AI BriefingImproving Code Quality - Session 44: Misdiagnosing the Anemic Domain Model
Key point
This analyzes how attempts to prevent domain model anemia can lead to circular dependencies and design flaws.
Details
Implementing the conversion logic between FooModel and BarModel inside each model can help avoid an Anemic Domain Model. However, this approach creates a Circular Dependency between the two modules.
To resolve this, splitting into an API module and an impl module can be used, but this produces the following side effects.
- Absence of a Single Source of Truth: the conversion logic is scattered across multiple modules, making management difficult.
- Impl module dependency: converting or creating a model requires depending on the impl module rather than the API.
- Unsafe downcasting: since the interface lacks conversion methods, downcasting is required, which carries the risk of runtime errors.
To address these issues, one option to consider is consolidating the conversion logic into a specific module to simplify the dependency structure.
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