Master the Salesforce Certified Platform Developer I (WI24) CRT-450 Exam with Confidence!

• By providing device-awareness for mobile and desktops. This is true because the Lightning Component framework is a UI framework for developing Lightning components for mobile and desktop devices. Lightning web components and Aura components can coexist and interoperate on a page. The framework takes care of rendering the components appropriately for different devices and screen sizes1.
• By providing an Agile process with default steps. This is false because the Lightning Component framework does not provide any specific process or methodology for developing solutions. Developers can use any process that suits their needs, such as Agile, Waterfall, or Scrum2.
• By providing code review standards and processes. This is false because the Lightning Component framework does not provide any code review standards or processes. Developers are responsible for ensuring the quality and maintainability of their code, and they can use tools such as code analysis, testing, and debugging to help them3.
• By providing change history and version control. This is false because the Lightning Component framework does not provide any change history or version control features. Developers can use tools such as Git, SVN, or Salesforce DX to manage their source code and track changes.

References:

• 1: Introducing Aura Components
• 2: Agile Development with Salesforce
• 3: Code Quality and Code Analysis
• : Source Control and Salesforce Development

The developer should use an external ID field to ensure the data being integrated is matched to the right records in Salesforce. An external ID field is a custom field that has the External ID attribute, meaning that it contains unique record identifiers from a system outside of Salesforce. When you integrate with an external system, you can use an external ID field to match records based on the external system’s ID, rather than the Salesforce ID. This way, you can avoid creating duplicate records or updating the wrong records. An external ID field can also be used as a relationship field to relate records to other objects. A lookup field is a relationship field that allows users to select a record from another object. A formula field is a read-only field that derives its value from a formula expression. An external object is a custom object that maps to data stored outside Salesforce, such as in an external database. These options are not relevant to matching records based on an external system’s ID. References:

• Salesforce Help: External ID Fields, page 1
• Trailhead: Platform Developer I Certification Study Guide: Data Modeling, unit 2

The correct definition of a Lightning Web Component property that uses the getAccounts method is option C. In Salesforce, the @wire decorator is used to read data from one of the wire adapters built into Lightning Web Components or create a JavaScript property in a Lightning web component. The property is then provisioned with data, error, or both. A provisioned property has a specific shape—data and error properties—designed for working with wire services.

In this case, @wire(getAccounts, { searchTern: '$searchTern' }) accountList; is the correct syntax where:

• getAccounts is the Apex method.
• { searchTern: '$searchTern' } are parameters passed to the Apex method.
• accountList is the JavaScript property that gets assigned the data returned by getAccounts.

References: Lightning Web Components Developer Guide

The developer should implement a callout from a queueable class called from a trigger to accomplish this. A callout is a request that is sent from Salesforce to an external service, such as a REST endpoint in the ERP system1. A queueable class is an Apex class that implements the Queueable interface and can be executed asynchronously by adding it to the Apex job queue2. A trigger is an Apex script that executes before or after specific data manipulation language (DML) events on a Salesforce object, such as insert, update, or delete3.

The reason why this option is the best is because:

• A callout from a future method called from a trigger (option A) is not recommended, because future methods have some limitations, such as not being able to pass sObjects as parameters, not being able to chain future calls, and not being able to monitor the status of the execution4.
• A callout from a schedulable class called from a scheduled job (option B) is not suitable, because scheduled jobs run at a specified time or interval, and not in response to a data change event, such as setting the order status to "Placed"5.
• A flow with a callout from an invocable method (option C) is not feasible, because flows cannot be triggered by data changes, but only by user actions, such as clicking a button, or by process automation tools, such as Process Builder or Workflow.

References:

• 1: Callouts | Apex Developer Guide | Salesforce Developers
• 2: Queueable Apex | Apex Developer Guide | Salesforce Developers
• 3: Triggers | Apex Developer Guide | Salesforce Developers
• 4: Using the Future Annotation | Apex Developer Guide | Salesforce Developers
• 5: Schedulable Interface | Apex Developer Guide | Salesforce Developers
• : [Flow Trigger Workflow Actions | Salesforce Help]

Cross site scripting (XSS) is a vulnerability that occurs when an attacker can insert unauthorized HTML or JavaScript code into a web page viewed by other users. This can lead to hijacking the user’s session, stealing confidential information, or defacing the page. To prevent XSS, the developer should always validate and encode any user-supplied data before displaying it on the page. The ApexPages.currentPage() .getParameters() .get(‘url_param’) method returns the value of the URL parameter as a string, but does not perform any validation or encoding. Therefore, it is vulnerable to XSS if the parameter contains malicious code. The ApexPages.currentPage() .getParameters() .get(‘url_param’) .escapeHtml4() method escapes the HTML characters in the parameter value, such as <, >, &, and ", but does not prevent JavaScript code from being executed. Therefore, it is also vulnerable to XSS if the parameter contains a script tag or an event handler attribute. The String.escapeSingleQuotes(ApexPages.currentPage() .getParameters(). get(‘url_param’)) method escapes the single quotes in the parameter value, but does not affect any other characters. Therefore, it is also vulnerable to XSS if the parameter contains any HTML or JavaScript code. The String.ValueOf(ApexPages.currentPage() .getParameters() .get(‘url_param’)) method converts the parameter value to a string and encodes any HTML characters as HTML entities, such as <, >, &, and ". This prevents any HTML or JavaScript code from being rendered or executed on the page. Therefore, it is the best option to prevent XSS. References: You can learn more about XSS and how to prevent it in Apex from the following sources:

