Rails 4 / Algolia setup for indexing a model

algolia.rb

# config/initializers/algolia.rb
AlgoliaSearch.configuration = {
  application_id: ENV["ALGOLIA_APPLICATION_ID"],
  api_key:        ENV["ALGOLIA_ADMIN_API_KEY"]
}

gemfile

gem "algoliasearch-rails",          "~> 1.18.0"

post.rb

# app/models/post.rb
class Note < ActiveRecord::Base
  include AlgoliaSearch
  
  algoliasearch sanitize: true, index_name: ENV['ALGOLIA_INDEX_NAME'] do
    attributes :title, :content
    searchableAttributes ['title', 'content']
    tags do
      [
        "user_#{self.user.token}"
      ]
    end
  end
end