Developers CRT-450 Salesforce Study Notes

When designing a new application on the Salesforce platform that needs to support multiple tenants effectively (i.e., multiple customers or users), the developer should consider the Model-View-Controller (MVC) framework.

Option B: Model-View-Controller (MVC)

Correct Design Framework.

Explanation:

MVC is a software architectural pattern for implementing user interfaces.

Model: Represents the data and business logic.

View: Represents the presentation layer.

Controller: Handles user input and interactions.

Salesforce's platform follows the MVC pattern, which helps in separating concerns, ensuring scalability, and maintainability.

When comparing Lightning Web Components (LWC) with Visualforce for the View layer in the MVC paradigm, several advantages stand out.

Option A: Self-contained and reusable units of an application

Correct Advantage.

Explanation:

LWCs are built using modular components that encapsulate their own structure, style, and behavior.

Components can be reused across different parts of the application, promoting consistency and reducing development time.

This modularity allows for better maintainability and scalability.

To calculate the sum of all Order Line item totals on the Order record in a master-detail relationship, the best practice is to use a Roll-up Summary Field.

Roll-up Summary Field: This field type allows you to perform calculations on a set of related records, such as summing up the total price of all Order Line items related to an Order.

"Roll-up summary fields allow you to display a value in a master record based on the values of fields in a detail record."— Salesforce Help: Define Roll-Up Summary Fields

Master-Detail Relationship: Since Order Line items are in a master-detail relationship with Orders, roll-up summary fields can be created on the master object (Order) to summarize data from the detail object (Order Line).

"You can create roll-up summary fields on any custom object that is on the master side of a master-detail relationship."— Salesforce Developer Guide: Roll-Up Summary Fields

Why Not Other Options:

A. Quick Action: Quick actions are used to create records, log calls, send emails, etc., and are not suitable for calculating and displaying aggregate data.

B. Apex Trigger: While triggers can perform the calculation, using them for this purpose is not considered best practice when declarative solutions like roll-up summary fields are available.

"Use declarative functionality (roll-up summary fields) for maintaining aggregates instead of triggers."— Salesforce Developer Guide: Best Practices for Triggers

D. Formula Field: Formula fields cannot aggregate data from child records to parent records unless they are part of a roll-up summary field in a master-detail relationship.

Conclusion: Using a roll-up summary field is the most efficient and recommended approach to sum the total prices of all Order Line items on the Order record.