end

Make sure you specify in your application layout the files needed or for some strange reason it won't work (rails 3.0.9)

<%= javascript_include_tag "autocomplete-rails", "jquery-ui-1.8.16.custom.min" %>

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I am not sure, but have you tried using autocomplete_location_location_name_products_path?

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Since i couldn't get the Autocomplete working for the Jquery-Autocomplete i just started using Jquery-TokenInput plugin for my locations and just set the Limit to 1 Token only, i learned a lot from the Railscasts too.