Ruby on Rails recommendable

Rails的推荐系统中recommendable算是比较好的一个。

gem：

https://github.com/davidcelis/recommendable

demo：

https://github.com/tka/recommender-demo

安装 Redis：

Mac OS X下：

brew install redis

Linux下：

sudo apt-get install redis-server

在Gemfile中加入：

gem 'sidekiq'
gem 'recommendable'

安装gem

bundle install

新增config/initializers/recommendable.rb

require 'redis'

Recommendable.configure do |config|
  # Recommendable's connection to Redis.
  #
  # Default: localhost:6379/0
  config.redis = Redis.new(:host => 'localhost', :port => 6379, :db => 0)

  # A prefix for all keys Recommendable uses.
  #
  # Default: recommendable
  config.redis_namespace = :recommendable

  # Whether or not to automatically enqueue users to have their recommendations
  # refreshed after they like/dislike an item.
  #
  # Default: true
  config.auto_enqueue = true

  # The number of nearest neighbors (k-NN) to check when updating
  # recommendations for a user. Set to `nil` if you want to check all
  # neighbors as opposed to a subset of the nearest ones. Set this to a lower
  # number to improve Redis memory usage.
  #
  # Default: nil
  config.nearest_neighbors = nil

  # Like kNN, but also uses some number of most dissimilar users when
  # updating recommendations for a user. Because, hey, disagreements are
  # just as important as agreements, right? If `nearest_neighbors` is set to
  # `nil`, this configuration is ignored. Set this to a lower number
  # to improve Redis memory usage.
  #
  # Default: nil
  config.furthest_neighbors = nil

  # The number of recommendations to store per user. Set this to a lower
  # number to improve Redis memory usage.
  #
  # Default: 100
  config.recommendations_to_store = 100
end

在你的model中加入类似这种代码：

class Video < ActiveRecord::Base
  recommends :video_tags, :career

  # ...
end

启动顺序：

redis-server sidekiq -q recommendable

编写命令：

task :videos_to_recommendable => :environment do
  Video.last(10).each do |v|
    puts "video: #{v.id}"

    v.like(v.career)

    v.video_tags.each do |video_tag|
      v.like(video_tag)
    end
  end
end

执行命令：

rake videos_to_recommendable