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/home_controller.rb

@@ -91,7 +91,7 @@ class HomeController < ApplicationController
   def dashboard
     @from, @to = get_date_range_from_params
 
-    @shop = Shop.first
+    @shop = Shop.current_shop
 
     @orders = Sale.receipt_date_between(@from, @to).where("payment_status = 'new' and sale_status = 'bill'")
     @sales = Sale.receipt_date_between(@from, @to).completed