Layers That Earn Their Keep

1. What is the primary responsibility of the service layer in an MVC architecture?

Translating HTTP requests into application intent Handling business logic and rules Persisting data to the database Formatting view models for presentation

2. Why should controllers not directly query the database?

It makes the code more complex It risks untestable and un-reusable logic It slows down the application performance It is against coding standards

3. What role do view models play in the architecture described in the lesson?

They represent entities directly They serve as a translation layer between entities and views They handle business logic They manage database connections

4. What should a developer ensure when implementing business logic in a view?

That it's flexible and easy to change That it belongs in the service layer instead That it operates independently of user input That it meets all performance requirements

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