# Anemic Domain Model

> A defect in which domain objects hold data only, while their rules live in services and handlers.

Record: `architecture:anemic-domain-model`
Kind: anti-pattern
Layer: [Enforcement Core](https://banes-lab.com/records/layer/enforcement-core.md)
Severity: discouraged
Scope: modularity, contract_compatibility, semantic_consistency, model_governance, domain_boundary
Canonical: https://banes-lab.com/ontology#architecture-anemic-domain-model

Listed in [Architecture principles](https://banes-lab.com/api/records/architecture.md), after [Null Semantics Drift](https://banes-lab.com/records/architecture/null-semantics-drift.md) and before [Transaction Script Sprawl](https://banes-lab.com/records/architecture/transaction-script-sprawl.md).

## Repair

- Refactored by: move_behavior_to_domain, add_value_object, add_aggregate_invariant, encapsulate_state
- Detected by: entities_with_getters_setters_only, services_contain_all_rules, validation_outside_aggregate
- Violated by: Store domain data in passive objects while business rules live in services, controllers, handlers, or scripts.
- Measured by: domain types without behavior, rules outside their aggregate
- Enforced by: architecture tests that locate domain rules, [design review](https://banes-lab.com/records/architecture/design-review.md)

## Severity

- [discouraged](https://banes-lab.com/records/vocabulary/severity-discouraged.md)

## Category

- [Anti-patterns](https://banes-lab.com/records/architecture-category/anti-patterns.md)

## Force

- [Contract compatibility](https://banes-lab.com/records/force/contract-compatibility.md)
- [Domain boundary](https://banes-lab.com/records/force/domain-boundary.md)
- [Model governance](https://banes-lab.com/records/force/model-governance.md)
- [Modularity](https://banes-lab.com/records/force/modularity.md)
- [Semantic consistency](https://banes-lab.com/records/force/semantic-consistency.md)

## Negated by

- [Aggregate](https://banes-lab.com/records/architecture/aggregate.md)
- [Entity](https://banes-lab.com/records/architecture/entity.md)

## Linked from

- [Seven controls, seven classes](https://banes-lab.com/software-architecture/decay/seven-controls-seven-classes.md)
- [Anti-patterns](https://banes-lab.com/ontology/principles/architecture-category-anti-patterns.md)
- [Domain Architecture](https://banes-lab.com/ontology/principles/architecture-category-domain-architecture.md)
- [Severity levels](https://banes-lab.com/ontology/schema/the-vocabulary-severity.md)
- [The forces](https://banes-lab.com/ontology/schema/the-forces.md)