Free Salesforce Salesforce Certified Platform Developer II (Plat-Dev-301) Exam Dumps - Page 2

To make the component perform faster, the developer should change the default for showContactInfo to false. The showContactInfo attribute is used to control whether the contactInfo component is rendered or not. By default, it is set to true, which means that the contactInfo component is always rendered, even if the user does not need to see it. This can slow down the component loading, as the contactInfo component may have some complex logic or data fetching in its controller or helper. By changing the default for showContactInfo to false, the developer can improve the component performance, as the contactInfo component will only be rendered when the user clicks on the Show Contact Info button, which triggers the toggleContactInfo function and sets the showContactInfo attribute to true. Changing the type of contactInfo to ''Map'' would not make the component perform faster, as contactInfo is not a variable, but a component name. A Map is a collection type that stores key-value pairs, and it is not related to the component rendering. Moving the contents of <c:contactInfo> into the component would not make the component perform faster, as it would not change the logic or data fetching of the contactInfo component. It would only make the component code less modular and reusable. Adding a change event handler for showContactInfo would not make the component perform faster, as it would not change the rendering of the contactInfo component. It would only add an extra function that is executed whenever the showContactInfo attribute changes, which may not be necessary for the component functionality.Reference: [Create and Use Attributes], [Render Components Conditionally]

The developer should implement the render attribute on theapex:commandButtontag to ensure that a partial refresh is made so that only the section identified with opportunity List is re-drawn on the screen. The render attribute specifies the ID of one or more components that are redrawn when the result of an AJAX update request returns to the client. The developer can use the render attribute to limit the scope of the refresh to theapex:pageBlockcomponent that contains the data table, and avoid refreshing the entire page. Enclosing the data table within theapex:actionRegiontag will not help, as theapex:actionRegiontag defines a section of a page that demarcates a form within a form, and allows the developer to limit the processing of form elements to the contents of the region. However, it does not affect the refresh of the page or the components. Ensuring the action method search returns null will not help, as it will only prevent the page from reloading, but it will not refresh the data table with the new search results. Implementing theapex:actionFunctiontag with immediate = true will not help, as theapex:actionFunctiontag defines a JavaScript function that can invoke a controller action method, and the immediate attribute specifies whether the action method is executed immediately, without processing any validation rules. However, it does not affect the refresh of the page or the components.Reference: [apex:commandButton], [apex:actionRegion], [apex:actionFunction], [Visualforce Developer Guide]

The two changes that the developer should make in this trigger to adhere to best practices are to move the Region__c query to outside the loop and to remove the last line updating accountList as it is not needed. Moving the Region__c query to outside the loop avoids the SOQL query limit, as it reduces the number of queries from one per Account record to one for all Account records. The developer can use a Map to store the Region__c records by Name, and then use the Map to assign the OwnerId for each Account record. Removing the last line updating accountList as it is not needed avoids the DML statement limit, as it is redundant to update the records that are already in the trigger context. The developer can use the Trigger.new list to modify the Account records, and the changes will be saved automatically after the trigger execution. Using a Map to cache the results of the Region__c query by Id is not a valid answer, as it does not move the query outside the loop, and it does not match the Name field of the Account record. Using a Map accountMap instead of List accountList is not a valid answer, as it does not affect the query or the DML limits, and it does not change the logic of the trigger.Reference: [Apex Triggers], [Apex Best Practices], [Apex Developer Guide]

The code snippet that should be added to the setup for the unit test to create the controller extension for the test is option A. This code snippet creates a PageReference object that points to the Visualforce page that uses the controller extension. Then, it sets the current page reference to the PageReference object and passes the Account ID as a URL parameter. Finally, it creates an instance of the controller extension by passing the standard controller as an argument. The code snippet in option B will not work because it does not set the current page reference or pass the Account ID as a URL parameter. The code snippet in option C will not work because it does not create a PageReference object or set the current page reference.Reference: [Testing Custom Controllers and Controller Extensions], [PageReference Class], [ApexPages Class]

The true statement regarding savepoints is that static variables are not reverted during a rollback. Savepoints are used to mark a point in the transaction that can be rolled back to if an error occurs. However, static variables are not affected by the rollback, as they retain their values throughout the transaction. The other statements are false, as savepoints must be rolled back in the reverse order of their creation, savepoints cannot cross trigger invocations, and savepoints are counted as DML statements and are subject to the governor limits.Reference: [Savepoints and Rollbacks], [Apex Developer Guide]

Implementing the setFixedSearchResult= method in the test class is a way to ensure that the test class runs successfully. The setFixedSearchResult= method is a method that can be used to specify the records to be returned by the SOSL query in the test class. The setFixedSearchResult= method can accept a list of record IDs as a parameter, and return those records when the SOSL query is executed. By using the setFixedSearchResult= method, the developer can control the data returned by the SOSL query, and avoid the dependency on the data in the org. The developer can also use the Test.loadData method to load the test data from a static resource, and pass the record IDs to the setFixedSearchResult= method. For example, the developer can use the following code to implement the setFixedSearchResult= method in the test class:

// Load test data from a static resource List<sObject> testRecords = Test.loadData(Account.sObjectType, 'testData');

// Get the record IDs List<Id> recordIds = new List<Id>(); for (sObject record : testRecords) { recordIds.add(record.Id); }

// Set the fixed search result Test.setFixedSearchResults(recordIds);

// Call the method that performs the SOSL query List<Account> results = searchFeatures.search('Acme');

// Assert the expected results System.assertEquals(testRecords.size(), results.size());

The best way to accomplish this requirement is to use a Lightning component to query and display interactions based on record type that is passed in using a design:attribute from the Lightning page. A Lightning component is a reusable unit of an app that can include markup, JavaScript, CSS, and Apex. A Lightning component can use the Lightning Data Service or Apex to query data from Salesforce and display it on a Lightning page. A design:attribute is a way to define attributes for a Lightning component that can be set in Lightning App Builder or Experience Builder. By using a Lightning component, the developer can create a custom UI element that can query and display the recent interactions for the customer based on the record type that is passed in as a design:attribute from the Lightning page. This way, the developer can leverage the Lightning framework and the Lightning Data Service or Apex to create a dynamic and interactive component that meets the requirement.Reference: [Lightning Components Basics], [Lightning Data Service Basics], [Design Attributes in Aura Components], [Design Attributes in Lightning Web Components]

The Cacheable=true attribute is used to indicate that the Apex method can be cached and reused on the client side, such as in a Lightning web component. This attribute enables the method to be called imperatively or via @wire in the component, and improves the performance and user experience of the component. Without this attribute, the Apex method can only be called imperatively, and will not work with @wire, which is used to get data from the server and update the component automatically. This can cause an error when the component is rendered, such as ''Error retrieving data''.Reference: [Call Apex Methods], [Imperative Apex]

To address the issue of slow unit tests in a test class with many methods that create many records for prerequisite reference data, a developer should move the prerequisite reference data setup to a @testSetup method in the test class. A @testSetup method is a special method that runs once before all test methods in a test class and creates common test data for all test methods. This can improve the performance of the test class by reducing the number of DML operations and avoiding code repetition. The test methods can access the test data created by the @testSetup method by using SOQL queries or the Test.loadData() method.Reference: [@testSetup Annotation], [Create Test Data for Apex Tests], [Test.loadData Method]