gistfile1.txt

#application.rb
require "active_record/railtie"

#pry
[3] pry(#<Api::CheckoutsController>)> Api::CheckoutData.new
=> #<Api::CheckoutData id: nil, token: nil, shop_id: nil, transaction_type: nil, created_at: nil, updated_at: nil>

[4] pry(#<Api::CheckoutsController>)> Api::CheckoutData.new({})
NoMethodError: undefined method `safe_constantize' for nil:NilClass
from /Users/aeldreath/.rvm/gems/ruby-2.0.0-p247@global/gems/activerecord-4.0.0/lib/active_record/inheritance.rb:175:in `subclass_from_attrs'

#checkout_data.rb

class Api::CheckoutData < ActiveRecord::Base
  has_one :order
  has_one :shop
  has_one :settings, class_name: 'CheckoutSettings'
  has_one :customer, class_name: 'Address'
  
  accepts_nested_attributes_for :customer, :settings, :order
end

#schema.rb

  create_table "checkout_data", force: true do |t|
    t.string   "token"
    t.integer  "shop_id"
    t.string   "transaction_type"
    t.datetime "created_at"
    t.datetime "updated_at"
  end