Rails中使用elasticsearch全文搜索引擎

安装好elasticsearch

http://www.liubaicai.net/articles/747 有介绍</p>

首先引入gem

gem 'elasticsearch-model'
gem 'elasticsearch-rails'
gem 'elasticsearch-persistence'

然后新建一个lib/tasks/elasticssearch.rake中</p>

require 'elasticsearch/rails/tasks/import'

为数据库表添加索引的迁移

class AddIndexsToArticles < ActiveRecord::Migration
  def change
    add_index :articles, :title
    add_index :articles, :content
  end
end

扩展model类</h3>

class Article < ActiveRecord::Base
  include Elasticsearch::Model
  include Elasticsearch::Model::Callbacks

  mapping dynamic: false do
    indexes :title
    indexes :content
  end
end

也可以定制json输出的内容，比如关联表数据等

def as_indexed_json(options={})
   self.as_json(
     only: [:id, :name, :description, :status],   
     include: { tags: { only: [:name]}}
   )
 end

执行

rake environment elasticsearch:import:model CLASS='Article' FORCE=y

最后</p>

bundle install & rake db:migrate

就可以愉快的搜索了</p></blockquote>

articles = Article.search('苟利国家生死以').results

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