Quiz Answers – Chapter 6

Preface: this post is part of the Advanced Apex Concepts series.
View Chapter 6 quiz questions without the answers!

Chapter 6 Questions:

1. You need to write a trigger that references formula fields on an object. These formula fields often change when a record is created/edited and saved. Should you use a before or after trigger?

2. You’re writing a trigger on Opportunities that reassigns the owner of newly created opps. Should you use a before or after trigger?

3. You need to write a trigger that automatically creates Contact Roles for every newly created Opportunity. Should you use a before or after trigger?

4. True or false. Every trigger you write should have at least one System.debug statement.

5. Is it better to have too many System.debug statements or too few?

6. True or false. You can see the output of System.debug in both Sandbox and Production orgs.

7. Which happens when you use Trigger.oldMap in an insert trigger?
  a. The value returned is always null
  b. You receive an error

8. You’re creating a trigger that reduces the inventory of a Stock object every time a Product is purchased. Why is it or is it not necessary to use Trigger.oldMap?

9. An email you’re writing needs to include multiple different variables depending on the associated Contact. Create a “body” variable for an email message that will say this for every contact in your trigger (things inside <<this>> are fields):
Dear <<Contact’s First Name>>,

Every day I get lost in your <<Contact’s eye color>> eyes. Your <<Contact’s hair color>> hair smells like <<Roses, if the “Likes Roses” field is checked. Otherwise, Dandelions>>. I want to buy you <<Contact’s favorite ice cream flavor>> ice cream that is organic. I will pick you up after you’re off work at <<Contact’s Account name>>. I will not take no for an answer.

Love,
<<Your first name>>

10. Your manager would like to edit some of your trigger’s variables without having to write new code. You have the option of saving these variables either in a Custom Setting or in a custom object. What are the advantages and disadvantages of each option?

Chapter 6 Practice Trigger:
Write a trigger that:
– Sends a “Farewell” email to Leads
– Only sends this email when the Lead’s “Rating” changes to “Cold”
– Can be turned on and off without writing any code
– Has at least five System.debug statements
– Don’t forget the test class!

trigger Farewell on Lead (before insert, before update) {
  // Grab your Custom Setting values
  Bye_Settings__c settings = Bye_Settings__c.getInstance('bye');
  Boolean triggerIsOff     = settings.Turn_Off_Trigger__c;
  
  // Make sure trigger is on
  if (!triggerIsOff) {
    System.debug('Farewell trigger is on!');
    
    // Create master email list
    List<Messaging.SingleEmailMessage> mails = 
    new List<Messaging.SingleEmailMessage>();
    
    // Loop through all leads in trigger
    for (Lead myLead : Trigger.new) {
      if (myLead.Email != null) {
        if (myLead.Rating == 'Cold') {

          Boolean sendEmail = false;

          // Inserted leads have no "old" value
          if (Trigger.isInsert) {
            sendEmail = true;
            System.debug(myLead.Email + ' is new and cold.');
          // Check that updated leads were changed to 'Cold'
          } else {
            if (Trigger.oldMap.get(myLead.Id).Rating != 'Cold') {
              sendEmail = true;
              System.debug(myLead.Email + ' is now cold.');
            }
          }
    
          // Create the email
          if (sendEmail) {
            System.debug('Creating email for ' + myLead.Email);
            Messaging.SingleEmailMessage mail = 
            new Messaging.SingleEmailMessage();
            List<String> sendTo = new List<String>();
            sendTo.add(myLead.Email);
            mail.setToAddresses(sendTo);
            mail.setReplyTo(UserInfo.getUserEmail());
            mail.setSenderDisplayName(UserInfo.getName());
            mail.setSubject('Farewell, my love.');
            String body = 'Life is too short.';
            mail.setHtmlBody(body);
            mails.add(mail);
          }
        }
      }
    }
    Messaging.sendEmail(mails);
    System.debug(mails.size() + ' emails sent!');
  } else {
    System.debug('Farewell trigger is off.');
  }
}

@isTest
public class TestFarewell {
  static testMethod void testFarewell() {
    // Create custom settings
    Bye_Settings__c settings     = new Bye_Settings__c();
    settings.Name                = 'bye';
    settings.Turn_Off_Trigger__c = false;
    insert settings;
    
    // Create a cold lead
    Lead lead = new Lead();
    lead.Company  = 'McIlhenny';
    lead.LastName = 'Tabasco';
    lead.Email    = 'moretabasco@gmail.com';
    lead.Rating   = 'Cold';
    insert lead;
    
    // Make lead hot!
    lead.Rating = 'Hot';
    update lead;
    
    // Make lead cold again to send email!
    lead.Rating = 'Cold';
    update lead;

    // We'd test with more records, but
    // Developer orgs have low email limits
    
    // We can't assert that leads received emails!
    // We can test a lot more, but this is fine

  }
}