CRT-450 Exam Dumps - Salesforce Developers Questions and Answers

The Lightning Component framework is used to develop:

Option B: Lightning Pages

Explanation: Lightning Components can be used to build custom components that can be added to Lightning Pages, enhancing the Lightning Experience and Salesforce mobile app.

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.

Explanation:

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.

Universal Containers wants to prevent Opportunities from being edited once they reach the Closed/Won stage. To achieve this, the developer can use the following strategies:

Option A: Use a validation rule.

Correct Approach.

Explanation:

A validation rule can be created on the Opportunity object to prevent users from editing records when the Stage is Closed/Won.

The validation rule would evaluate whether the record's StageName is 'Closed Won' and, if so, display an error message when a user attempts to edit and save the record.

Example Validation Rule:

AND(

ISPICKVAL(StageName, 'Closed Won'),

ISCHANGED(ANYFIELD) // Replace ANYFIELD with specific fields if needed

)

Benefits:

Declarative Solution: No code required.

Consistent Enforcement: Applies across all user interfaces and API.

To notify the parent component from a child component when a button is clicked:

Option C: Create a custom event

Explanation: In Lightning Web Components, child components communicate with parent components by dispatching custom events.

Child Component:

// ChildComponent.js

handleClick() {

const nextEvent = new CustomEvent('next');

this.dispatchEvent(nextEvent);

}

Parent Component:

javascript

Copy code

// ParentComponent.js

handleNext() {

// Navigate to the next page

}

The requirement is for service agents to gather many pieces of information when processing damaged or stolen credit cards.

Option A: Screen-based Flow

Correct Answer.

Explanation:

A Screen Flow allows developers to build guided, interactive forms that collect information from users.

Flows can have multiple screens, validation rules, and branching logic.

They can be created declaratively without code, making them efficient to implement.

Benefits:

Efficient Development: No need for code.

User-Friendly: Provides a step-by-step interface.

Maintainable: Easy to update as requirements change.

Requirements:

The maxAttempts variable must:

Preserve its value for the length of the Apex transaction.

Be able to share the variable's state between trigger executions.

Solution:

To meet these requirements, the variable should be declared as a private static variable on a helper class.

Option D: Declare maxAttempts as a private static variable on a helper class.

Correct Approach.

Explanation:

Static Variables:

Static variables retain their value throughout the execution context of the Apex transaction.

They are shared across trigger contexts and can be used to maintain state between trigger executions.

Private Modifier:

Keeps the variable encapsulated within the class.

Helper Class:

Placing the variable in a helper class allows it to be accessed from multiple triggers or classes within the transaction.

Sample Code:

public class MyHelperClass {

private static Integer maxAttempts = 0;

public static void incrementAttempts() {

maxAttempts++;

}

public static Integer getMaxAttempts() {

return maxAttempts;

}

}

Benefits:

State Preservation: Static variables maintain their state during the transaction.

Accessibility: Can be accessed from different triggers or classes.

Understanding the Code:

for (Integer i = 0 ; i < 500; i++) {

Account a = new Account (Name='New Account ' + i);

insert a;

}

What the Code Does:

Loops from i = 0 to i = 499 (total of 500 iterations).

In each iteration:

Creates a new Account record with the name 'New Account ' + i.

Performs an insert DML operation for each account.

Salesforce Governor Limits:

DML Statements Limit:

Maximum of 150 DML statements per Apex transaction.

Since users can see Accounts they do not own in a private sharing model, the custom Apex code is likely not enforcing sharing rules. To enforce sharing permissions, the developer should use the with sharing keyword on the class declaration.

with sharing Keyword: This enforces the sharing rules of the current user, ensuring that the Apex class respects the user's record-level access permissions.

"Use the with sharing keyword when declaring a class to enforce the sharing rules that apply to the current user."— Apex Developer Guide: Using the with sharing or without sharing Keywords

Private Sharing Model: In a private sharing model, users should only see records they own or have been shared with them.

"Private: Only the record owner and users above that role in the hierarchy can view, edit, and report on those records."— Salesforce Help: Organization-Wide Sharing Defaults

Why Not Other Options:

A. Use the schema describe calls to determine if the logged-in user has access to the Account object: Schema describe calls check for object-level access, not record-level sharing.

"Schema describe information provides metadata about object and field properties, but it doesn't enforce record-level access."— Apex Developer Guide: Schema Namespace

C. Use the without sharing keyword on the class declaration: This runs the class in system context, ignoring sharing rules, which is the opposite of what's needed.

"Classes declared as without sharing or those that do not specify a keyword default to without sharing and don't enforce the sharing rules of the current user."— Apex Developer Guide: Using the with sharing or without sharing Keywords

D. Use the UserInfo Apex class to filter all SOQL queries to return records owned by the logged-in user: Manually filtering queries is error-prone and not a best practice when with sharing can enforce sharing automatically.

"Avoid hardcoding user or profile IDs and using the UserInfo class to enforce security. Instead, use declarative security features."— Apex Developer Guide: Enforcing Security in Apex

Conclusion: By declaring the class with with sharing, the Apex code respects the user's sharing rules, ensuring that users only see Accounts they have access to.

Option A: Specifying loading order

True.

Explanation:

The tag allows you to specify the order in which scripts are loaded by the sequence in the scripts attribute.