Valid CRT-450 Test Objectives | Exam CRT-450 Lab Questions

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Salesforce Certified Platform Developer I Sample Questions (Q125-Q130):

NEW QUESTION # 125
A developer has a Visualforce page and custom controller to save Account records. The developer wants to display any validation rule violations to the user.
How can the developer make sure that validation rule violations are displayed?

A. Use a try/catch with a custom exception class.
B. Add custom controller attributes to display the message.
C. Perform the DML using the patabase.upsert () method.
D. Include <apex:messages> on the Visualforce page.

Answer: D

Explanation:
When saving records using a custom controller in a Visualforce page, validation rule violations can occur. To display these validation error messages to the user, the developer should use the <apex:messages> component.
Option A: Include <apex:messages> on the Visualforce page.
Correct Approach.
The <apex:messages> component displays all messages that were generated for all components on the page, including validation rule violations.
When a DML operation is performed, any validation errors are automatically added to the ApexPages message collection.
Including <apex:messages> in the page ensures that these messages are displayed to the user.
Example:
<apex:page controller="CustomAccountController">
<apex:form>
<apex:messages />

<apex:commandButton action="{!saveAccount}" value="Save" />
</apex:form>
</apex:page>
While a try/catch block can catch exceptions, it is not required for displaying validation errors.
Validation rule violations are added to the message collection automatically.
Using try/catch may suppress the standard error handling.
Option C: Add custom controller attributes to display the message.
Inefficient Approach.
Manually adding controller attributes and logic to handle error messages adds unnecessary complexity.
The standard <apex:messages> component handles this automatically.
Option D: Perform the DML using the Database.upsert() method.
Not Sufficient Alone.
Using Database.upsert() allows for finer control over DML operations and error handling.
However, unless the errors are added to the message collection, they will not be displayed.
The developer would still need to handle displaying the errors.
Conclusion:
By including the <apex:messages> component on the Visualforce page, validation rule violations and other error messages are displayed to the user automatically.
Therefore, Option A is the correct answer.
Reference:
apex
https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_compref_messages.htm Displaying Errors Option B: Use a try/catch with a custom exception class.
Not Necessary.

NEW QUESTION # 126
A custom Visualforce controller calls the apexPages.addMessage () method, but no messages are rendering on the page.
Which component should be added to the Visualforce page to display the message?

A. <apex:pageMessage severity="info" />
B. <apex:pageMessages />
C. <apax:message for="info"/>
D. <apex:facet namew="mes=ages" />

Answer: B

Explanation:
Option A: <apex:pageMessages />
Correct Answer.
The <apex:pageMessages /> component displays all messages that were added to the ApexPages message list, including those added via ApexPages.addMessage().
<apex:facet> is used within certain components to define content for a specific region, not for displaying page messages.
Option C: <apex:message for="info"/>
Incorrect.
<apex:message> displays a message for a specific component with validation errors, not general messages added via ApexPages.addMessage().
Option D: <apex:pageMessage severity="info" />
Incorrect.
<apex:pageMessage> is used to display a single message, typically hardcoded in the Visualforce page.
Conclusion:
To display messages added by ApexPages.addMessage(), the page should include <apex:pageMessages />, which is Option A.
Reference:
apex
https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_compref_pageMessages.htm Option B: <apex:facet name="messages" /> Incorrect.

NEW QUESTION # 127
A developer is creating an app that contains multiple Lightning web components.
One of the child components is used for navigation purposes. When a user clicks a button called Next in the child component, the parent component must be alerted so it can navigate to the next page.
How should this be accomplished?

A. Update a property on the parent.
B. Fire a notification.
C. Call a method in the Apex controller.
D. Create a custom event,

Answer: D

Explanation:
To notify the parent component from a child component when a button is clicked:
Option C: Create a custom event
Child Component:
// ChildComponent.js
handleClick() {
const nextEvent = new CustomEvent('next');
this.dispatchEvent(nextEvent);
}
Parent Component:

<c-child-component onnext={handleNext}></c-child-component>
javascript
Copy code
// ParentComponent.js
handleNext() {
// Navigate to the next page
}
Reference:
"To communicate up the component containment hierarchy, fire a custom event in the child component."
- Lightning Web Components Developer Guide: Communicate with Events
Why Other Options Are Incorrect:
Option A: Updating a property on the parent directly is not possible from the child.
Option B: "Fire a notification" is vague and not a standard mechanism.
Option D: Calling a method in the Apex controller does not facilitate child-to-parent communication within components.

NEW QUESTION # 128
A developer created a trigger on the Account object. While testing the trigger, the developer sees the error message 'Maximum trigger depth exceeded'.
What could be the possible causes?

A. The trigger is getting executed multiple times.
B. The trigger does not have sufficient code coverage.
C. The developer does not have the correct user permission.
D. The trigger is too long and should be refactored into a helper class.

Answer: A

NEW QUESTION # 129
A developer must write an Apex method that will be called from a Lightning component. The method may delete an Account stored in the accountRec variable.
Which method should a developer use to ensure only users that should be able to delete Accounts can successfully perform deletions?

A. accountRec, isDeletable()
B. Account,isDeleteable
C. Schema,sObjectType,Account, isDeletable ()
D. accuntRec, sObjectType,isDeletable()

Answer: C

NEW QUESTION # 130
......

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VALID CRT-450 TEST OBJECTIVES | EXAM CRT-450 LAB QUESTIONS

Valid CRT-450 Test Objectives | Exam CRT-450 Lab Questions