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Salesforce Programmatic Development using Apex and Visualforce in Lightning Experience Sample Questions (Q157-Q162):

NEW QUESTION # 157
A developer must perform a complex SOQL query that joins two objects in a Lightning component.
How can the Lightning component execute the query?

A. Use the Salesforce Streaming API to perform the SOQL query.
B. Create a flow to execute the query and invoke from the Lightning component.
C. Invoke an Apex class with the method annotated as @AuraEnabled to perform the query.
D. Write the query in a custom Lightning web component wrapper and invoke from the Lightning component.

Answer: C

Explanation:
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.
Reference:
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.

NEW QUESTION # 158
A developer needs to create a baseline set of data (Accounts, Contacts, Products, Assets) for an entire suite of tests allowing them to test independent requirements various types of Salesforce Cases. Which approach can efficiently generate the required data for each unit test?

A. Add @IsTest(seeAllData=true) at the start of the unit test class
B. Create a mock using Stub API
C. Use @TestSetup with a void method
D. Create test data before test.startTest() in the test unit.

Answer: C

NEW QUESTION # 159
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. Create a custom event,
D. Call a method in the Apex controller.

Answer: C

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 # 160
A software company is using Salesforce to track the companies they sell their software to in the Account object. They also use Salesforce to track bugs in their software with a custom object, Bug__c.
As part of a process improvement initiative, they want to be able to report on which companies have reported which bugs. Each company should be able to report multiple bugs and bugs can also be reported by multiple companies.
What is needed to allow this reporting?

A. Lookup field on sug_c to Account
B. Roll-up summary field of Bug__c on Account
C. Master-detail field on Bug__c to Account
D. Junction object between Bug_c and Account

Answer: D

Explanation:
The requirement is to model a many-to-many relationship between Account and Bug__c:
Each Account (company) can report multiple bugs.
Each Bug__c can be reported by multiple accounts.
To represent a many-to-many relationship in Salesforce, we use a junction object.
Option A: Junction object between Bug__c and Account
Correct Answer.
Create a custom junction object, e.g., AccountBug__c, with two master-detail relationships:
One to Account.
One to Bug__c.
This allows linking accounts and bugs in a many-to-many fashion.
Enables reporting on which companies have reported which bugs.
This would create a one-to-many relationship (one account to many bugs), but a bug cannot be associated with multiple accounts.
Option C: Lookup field on Bug__c to Account
Incorrect.
Similar to Option B, it creates a one-to-many relationship.
Option D: Roll-up summary field of Bug__c on Account
Incorrect.
Roll-up summary fields require a master-detail relationship.
Does not address the many-to-many requirement.
Conclusion:
To allow reporting on the many-to-many relationship, a junction object between Bug__c and Account is needed, which is Option A.
Reference:
Creating Many-to-Many Relationships
Incorrect Options:
Option B: Master-detail field on Bug__c to Account
Incorrect.

NEW QUESTION # 161
What is the result of the following code snippet?

A. 200 Accounts are inserted.
B. Account Is inserted.
C. 201 Accounts are Inserted.
D. Accounts are inserted.

Answer: D

NEW QUESTION # 162
......

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Salesforce Programmatic Development using Apex and Visualforce in Lightning Experience Sample Questions (Q157-Q162):

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