Apex Trigger, change Account Owner to Event Owner - salesforce

Question

I'm a newbie and I'd like to ask you a little help for what follows:
I create a new Event on an Account owned by User X and I assign this event to User Y.
Then, I'd like to have a trigger that changes the ownership of the Account to user Y (previously owned by User X).
How can I do it?
Thanks a lot

Answer 1

This can be solved just changing some fields on the account every time it a new event is created on this account.
You would need a trigger on Event:
trigger EventTrigger on Event (after insert){
EventTriggerHandler.changeAccountOwner(Trigger.New);
}
then on the EventTriggerHandler class you would have this:
public static class EventTriggerHandler{
public void changeAccountOwner(Event triggerNew){
//we are cheching the prefix of the field on the event that tells you where it was created
String idPrefix = String.valueOf(triggerNew.WhatId).subString(0,2);
if(idPrefix == '001'){ // this is because the event may be created sometwhere else and not always in an account
Account a = [SELECT Id, OwnerId FROM Account WHERE Id = :triggerNew.WhatId];
//we just place the owner of the event to be the owner of the account
a.OwnerId = triggerNew.OwnerId;
update a;
}
}
}