Salesforce Platform Developer I Certification Guide

Working of a controller extension

Let's create a page of a movie with the complete cast on one page. Based on the movie, we will select the cast of the movie and display this cast. We will start with the extension of the controller. We need a class that transfers the details of our movie to a class via the standard controller.

Open your Developer Console and create a new class with the following code:

public with sharing class MovieExtension {     private final Id movieId;     public Movie__c theMovie {     get{     if (this.movieId != null){     // select the movie and the cast from the Id.     // We select records always with a list, even if you know it should be a record. // if someone removes the record while you want to select it, you will receive an exception ...