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Prepare for the Salesforce Prepare for your Platform Developer I Certification Exam exam with our extensive collection of questions and answers. These practice Q&A are updated according to the latest syllabus, providing you with the tools needed to review and test your knowledge.
QA4Exam focus on the latest syllabus and exam objectives, our practice Q&A are designed to help you identify key topics and solidify your understanding. By focusing on the core curriculum, These Questions & Answers helps you cover all the essential topics, ensuring you're well-prepared for every section of the exam. Each question comes with a detailed explanation, offering valuable insights and helping you to learn from your mistakes. Whether you're looking to assess your progress or dive deeper into complex topics, our updated Q&A will provide the support you need to confidently approach the Salesforce CRT-450 exam and achieve success.
The questions for CRT-450 were last updated on Jan 3, 2025.
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A custom object Trainer__c has a lookup field to another custom object Gym__c.
Which SOQL query will get the record for the Viridian City Gym and all it's trainers?
Which code statement includes an Apex method named updateAccounts in the class AccountController for use in a Lightning web component?
A developer identifies the following triggers on the Expense _c object:
The triggers process before delete, before insert, and before update events respectively.
Which two techniques should the developer implement to ensure trigger best practices are followed?
Choose 2 answers
A . Unify all three triggers in a single trigger on the Expense__c object that includes all events:
Salesforce best practices recommend having only one trigger per object to avoid redundancy and conflicts.
By combining all the events (before delete, before insert, and before update) into a single trigger, the developer can manage the logic in an organized and maintainable manner.
This also simplifies debugging and ensures that the trigger logic executes in a predictable order.
C . Create helper classes to execute the appropriate logic when a record is saved:
Using helper classes allows for a clean separation of concerns. The trigger becomes a dispatcher that delegates logic to dedicated classes.
For example, you can create methods like applyDefaultsToExpense(), validateExpenseUpdate(), and deleteExpense() in a helper class and invoke them from the trigger.
This improves reusability, readability, and testability of the code.
Why not the other options?
B . Unify the before insert and before update triggers and use Flow for the delete action:
While Flow is a powerful tool, it is not ideal for deleting records or replacing Apex trigger functionality, especially when triggers already exist for other events.
D . Maintain all three triggers on the Expense__c object but move the Apex logic out of the trigger definition:
Maintaining multiple triggers on the same object can lead to conflicts and execution order issues, even if the logic is moved to helper classes.
What is the value of the Trigger.old context variable in a before insert trigger?
Trigger.old in a before insert trigger:
The Trigger.old context variable contains the old version of the records being processed in the trigger.
In a before insert trigger, the records being processed are new and have no prior state in the database, so Trigger.old is null.
This behavior is specific to insert triggers because there is no 'old' record to reference before the record is created.
Why is it null?
The Trigger.old variable is only populated for triggers that handle updates or deletions (e.g., before update, after update, before delete, after delete). For insert operations, no previous state of the record exists.
Why not the other options?
A . An empty list of sObjects:
This is incorrect because Trigger.old is not initialized as an empty list for insert triggers---it is simply null.
B . Undefined:
Trigger.old is defined in the trigger context, but it is null for insert operations. Undefined is not a valid Apex state.
D . A list of newly created sObjects without IDs:
This describes Trigger.new in a before insert trigger, not Trigger.old. Trigger.new contains the new records being inserted.
Flow Builder uses an Apex action to provide additional information about multiple Contacts, stored in a custom class, ContactInfo. Which is the correct definition of the Apex method that gets the additional information?
A)
B)
C)
D)
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