PD2 practice questions 141–150

1. Question 141 · 279 in bank

   Select 2

   A developer wants to call an Apex Server-side Controller from a Lightning Aura Component. What are two limitations to the data being returned by the Controller? (Choose two.)

   • AA custom Apex Class can be returned, but only the values of public instance properties and methods annotated with @AuraEnabled are serialized and returned.
   • BLists of Custom Apex Classes cannot be returned by Apex Controllers called by Lightning Aura Components.
   • CBasic data types are supported, but defaults, such as maximum size for a number, are defined by the objects that they map to.
   • DOnly Basic data types and sObjects are supported as return types for Apex Controllers called by Lightning Aura Components.

   Show answer

   Answer: AC

   Explanation

   According to the documentation: https://developer.salesforce.com/docs/atlas.en-us.lightning.meta/lightning/controllers_server_apex_returning_data.htm Results data from an Apex server-side controller must be serializable into JSON format. This means that only basic data types and sObjects are supported as return types for Apex controllers called by Lightning Aura Components. Lists of custom Apex classes can also be returned, but only the values of public instance properties and methods annotated with @AuraEnabled are serialized and returned. In this case, the correct answers are A and D

   Source: Adapted from community discussion — moitam

   References

   • developer.salesforce.com documentation

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2. Question 142 · 279 in bank

   An org has a requirement that the Shipping Address on the Account must be validated by a third-party web service, before the Account is allowed to be inserted. This validation must happen in real-time before the account is inserted into the system. Additionally, the developer wants to prevent the consumption of unnecessary SME statements. What is the optimal way to meet this requirement?

   • AMake a callout to the web service from a custom Visualforce controller.
   • BMake a callout to the web service from a before insert trigger.
   • CMake a callout to the web service from a standard Visualforce controller.
   • DMake a callout to the web service from an after insert trigger.

   Show answer

   Answer: A

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3. Question 143 · 279 in bank

   Select 3

   Which three approaches should a developer implement to obtain the best performance for data retrieval when building a Lightning web component? (Choose three.)

   • AUse (Cacheable=true) whenever possible.
   • BUse the Lightning Data Service.
   • CUse layoutTypes: [‘Full’] to display a set of fields.
   • DUse lazy load for occasionally accessed data.
   • EUse getRecordUi to obtain metadata.

   Show answer

   Answer: ABE

   References

   • developer.salesforce.com documentation

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4. Question 144 · 279 in bank

   Select 2

   Which two scenarios require an Apex method to be called imperatively from a Lightning web component? (Choose two.)

   • ACalling a method that makes a web service callout
   • BCalling a method that is not annotated with cacheable=true
   • CCalling a method with the click of a button
   • DCalling a method that is external to the main controller for the Lightning web component

   Show answer

   Answer: BC

   References

   • developer.salesforce.com documentation

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5. Question 145 · 279 in bank

   Refer to the code snippet below:

   

   A custom object called Credit_Memo_c exists in a Salesforce environment. As part of a new feature development that retrieves and manipulates this type of record, the developer needs to ensure race conditions are prevented when a set of records are modified within an Apex transaction. In the preceding Apex code, how can the developer alter the query statement to use SOQL features to prevent race conditions within a transaction?

   • A[Select Id, Name, Amount_c FROM Credit_Memo_c WHERE Customer_Id_c = :customerId LIMIT 50 FOR VIEW]
   • B[Select Id, Name, Amount_c FROM Credit_Memo_c WHERE Customer_Id_c = :customerId LIMIT 50 FOR UPDATE]
   • C[Select Id, Name, Amount_c FROM Credit_Memo_c WHERE Customer_Id_c = :customerId USING SCOPE LIMIT 50]
   • D[Select Id, Name, Amount_c FROM Credit_Memo_c WHERE Customer_Id_c = :customerId LIMIT 50 FOR REFERENCE]

   Show answer

   Answer: B

   References

   • developer.salesforce.com documentation

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6. Question 146 · 279 in bank

   Select 3

   Refer to the code snippet below:

   

   When a Lightning web component is rendered, a list of opportunities that match certain criteria should be retrieved from the database and displayed to the end-user. Which three considerations must the developer implement to make the fetchOpportunities method available within the Lightning web component? (Choose three.)

