gem 'redis-search'

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 cleanup.
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
end

class Post < ActiveRecord::Base
  include Redis::Search

  belongs_to :user
  belongs_to :category

  redis_search 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 < ActiveRecord::Base
  include Redis::Search

  serialize :alias_names, Array

  redis_search title_field: :name,
               alias_field: :alias_names,
               score_field: :followers_count,
               ext_fields: [:email, :tagline]
end

class SearchController < ApplicationController
  # GET /search_users?q=j
  def search_users
    Post.prefix_match(params[:q], conditions: { user_id: 12, category_id: 4 })
  end
end