autocomplete example

example.rb

# Controller

class PostsController < ApplicationController
  before_filter :authenticate_user!, :except => [:show, :index]
  autocomplete :tag, :name
end

# Routes:

resources :posts do
  get :autocomplete_tag_name, :on => :collection
end

# Form

form_for @post do |f|
  f.autocomplete_field :tag_name, autocomplete_tag_name_posts_path
end