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/models/sale.rb

@@ -440,7 +440,7 @@ class Sale < ApplicationRecord
 
   #compute - invoice total
   def compute_by_sale_items(total_discount, discount_type=nil, order_source=nil, tax_type=nil, type=nil)
-    shop = Shop.first
+    shop = Shop.current_shop
 
     #Computation Fields
     subtotal_price = 0
@@ -507,7 +507,7 @@ class Sale < ApplicationRecord
 
   # Tax Re-Calculte
   def compute_tax(total_taxable, total_discount = 0, order_source = nil, tax_type=nil)
-    shop = Shop.first
+    shop = Shop.current_shop
 
     #if tax is not apply create new record
     # SaleTax.where("sale_id='#{sale.sale_id}'").find_each do |existing_tax|
@@ -627,7 +627,7 @@ class Sale < ApplicationRecord
 
   # Tax Calculate
   def apply_tax(total_taxable, order_source = nil, tax_type = nil)
-    shop = Shop.first
+    shop = Shop.current_shop
 
     #if tax is not apply create new record
     # SaleTax.where("sale_id='#{self.sale_id}'").find_each do |existing_tax|
@@ -645,7 +645,7 @@ class Sale < ApplicationRecord
       order_source = "cashier"
     end
 
-    # tax_data = TaxProfile.unscoped.where("group_type=?",order_source).pluck(:id)
+    # tax_data = TaxProfile.unscope(:order).where("group_type=?",order_source).pluck(:id)
     # customer = Customer.find(self.customer_id).tax_profiles
 
     tax_profiles = unique_tax_profiles(order_source, self.customer_id)
@@ -710,7 +710,7 @@ class Sale < ApplicationRecord
   end
 
   def adjust_rounding
-    shop_details =  Shop.first
+    shop_details =  Shop.current_shop
       # rounding adjustment
     if shop_details.is_rounding_adj
       new_total = Sale.get_rounding_adjustment(self.grand_total)
@@ -726,7 +726,7 @@ class Sale < ApplicationRecord
   #Generate new Receipt No when it is not assigned
   def generate_receipt_no
     #shop_code and client_code
-    shop_details =  Shop.first
+    shop_details =  Shop.current_shop
     #Date-Shift-
     if self.receipt_no.nil?
       prefix = DateTime.now().utc
@@ -1239,7 +1239,7 @@ end
 
 #product sale report query
 def self.get_menu_item_query(order_by)
-  query = MenuItem.unscoped.select("acc.id as account_id,
+  query = MenuItem.unscope(:order).select("acc.id as account_id,
                       acc.title as account_name,
                       mii.item_instance_code as item_code, " +
                      "(CASE WHEN si.qty IS NOT NULL THEN SUM(si.qty) ELSE 0 END) as total_item," +