In this chapter, we saw how a Product Entity is added to our existing Data Model. We saw different types of relationships and learned to establish relationship in both forward as well as backward directions between the Customer and the Product entities. We also saw the usage of Inverse relationship. We also saw different options of Delete Rules and how do they effect another managed object when one managed object is deleted. We also developed Data Model (classes) associated with both the entities. We also saw the role of the special methods that are auto generated for the relationship that we established from the Customer to the Product entity.

In this chapter, we also learnt how to enter and maintain the information of the product(s) sold to the selected customer. The task being a bit large, it was divided into three modules. We first developed a module that created a View to enter the information of the product(s) that is sold to the selected customer. Then, to allow the user to...