Salesforce PDII - Salesforce Certified Platform Developer II (Plat-Dev-301)

The best practices for writing triggers in Salesforce include bulkifying your code to handle multiple records efficiently and reducing the number of SOQL queries, especially within loops, to avoid hitting governor limits.

Option B is correct because moving the SOQL query outside of the for loop is essential to bulkify the trigger. Performing a query within a loop can cause a SOQL governor limit to be reached if the trigger is processing many records. The best practice is to collect all necessary data before the loop starts and then process it within the loop.

Option C is correct as well, because using a Map to cache the results of a SOQL query by Id is another way to bulkify the code. This allows you to query all the necessary data once and then access it efficiently in memory, avoiding repeated queries.

Option A is incorrect because adding isExecuting before the update doesn't address any best practices related to bulkification or SOQL query optimization.

Option D is incorrect because the last line should not be removed if the developer intends to perform DML on the accountList. However, this line should be outside of the loop and is unnecessary if the trigger context is 'before insert' or 'before update', since in those contexts, changes to records in Trigger.new are implicitly saved without the need for explicit DML.

To determine which objects to include in the response, the developer should check the isCustom() value on the sObject describe result. This method returns a Boolean indicating whether the sObject is a custom object.

Jest tests are essential for developing Lightning Web Components (LWC) because they allow developers to ensure the quality and correctness of their components in isolation from the rest of the application. Reason A is incorrect because testing non-public properties breaks encapsulation and is considered bad practice. B is correct because Jest tests can simulate user interactions with the component, such as clicking buttons or entering text, to ensure it behaves as expected. C is correct as well because Jest tests can confirm that the component renders the expected DOM output, which is crucial for ensuring that the HTML structure of the component is accurate. D is not the best choice since Jest is more suited for testing components in isolation rather than how multiple components interact; integration tests are more appropriate for that. Lastly, E is correct because Jest tests can verify that events are fired at the appropriate times, which is a critical part of the component's interaction with the rest of the application.

References

Jest Testing: Lightning Web Components Testing

Jest Testing Best Practices: Lightning Web Components Jest Best Practices

A single trigger on Contact that handles both after update and before update events, utilizing helper classes for each logic set, is the most optimal implementation. It centralizes the logic for maintaining primary contacts and normalizing last names while allowing for clear separation of concerns through helper classes.

To automate the process based on the contact’s address information and prevent deletion from flagged regions:

Flow Builder: Can be used to set default information on records when they are created.

Apex Trigger: Allows for complex logic to be executed before or after data manipulation operations, including insert and delete. It can be used to enforce rules such as preventing deletion.

To ensure that the DOM is clean before each test runs, the developer should use the afterEach() method to reset it. This is part of the setup and teardown process in Jest tests, which helps to avoid state leakage between tests. References:

Jest Globals afterEach

The System.runAs() method is used in test classes to enforce record sharing. This method allows you to write test methods that change user contexts to ensure that the proper record sharing is enforced. References:

Understanding the runAs Method

For retrieving specific records using a known ID, the REST API is optimal due to its stateless, cacheable communications and lightweight structure. It's ideal for web applications that use JavaScript to make requests directly from the user’s browser. Using the REST API, the web page can make a simple HTTP GET request to the Salesforce REST service endpoint and retrieve the account information in a format that's easily handled by JavaScript (typically JSON).

JavaScript remoting in Visualforce allows for the execution of complex server-side application logic without the need to refresh the entire page, providing a more dynamic user experience. It supports more complex operations than Visualforce Remote Objects, which are intended for basic CRUD operations.