How to get Jquery UI Autocomplete working with Rails 4?

Question

I'm using Rails 4.0.2 with jquery-rails (3.1.0) and jquery-ui-rails (4.1.1) gems. I'm trying to add Autocomplete to the search form (using Bootstrap 3.1.0):

<%= form_tag products_path, method: :get, class: 'navbar-form navbar-left' do %>
   <div class='form-group'>
     <%= text_field_tag :query, params[:query], id: "navbar-search-input", class: 'form-control', placeholder: 'Product name.....' %>
   </div>
   <%= button_tag(type: 'submit', id: 'navbar-search-btn', class: 'btn btn-default') do %>
     <i class='fa fa-search fa-fw'></i> Search
   <% end %>  
<% end %>

Here are my application JS and CSS files:

application.js

//= require jquery
//= require jquery_ujs
//= require jquery.ui.autocomplete
//= require turbolinks
//= require_tree .

var ready;
ready = (function() {
  $('a[href="' + this.location.pathname + '"]').parent().addClass('active');
  $("#navbar-search-input").autocomplete({
    source: '/products/autocomplete.json',
  });
});

$(document).ready(ready);
$(document).on('page:load', ready);

application.css.scss

*= require bootstrap
*= font-kit-rails/ubuntu
*= require jquery.ui.autocomplete
*= require_self
*= require_tree .

Than my controller and route for the autocompletion:

class ProductsController < ApplicationController

  def autocomplete
    @products = Product.order(:name)
    respond_to do |format|
      format.html
      format.json { 
        render json: @products.where("name ILIKE ?", "%#{params[:q]}%")
      }
    end
  end

routes.rb

  resources :products do
    collection do
      get 'autocomplete'
    end
  end

Now with all of this, my json file with all of my products at /products/autocomplete.json are there. The problem is if I type in anything, it gives me a blank dropdown and if I click on any area of the dropdown it will reset the search form field. Do you know how to get this to work?

EDIT

NOTE: I have a Product named Rice

Started GET "/products/autocomplete.json?term=ric" for 127.0.0.1 at 2014-03-19 10:06:51 -0400
Processing by ProductsController#autocomplete as JSON
  Parameters: {"term"=>"ric"}
  Product Load (0.9ms)  SELECT "products".* FROM "products" WHERE (name ILIKE '%%') ORDER BY "products"."name" ASC
Completed 200 OK in 16ms (Views: 14.3ms | ActiveRecord: 0.9ms | Search: 0.0ms)

Answer 1

  def autocomplete
    @products = Product.order(:name).where("name LIKE ?", "%#{params[:term]}%")
    respond_to do |format|
      format.html
      format.json { 
        render json: @products.map(&:name).to_json
      }
    end
  end

Answer 2

Judging by your note, it looks like you're not fetching the param correctly in your controller, so try:

render json: @products.where("name ILIKE ?", "%#{params[:term]}%")