Most Recent Salesforce DEX-450 Exam Questions & Answers

When a Lightning component needs to execute a complex SOQL query that joins two objects, and such queries are not supported directly in Lightning components, the solution is to use an Apex controller method.

Option C: Invoke an Apex class with the method annotated as @AuraEnabled to perform the query.

Correct Approach.

The Lightning component can call an Apex method annotated with @AuraEnabled.

The Apex method can perform the complex SOQL query and return the results to the component.

While it's possible to invoke flows from Lightning components, flows are not ideal for executing complex SOQL queries.

Flows have limitations on data manipulation and querying.

Option B: Write the query in a custom Lightning web component wrapper and invoke from the Lightning component.

Not Applicable.

Lightning components (Aura or LWC) cannot execute complex SOQL queries directly.

They must call server-side Apex methods for such operations.

Option D: Use the Salesforce Streaming API to perform the SOQL query.

Incorrect.

The Streaming API is used for subscribing to data changes in real-time.

It is not used for executing queries.

Conclusion:

The Lightning component should invoke an Apex method annotated with @AuraEnabled to perform the complex SOQL query, which is Option C.

Lightning Components and Apex

Using Apex to Get Data

Incorrect Options:

Option A: Create a flow to execute the query and invoke from the Lightning component.

Not Optimal.

To script the deployment and unit test execution as part of continuous integration (CI), developers use tools that can be automated and run from the command line or scripts.

Option D: Salesforce CLI

Correct.

The Salesforce CLI (Command-Line Interface) is a powerful command-line tool that allows developers to interact with Salesforce orgs.

It supports scripting of deployments using commands like sfdx force:source:deploy and running unit tests using sfdx force:apex:test:run.

The CLI can be integrated into CI/CD pipelines to automate deployments and testing.

While Visual Studio Code is a powerful IDE for Salesforce development, it is primarily used for interactive development.

It is not a scripting tool and is not suitable for automation in CI/CD pipelines.

The Developer Console is a web-based tool within Salesforce for interactive development and debugging.

It cannot be used for scripting or automation as part of CI/CD processes.

Execute Anonymous is used to run Apex code snippets in an ad-hoc manner.

It is not suitable for scripting deployments or unit test execution in CI/CD.

Salesforce CLI Command Reference

Incorrect Options:

Option A: VS Code

Incorrect.

Salesforce Extensions for VS Code

Option B: Developer Console

Incorrect.

Developer Console Overview

Option C: Execute Anonymous

Incorrect.

Executing Anonymous Apex Code

Conclusion:

The correct tool for scripting deployment and unit test execution in CI/CD is Salesforce CLI.

To integrate Order__c records with the ERP system after their status is set to 'Placed', and considering that orders may be uploaded in bulk, the developer should:

Option D: Callout from a Queueable class called from a trigger

Trigger: Implement an after-update trigger on Order__c to detect when the status changes to 'Placed'.

Queueable Apex: Use Queueable Apex to handle asynchronous processing and callouts. Queueable classes support callouts by implementing the Database.AllowsCallouts interface.

Benefits:

Handles Bulk Data: Queueable Apex can process records in batches and can be chained for processing large volumes.

Supports Callouts: Unlike future methods, Queueable Apex allows for more complex data types and supports callouts with fewer limitations.

'To make a Web service callout to an external service or API, you must use asynchronous Apex, such as future methods, Queueable Apex, or batch Apex.'

'Queueable Apex is an asynchronous Apex feature that is a superset of future methods with some extra features.' --- Apex Developer Guide: Queueable Apex

Why Other Options Are Incorrect:

Option A: Callout from an @future method called from a trigger

@future methods have limitations, such as accepting only primitive types as parameters and a limit of 50 calls per transaction, which can be exceeded when processing thousands of records.

'Methods with the future annotation must be static methods and can only return a void type. The specified parameters must be primitive data types, arrays of primitive data types, or collections of primitive data types.' --- Apex Developer Guide: Future Methods

Option B: Callout from a Batchable class called from a scheduled job

Batch Apex is not immediately triggered by record changes and may not meet the requirement of processing the order after the status changes.

Scheduling adds delay and complexity unnecessary for this use case.

Option C: Flow with a callout from an invocable method

Flows invoked from triggers (record-triggered flows) cannot perform callouts unless they are configured to run asynchronously, and managing bulk operations with flows can be less efficient.