Using ActiveRecord outside of a Rails app

active_record_outside_of_rails.rb

require 'active_record'
require 'mysql2'

# Database Connection
ActiveRecord::Base.establish_connection(
  adapter:  'mysql2', # or 'postgresql' or 'sqlite3'
  host:     'localhost',
  database: 'chc_user_auth_direct_login',
  username: 'root',
  password: ''
)

# Database Class
class User < ActiveRecord::Base
  rolify
  # Include default devise modules. Others available are:
  # :token_authenticatable, :confirmable,
  # :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable

  # Setup accessible (or protected) attributes for your model
  attr_accessible :role_ids, :as => :admin
  attr_accessible :name, :email, :password, :password_confirmation, :remember_me
end

# Now do stuff with it
puts SomeClass.find :all
some_class = SomeClass.new