inventory development

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