Perpetuity + Virtus creates only one table in pg

customer.rb

require 'perpetuity/postgres'
require 'securerandom'
require 'pp'
require 'virtus'

Perpetuity.data_source :postgres, 'foo', username: 'anthony', host: 'localhost', port: 5432, password: ''

class Entity
  include Virtus.model

  attribute :id, Integer
end

module Customer
  class Account < Entity
    attribute :oauth_token, String
    attribute :provider, String
  end

  class User < Entity
    attribute :name, String
    attribute :email, String
    attribute :api_key, String
    attribute :accounts, Array[Account]
  end
end

Perpetuity.generate_mapper_for Customer::User do
  attribute :name, type: String
  attribute :email, type: String
  attribute :api_key, type: String
  attribute :accounts
  index :api_key
end

Perpetuity.generate_mapper_for Customer::Account do
  attribute :oauth_token, type: String
  attribute :provider, type: String

  index :oauth_token
end

account = Customer::Account.new(oauth_token: SecureRandom.hex,
                                provider: 'linkedtwitface')

me = Customer::User.new(name: 'Jamie',
                        email: 'jgaskins@gmail.com',
                        api_key: SecureRandom.hex,
                        accounts: [account])

user_mapper = Perpetuity[Customer::User]

id = user_mapper.insert(me)

retrieved_user = user_mapper.find(id)
user_mapper.load_association! retrieved_user, :accounts

pp retrieved_user
#<Customer::User:0x007fee33e18ba0 @name="Jamie", @email="jgaskins@gmail.com", @api_key="0ae800b2282fdca5d496d5843b1c0fbc", @accounts=[nil], @id="a9c4ad1c-0fad-4e19-8bbf-83c07b4c3de9">