inventory development

app/models/inventory_definition.rb

@@ -1,2 +1,39 @@
 class InventoryDefinition < ApplicationRecord
+
+  scope :active, -> {where(:is_active => true)}
+
+  def calculate_product_count(saleObj)
+    saleObj.sale_items.each do |item|
+      found, inventory_definition = find_product_in_inventory(item)
+      if found
+        check_balance(item,inventory_definition)
+      end
+    end
+  end
+
+  def self.find_product_in_inventory(item)
+    product = InventoryDefinition.find_by_item_code(item.product_code)
+    if product.nil?
+      return false, nil
+    else
+      return true, product
+    end
+  end
+
+  def self.check_balance(item,inventory_definition)
+     stock = StockJournal.where('item_code=?', item.item_code).order('created_at desc').take
+     unless stock.nil?
+       modify_balance(item, stock.balance, inventory_definition)
+     end
+  end
+
+  def self.modify_balance(item, stock_balance, inventory_definition)
+     if stock.balance.to_i >= item.qty
+       puts ">> stock is greater than orde qty"
+       add_to_journal(item, balance, "ok", inventory_definition)
+     else
+       puts " << stock is less than order qty"
+       add_to_journal(item, balance, "out of stock", inventory_definition)
+     end
+  end
 end

app/models/sale.rb

@@ -117,6 +117,7 @@ class Sale < ApplicationRecord
         create_saleitem_diningcharges(charges, diningprice, booking.dining_facility.name, dining_time)
       end
 
+      InventoryJob.perform_later(self.id)
       return true, self.id
     end
 

app/models/stock_journal.rb

@@ -1,2 +1,24 @@
 class StockJournal < ApplicationRecord
+
+  SALES_TRANS = "sale"
+  STOCK_CHECK_TRANS = "stock_check"
+
+  def add_to_journal(item, balance, stock_message, inventory_definition)
+
+    balance = calculate_balance(balance, item.qty)
+
+    journal = StockJournal.new
+    journal.item_code = item.item_code
+    journal.inventory_definition_id = inventory_definition.id
+    journal.debit = item.qty
+    journal.balance = balance
+    journal.remark = stock_message
+    journal.trans_ref = item.id
+    journal.trans_type = StockJournal::SALES_TRANS
+  end
+
+  def self.calculate_balance(balance, qty)
+    return balance.to_i - qty.to_i
+  end
+
 end