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Materacl
Jun 5, 2025

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Answered by StalinidzeCorp Jun 5, 2025

Dependency Inversion Principle (DIP) is the backbone of Onion Architecture. Here’s why it’s essential:

  1. Decouples Layers for True Independence
  • Onion Architecture mandates that inner layers (Domain/Business Logic) must never depend on outer layers (Infrastructure/UI).
  • DIP enforces this by:
    • Defining abstractions (interfaces) in the inner layers.
    • Implementing those abstractions in outer layers (e.g., databases, APIs).
  • Example:
# Inner layer (Domain) defines the interface
class IUserRepository(ABC):
    @abstractmethod
    def get_user(self, user_id: int) -> User: ...

# Outer layer (Infrastructure) implements it
class SQLUserRepository(IUserRepository):
    def get_user(self, user_id
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@Materacl @StalinidzeCorp