ActiveRecord without Rails, e.g. in a script

active_record_basic_setup.rb

require 'active_record'
ActiveRecord::Base.establish_connection( adapter: 'sqlite3', database: ":memory:" )
ActiveRecord::Migration.verbose = false
ActiveRecord::Schema.define(version: 1) { create_table(:articles) { |t| t.string :title } }

class Article < ActiveRecord::Base; end

Article.create title: 'Quick brown fox'
Article.create title: 'Fast black dogs'
Article.create title: 'Swift green frogs'

Source: https://github.com/elasticsearch/elasticsearch-rails/blob/master/elasticsearch-model/README.md#usage