gem 'redis','>= 2.1.1'
gem 'chinese_pinyin', '0.4.1'
# add rmmseg if you need search by segment words
gem 'rmmseg-cpp-huacnlee', '0.2.9'
gem 'redis-namespace','~> 1.1.0'
gem 'redis-search', '0.8.0'

$ bundle install

require "redis"
require "redis-namespace"
require "redis-search"
# don't forget change namespace
redis = Redis.new(:host => "127.0.0.1",:port => "6379")
# We suggest you use a special db in Redis, when you need to clear all data, you can use flushdb command to clear them.
redis.select(3)
# Give a special namespace as prefix for Redis key, when your have more than one project used redis-search, this config will make them work fine.
redis = Redis::Namespace.new("your_app_name:redis_search", :redis => redis)
Redis::Search.configure do |config|
  config.redis = redis
  config.complete_max_length = 100
  config.pinyin_match = true
  # use rmmseg, true to disable it, it can save memroy
  config.disable_rmmseg = false
end

class Post
  include Mongoid::Document
  include Redis::Search

  field :title
  field :body
  field :hits

  belongs_to :user
  belongs_to :category

  redis_search_index(:title_field => :title,
                     :score_field => :hits,
                     :condition_fields => [:user_id, :category_id],
                     :ext_fields => [:category_name])

  def category_name
    self.category.name
  end
end

class User
  include Mongoid::Document
  include Redis::Search
  
  field :name
  field :alias_names, :type => Array
  field :tagline
  field :email
  field :followers_count
  
  redis_search_index(:title_field => :name,
	                 :alias_field => :alias_names,
                     :prefix_index_enable => true,
                     :score_field => :followers_count,
                     :ext_fields => [:email,:tagline])
end

class SearchController < ApplicationController
  # GET /searchs?q=title
  def index
    Redis::Search.query("Post", params[:q], :conditions => {:user_id => 12})
  end
  
  # GET /search_users?q=j
  def search_users
    Redis::Search.complete("Post", params[:q], :conditions => {:user_id => 12, :category_id => 4})
  end
end

$ rake redis_search:index