Summary
In this chapter, we delved into the heart of Clean Architecture: the Entity layer, also known as the Domain layer. We explored how to identify, model, and implement core business concepts using DDD principles.
We began by analyzing business requirements and defining a ubiquitous language for our task management system. We then examined key DDD concepts such as entities, value objects, and bounded contexts, seeing how they align with Clean Architecture principles.
Next, we implemented these concepts in Python, creating rich domain entities such as Task and value objects such as Priority and Deadline. We encapsulated business rules within these entities, ensuring they maintain their integrity regardless of how they’re used in the broader application.
Finally, we focused on ensuring the independence of the Entity layer, exploring strategies to avoid external dependencies and maintain clear boundaries between our core domain logic and infrastructure concerns...