   • AThe method must specify the (cacheable=true) attribute.
   • BThe method must specify the (continuation=true) attribute.
   • CThe method must be annotated with the @AuraEnabled annotation.
   • DThe method must be annotated with the @InvocableMethod annotation.
   • EThe method cannot mutate the result set retrieved from the database.

   Show answer

   Answer: ACE

   Explanation

   ACE Continuation is used in the case of external communication with other servers (API calls). This question makes no mention of outside communication. However, data retrieved from Salesforce cannot be directly manipulated. It must first be saved in a variable that will hold it's value as it goes through changes and then it can be sent back to update.

   Source: Adapted from community discussion — Sapphire808

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7. Question 147 · 279 in bank

   A developer is building a Lightning web component that retrieves data from Salesforce and assigns it to the record property.

   

   What must be done in the component to get the data from Salesforce?

   • AAdd the following code above record; @wire(getRecord, { recordId: ‘$recordId’, fields: ‘$fields’ })
   • BAdd the following code above record; @wire(getRecord, { recordId: ‘$recordId’ }) Get the fields in renderedCallback() and assign them to record.
   • CAdd the following code above record; @api(getRecord, { recordId: ‘$recordId’ }) Get the fields in renderedCallback() and assign them to record.
   • DAdd the following code above record; @api(getRecord, { recordId: ‘$recordId’, fields: ‘$fields’ })

   Show answer

   Answer: A

   References

   • developer.salesforce.com documentation
   • developer.salesforce.com documentation

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8. Question 148 · 279 in bank

   Which interface needs to be implemented by a Lightning Component so that it may be displayed in modal dialog by clicking a button on a Lightning Record page?

   • Aforce:lightningQuickAction
   • Blightning:quickAction
   • Clightning:editAction
   • Dforce:lightningEditAction

   Show answer

   Answer: A

   Explanation

   Add the force:lightningQuickAction interface to a Lightning component to allow it to be used as a custom action in Lightning Experience or the Salesforce - correct Answer : A

   Source: Adapted from community discussion — Sri_Vathsa

   References

   • developer.salesforce.com documentation

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9. Question 149 · 279 in bank

   A company manages information about their product offerings in custom objects named Catalog and Catalog Item. Catalog Item has a master-detail field to Catalog, and each Catalog may have as many as 100,000 Catalog Items. Both custom objects have a CurrencyIsoCode Text field that contains the currency code they should use. If a Catalog’s CurrencyIsoCode changes, all of its Catalog Items’ CurrencyIsoCodes should be changed as well. What should a developer use to update the CurrencIsoCodes on the Catalog Items when the Catalog’s CurrencyIsoCode changes?

   • AAn after insert trigger on Catalog that updates the Catalog Items if the Catalog’s CurrencyIsoCode is different.
   • BA Database.Schedulable and Database.Batchable class that queries the Catalog object and updates the Catalog Items if the Catalog CurrencyISoCode is different.
   • CAn after insert trigger on Catalog Item that updates the Catalog Items if the Catalog’s CurrencyIsoCode is different.
   • DA Database.Schedulable and Database.Batchable class that queries the Catalog Item object and updates the Catalog Items if the Catalog CurrencyISoCode is different.

   Show answer

   Answer: D

   Explanation

   D because - 100.000 records can't be handled by Trigger (DML Limit is 10.000) - The "big" object is Catalog Item, not Catalog, therefore we need to batch through these

   Source: Adapted from community discussion — stan_malta

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10. Question 150 · 279 in bank

    A company has a custom object Sales_Help_Request_c that has a Lookup relationship to Opportunity. The Sales_Help_Request_c has a number field, Number_of_Hours_c, that represents the amount of time spent on the Sales_Help_Request_c. A developer is tasked with creating a field, Total_Hours_c, on Opportunity that should be the sum of all of the Number_of_Hours_c values for the Sales_Help_Request_c records related to that Opportunity. What should the developer use to implement this?

    • AA trigger on Sales_Help_Request_c
    • BA roll-up summary field on the Opportunity object
    • CA trigger on the Opportunity object
    • DA workflow rule on the Sales_Help_Request_c object

    Show answer

    Answer: A

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PD2 practice, question 141. 279 questions available.