Book Image

Core Data iOS Essentials

By : Bintu Harwani, B. M. Harwani
Book Image

Core Data iOS Essentials

By: Bintu Harwani, B. M. Harwani

Overview of this book

Core Data is the essential ingredient in data driven iOS apps. It's used for storing, retrieving, and manipulating application data in databases, XML, and binary formats. It's an essential component for iPhone, iPod Touch, and iPad apps.Core Data Essentials provides a clear, readable guide to the most useful aspects of Core Data. Built around a realistic example app, the book showcases the most important aspects of Core Data development in the context of a complete, functioning app written in Objective C.The book starts with a tour of how the app works. Then you'll see how to easily display data using the Table View. You'll learn how to develop an appropriate data model that fits the needs of your app, then implement that model as updatable data objects. You'll see how to update data and build relationships between objects and learn how Core Data can work with search, and how to provide your users with friendly data editing features.
Table of Contents (19 chapters)
Core Data iOS Essentials
About the Author
About the Reviewers

Adding the product entity to the Data Model

To store the information of different products sold to the customers, we have to add an entity with the name: Product to our application. Also, we need to define a relationship between the Customer and the Product entity. As a customer can purchase several products, there will be a one to many relationship between the Customer and the Product entity. Let us double-click the prob.xcdatamodel file from the Resources group to open the Xcode's data modeling tool. We find a Customer's entity (as shown in the following screenshot) already there that we created in Chapter 4, Designing Data Model and Building Data Objects for Customers.

We can see that the Customer entity contains three attributes of the String data type: name, emailid, and contactno that will be used for storing the customer's information. To add the Product entity to our data model follow the given steps:

  1. 1. Select the + (plus) button at the bottom of the Entity pane or choose Design ...