The implementation file of the AddProductController class (AddProductController.m) is modified to save the information of the product sold to the selected customer. Not only will the implementation file save the information of the product sold but, will also update the stock; the quantity of the product sold will be reduced from the inventory, that is, from the stock maintained in the MasterProduct entity. For example, if the initial quantity of Milk is 100 bottles (in the MasterProduct entity) and three bottles are sold to the customer, the quantity of the product left in the MasterProduct entity will be 97 bottles. Only the statements that are highlighted are added to the file and rest of the code is same as we saw in Chapter 8, Entering, Saving, Listing, and Deleting the Records of the Products Sold to the Customers:
// AddProductController.m // prob #import "AddProductController.h" @implementation AddProductController @synthesize newitemname, newquantity, newprice...
