_search.html.haml

- content_for :javascripts do 
  - cache('search_autocomplete') do
    :javascript
      $(function(){
      var products = #{auto_complete_products.to_json};
        $("#keywords").autocomplete(products,{
            appendToElement: ".autocomplete"
          });

      });

.search.autocomplete
  = form_tag product_search_path, :method => :get do 
    = text_field_tag :keywords, params[:keywords], :placeholder => 'Search for: Gift Cards, Online Coupon Codes, Promos and More...', :class => "small"
    %button{:type => 'submit', :class => 'button secondary search'} 
      %span#top_search Search

application_helper.rb

def auto_complete_products
    product_names = Product.select('distinct products.name').active.on_hand.map(&:name)
    merchant_names = Couponcodes::Merchant.select("distinct store_name").active.by_store_name.map(&:store_name)
    product_source_image = ProductSource.find_by_name("").image(:thumb) #how do i tap into all ProductSource names?
    (product_names + merchant_names + product_source_image).uniq.sort
end