Single database for multiple shops

Use ActsAsTenant as Multi-tenancy for shops

See below files:
- app/controllers/concern/multi_tenancy.rb
- app/models/application_record.rb
- app/models/shop.rb

An initializer can be created to control option in ActsAsTenant.
config/initializers/acts_as_tenant.rb
require 'acts_as_tenant/sidekiq'
ActsAsTenant.configure do |config|
  config.require_tenant = false # true
end

more details: https://github.com/ErwinM/acts_as_tenant

app/controllers/api/order_reserve/order_reservation_controller.rb

@@ -70,7 +70,7 @@ class Api::OrderReserve::OrderReservationController < Api::ApiController
 			order_reservation_id, flag = OrderReservation.addOrderReservationInfo(order_reservation)
 
 			if !order_reservation_id.nil? && flag
-				shop = Shop.find_by_id(1)
+				shop = Shop.current_shop
 				if !shop.nil?
 					shop_code = shop.shop_code
 					order_audio = DisplayImage.find_by_shop_id_and_name(shop.id, "order_audio")