The lecture explains how to enhance map operations using DTO models instead of data models. DTOs, or Data Transfer Objects, are used to transfer only necessary data between client and server, reducing payload size and hiding unnecessary details. The lecture covers the advantages of DTOs, such as data hiding, object flattening, and payload reduction. It also demonstrates how to implement DTOs in HTTP operations and define course DTOs in Web API projects. Additionally, it discusses enhancing course types with enums for better data representation.

What is the primary purpose of using DTO models in map operations?

• To enhance the speed of database queries

• To transfer only necessary data between client and server

• To increase the number of columns in a table

• To replace the need for data models entirely

Which of the following is an advantage of using DTO models?

• They help in hiding unnecessary properties

• They expose all properties of the data model

• They require more storage space

• They increase the complexity of data models

How do DTO models help in managing payload size?

• By reducing the number of properties transferred

• By adding more data types

• By increasing the number of data entries

• By duplicating data entries

In the context of DTO models, what does the term 'flattening the object' refer to?

• Combining different types of objects into a single type

• Increasing the depth of object hierarchies

• Adding more properties to an object

• Reducing the number of objects in a database

What is the purpose of defining an enum for course types in a DTO model?

• To store data as strings in the database

• To provide more detailed information to clients

• To increase the number of course types

• To simplify the database schema