• Cross Site Scripting (XSS) | Apex Developer Guide
• Secure Coding Cross Site Scripting | Secure Coding Guide
• Cross-Site Scripting in Apex | SecureFlag Security Knowledge Base

• The @testSetup annotation is a way to create test data for a test class. It allows you to define a method that runs once before any test methods in the class and inserts common test data into the test context12.
• The @testSetup annotation is not supported when the GisTest(SeeAllData=True) annotation is used. The GisTest(SeeAllData=True) annotation allows a test class or method to access all data in the organization, including pre-existing data that the test didn’t create. If this annotation is used, the test setup method is skipped and no test data is inserted12.
• Test data is inserted once for all test methods in a class when the @testSetup annotation is used. This means that the test data is shared across all test methods and only counts once towards the governor limits. This can improve the performance and efficiency of the test class12.
• A method defined with the @testSetup annotation does not execute once for each test method in the test class and does not count towards system limits. It only executes once before any test methods and only counts once towards the governor limits. However, any DML operations or queries performed in the individual test methods do count towards the system limits12.

References:

• 1: Using Test Setup Methods
• 2: Cert Prep: Platform Developer I: Testing and Debugging

A master-detail relationship is a parent-child relationship in which the master (parent) record controls certain behaviors of the detail (child) record, such as security, ownership, and deletion. A re-parentable master-detail relationship allows the detail record to be moved to a different master record, as long as the user has the appropriate permissions. This relationship implementation supports the requirements of calculating the total amount on an Order, calculating the line amount for each Line Item, and moving Line Items to a different Order. A lookup relationship is a looser association between two objects, in which the parent record does not control the behaviors of the child record. A re-parentable lookup relationship also allows the child record to be moved to a different parent record, but it does not support the automatic roll-up summary fields or cascade deletion that are needed for the requirements. Therefore, option A is the correct relationship implementation for the scenario. References: Relationships Among Objects | Salesforce Help, Cert Prep: Platform Developer I: Data Modeling

The Test class provides a method called getStandardPricebookId() that returns the ID of the standard price book in the organization1. This method allows access to the standard price book without using SeeAllData or loading a static resource. The other options are either invalid or unnecessary for this purpose. References:

• Test Class | Apex Reference Guide | Salesforce Developers

The correct answer is D because the Model-View-Controller (MVC) design framework is a best practice for developing scalable and maintainable applications on the Salesforce platform. The MVC framework separates the application logic into three layers: the model, which represents the data and business logic; the view, which displays the user interface and user interactions; and the controller, which mediates the communication between the model and the view. By using the MVC framework, developers can modularize their code, reuse components, and avoid tight coupling between layers. The other options are incorrect because they are not design frameworks, but rather development methodologies or architectures. Flux is an architecture for building user interfaces with React, a JavaScript library. Waterfall and Agile are methodologies for managing software development projects, with different approaches to planning, testing, and delivering software. References:

• Apex Developer Guide: MVC Architecture
• Trailhead: Apex Basics for .NET Developers
• Trailhead: Platform Developer I Certification Study Guide

The merge method is an Apex Data Manipulation Language (DML) operation that allows you to combine up to three records of the same sObject type into one of the records, known as the master record. The merge method deletes the other records, known as the victim records, and reparents any related records to the master record. The merge method has the following characteristics:

• Merge is supported with accounts, contacts, cases, and leads: The merge method can only be used with these four standard sObject types. You cannot use the merge method with custom objects or other standard objects.
• The merge method allows up to three records, including the master and two additional records with the same sObject type, to be merged into the master record: The merge method takes an array of sObject records as the input parameter, where the first record is the master record and the rest are the victim records. The merge method can merge up to three records of the same sObject type into the master record. If you want to merge more than three records, you need to call the merge method multiple times.

The other statements are not valid considerations when using the merge method:

• The field values on the master record are overwritten by the records being merged: This is not true. The field values on the master record are not overwritten by the victim records, unless you explicitly specify the field names and values in the master record before calling the merge method. By default, the merge method preserves the field values of the master record and discards the field values of the victim records.
• External ID fields can be used with the merge method: This is not true. The merge method does not support external ID fields as input parameters. You need to use the record IDs of the sObject records to perform the merge operation.

References: Merging Records, merge method, Prepare for Your Salesforce Platform Developer I Credential