Bird
0
0

You need to design a system for managing library books using Domain-Driven Design. Which of the following is the best way to model the Book aggregate?

hard📝 Trade-off Q8 of 15
LLD - Advanced LLD Concepts
You need to design a system for managing library books using Domain-Driven Design. Which of the following is the best way to model the Book aggregate?
ABook as a Repository storing Title and Author
BBook as a Value Object with ISBN and Title attributes
CBook as a Service that manages ISBN and Title
DBook as an Entity with unique ISBN, containing Value Objects for Title and Author details
Step-by-Step Solution
Solution:
  1. Step 1: Identify Book uniqueness

    Books have unique ISBNs, so Book should be an Entity.
  2. Step 2: Use Value Objects for descriptive data

    Title and Author details are attributes without identity, suitable as Value Objects.
  3. Final Answer:

    Book as an Entity with unique ISBN, containing Value Objects for Title and Author details -> Option D
  4. Quick Check:

    Entity for unique identity, Value Objects for attributes [OK]
Quick Trick: Unique things are Entities; descriptive data are Value Objects [OK]
Common Mistakes:
  • Modeling Book as Value Object ignoring ISBN uniqueness
  • Using Service or Repository as domain model
  • Mixing responsibilities of domain layers

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions
More LLD Quizzes