when writing Trigger Handler Classes and calling the respective methods from a Master Trigger there are different ways to achieve this. The keywords are Static and Non-Static .
In other words:
public void
vs.
public static void
I was wondering what's the best practice to write and call a method from a Master Trigger. In fact both options will work - but I once read that going for non-static was always the better choice. Why is that?
Given we have a method in our class that creates Assets from an Opportunity's line items (Opportunity Products).
I'm new to APEX and curious about converting Apex Triggers to Apex Classes in order to be in line with the One-Trigger-per-Object pattern.
Let's say I have the following, very simple Trigger: Whenever an Account gets updated, the number of related contacts gets populated in the custom field Number_of_Contacts__c. The Trigger code looks like this:
trigger relatedContacts on Account (before update) {
List<Contact> relatedContacts = [SELECT Id
FROM Contact
WHERE AccountId IN :Trigger.new];
for (Account a : Trigger.new) {
a.Number_of_Contacts__c = relatedContacts.size();
}
}
First question: How would the Apex Class for this Trigger look like?
Second question: How shall I reference the Apex Class in the Master Trigger for the Account object? At least I already know where to put it:
trigger MasterOpportunityTrigger on Opportunity (
before insert, after insert,
before update, after update,
before delete, after delete) {
if (Trigger.isBefore) {
if (Trigger.isInsert) {
}
if (Trigger.isUpdate) {
// MY TRIGGER WILL GO HERE ;)
}
if (Trigger.isDelete) {
}
}
if (Trigger.isAfter) {
if (Trigger.isInsert) {
}
if (Trigger.isUpdate) {
}
if (Trigger.isDelete) {
}
}
}
I would highly appreciate if someone could teach me this best practice!
the System.FinalException: Record is read-only error is a well known error when talking about After Insert Triggers. I was wondering what's the most common workaround to resolve it.
Example scenario:
Let's say we want to write an After Insert Trigger that...
1) ... sets a field value in a newly created Lead record 2) ... creates a related record (e.g. Task) and therefore requires the Record Id of the new Lead (this part of the logic actually forces us to go for an After Trigger).
This code apparently will give us the notorious error message:
trigger leadTestTrigger on Lead (after insert) {
for (Lead myLead : Trigger.new) {
// We're inserting a value into a field of the initial record
myLead.AnyField = 'Any Value';
// Create a task related to the Lead
Task myTask = new Task();
myTask.Subject = 'Anything';
myTask.WhoId = myLead.Id;
myTask.Priority = 'Normal';
myTask.Status = 'Not Started';
insert myTask;
}
}
What's the most used technique to get out of this dilemma? How should the above code be amended?
Account[] oldAccounts = [SELECT Id, Description FROM Account ORDER BY CreatedDate ASC LIMIT 5];
I'm talking about the Account[] part of the code. Can someone explain to me what makes the [] type different from the List type? How does it behave and what are the particular use cases? When to use Account[] and when to use List<Account>?
I guess one could have also go for this option:
List<Account> oldAccounts = [SELECT Id, Description FROM Account ORDER BY CreatedDate ASC LIMIT 5];
when writing Trigger Handler Classes and calling the respective methods from a Master Trigger there are different ways to achieve this. The keywords are Static and Non-Static .
In other words:
public void
vs.
public static void
I was wondering what's the best practice to write and call a method from a Master Trigger. In fact both options will work - but I once read that going for non-static was always the better choice. Why is that?
Given we have a method in our class that creates Assets from an Opportunity's line items (Opportunity Products).
I'm new to APEX and curious about converting Apex Triggers to Apex Classes in order to be in line with the One-Trigger-per-Object pattern.
Let's say I have the following, very simple Trigger: Whenever an Account gets updated, the number of related contacts gets populated in the custom field Number_of_Contacts__c. The Trigger code looks like this:
trigger relatedContacts on Account (before update) {
List<Contact> relatedContacts = [SELECT Id
FROM Contact
WHERE AccountId IN :Trigger.new];
for (Account a : Trigger.new) {
a.Number_of_Contacts__c = relatedContacts.size();
}
}
First question: How would the Apex Class for this Trigger look like?
Second question: How shall I reference the Apex Class in the Master Trigger for the Account object? At least I already know where to put it:
trigger MasterOpportunityTrigger on Opportunity (
before insert, after insert,
before update, after update,
before delete, after delete) {
if (Trigger.isBefore) {
if (Trigger.isInsert) {
}
if (Trigger.isUpdate) {
// MY TRIGGER WILL GO HERE ;)
}
if (Trigger.isDelete) {
}
}
if (Trigger.isAfter) {
if (Trigger.isInsert) {
}
if (Trigger.isUpdate) {
}
if (Trigger.isDelete) {
}
}
}
I would highly appreciate if someone could teach me this best practice!
