Minimal Inventory Example.

Try this code using ‘rails c`

salesman = Salesman.create({
  :name => "Ricardo",
  :last_name => "Guillen"
})

product = Product.create({
  :name => "My Product",
  :qty => 10
})

sale = salesman.sales.create

product_sale = sale.product_sales.new

product_sale.product = product

product_sale.qty = 5

product_sale.save