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Salesforce Platform Developer I (PDI) Sample Questions (Q34-Q39):

NEW QUESTION # 34
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. Include <apex:messages> on the Visualforce page.
B. Perform the DML using the patabase.upsert () method.
C. Use a try/catch with a custom exception class.
D. Add custom controller attributes to display the message.

Answer: A

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 # 35
A visualforce interface is created for Case Management that includes both standard and custom functionality defined in an Apex class called myControllerExtension. The visualforce page should include which
<apex:page> attribute(s) to correctly implement controller functionality?

A. StandardController = "case" and extensions =" myControllerExtension"
B. Extensions=" myControllerExtension"
C. Controller = "case" and extensions =" myControllerExtension"
D. Controller=" myControllerExtension"

Answer: A

NEW QUESTION # 36
Universal Containers decides to use exclusively declarative development to build out a new Salesforce application.
Which three options should be used to build out the database layer for the application?
Choose 3 answers

A. Flows
B. Roll-up summaries
C. Custom objects and fields
D. Triggers
E. Relationships

Answer: B,C,E

Explanation:
* A: Custom objects and fields are the fundamental building blocks of the database layer in Salesforce for creating and storing custom data.
* C: Roll-up summary fields are a declarative feature used to perform calculations (e.g., sum, count) on child records and display the results on the parent record.
* D: Relationships (e.g., master-detail, lookup) are essential for defining how data objects are related to each other.
Why not other options?
* B: Triggers are a programmatic solution, which goes against the declarative-only requirement.
* E: Flows are used for automation and logic, not for building the database layer.
References:
* Salesforce Data Modeling

NEW QUESTION # 37
Given the following Apex statement:

What occurs when more than one Account is returned by the SOQL query?

A. The variable, myaccount, is automatically cast to the List data type.
B. The first Account returned is assigned to myAccount,
C. The query fails and an error is written to the debug log.
D. An unhandled exception is thrown and the code terminates.

Answer: D

NEW QUESTION # 38
In the following example, which sharing context will myMethod execute when it is invoked?

A. Sharing rules will be Inherited from the calling context.
B. Sharing rules will be enforced by the instantiating class.
C. Sharing rules will not be enforced for the running user.
D. Sharing rules will be enforced for the running user.

Answer: A

NEW QUESTION # 39
......

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