Fix chapter 8 - NoMethodError undefined method products

[notapatch]

I got stuck on Chapter 08. On the "Decrementing product quantity" section. I was entering the listing 124

# ...
class Api::V1::OrdersControllerTest < ActionDispatch::IntegrationTest
  setup do
    @order = orders(:one)    # <=== BAD
    @order_params = {
      order: {
        product_ids_and_quantities: [
          { product_id: products(:one).id, quantity: 2 },
          { product_id: products(:two).id, quantity: 3 },
        ]
      }
    }
  end

Which caused the error:

Error:
Api::V1::OrdersControllerTest#test_should_show_order:
NoMethodError: undefined method `products' for #<Product:0x00007facf60cac10>
    test/controllers/api/v1/orders_controller_test.rb:45:in `block in <class:OrdersControllerTest>'

I changed @order = products(:one) to @order = orders(:one) and it all worked again. This PR is the fix.

[madeindjs]

You're right! This seems to be a mistake. Thank you very much to correct it, I will also update project example.