Deptrac Fixer Skill

Context (Input)

• make deptrac reports violations
• Error message contains "must not depend on"
• Domain layer has framework imports (Symfony, Doctrine, API Platform)
• Infrastructure directly calls Application handlers
• Any architectural boundary violation detected

Task (Function)

Diagnose and fix Deptrac violations by refactoring code to respect hexagonal architecture boundaries.

Success Criteria: make deptrac outputs "✅ No violations found"

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Core Principle

Fix the code, NEVER modify deptrac.yaml

The architecture is correct. The code must conform to it, not vice versa.

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Quick Start: Fix a Violation

Step 1: Run Deptrac

make deptrac

Step 2: Parse Violation Message

Domain must not depend on Symfony
  src/Customer/Domain/Entity/Customer.php:8
    uses Symfony\Component\Validator\Constraints as Assert

Extract:

• Violating Layer: Domain
• Forbidden Dependency: Symfony
• File & Line: src/Customer/Domain/Entity/Customer.php:8
• Violation Type: uses (import statement)

Step 3: Identify Fix Pattern

Domain Depends On	Fix Pattern	Example File
Symfony Validator	Move to YAML config	01-domain-symfony-validation.php
Doctrine (ODM/ORM)	Use XML mapping	02-domain-doctrine-annotations.php
API Platform	Move to YAML config	03-domain-api-platform.php
Infrastructure → Handler	Use Command Bus	04-infrastructure-handler.php

See: REFERENCE.md for complete fix patterns and advanced scenarios.

Step 4: Apply Fix

Follow the pattern from examples, then verify:

make deptrac

Repeat until: "✅ No violations found"

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Layer Dependency Rules

Domain ─────────────────> (NO dependencies)
           │
           │
Application ──────────> Domain + Infrastructure + Symfony + API Platform
           │
           │
Infrastructure ───────> Domain + Application + Symfony + Doctrine

Allowed Dependencies:

Layer	Can Depend On
Domain	❌ Nothing (pure PHP only)
Application	✅ Domain, Infrastructure, Symfony, API Platform
Infrastructure	✅ Domain, Application, Symfony, Doctrine, MongoDB

See: CODELY-STRUCTURE.md for complete directory hierarchy.

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Common Fix Patterns (Quick Reference)

Pattern 1: Domain → Symfony Validator

❌ Problem: Validation annotations in Domain entity

use Symfony\Component\Validator\Constraints as Assert;

class Customer {
    #[Assert\NotBlank]
    private string $name;
}

✅ Solution: Move validation to config/validator/{Entity}.yaml

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Pattern 2: Domain → Doctrine Annotations

❌ Problem: Doctrine attributes in Domain entity

use Doctrine\ODM\MongoDB\Mapping\Annotations as ODM;

#[ODM\Document]
class Customer { }

✅ Solution: Create XML mapping in config/doctrine/{Entity}.mongodb.xml

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Pattern 3: Domain → API Platform

❌ Problem: API Platform attributes in Domain entity

use ApiPlatform\Metadata\ApiResource;

#[ApiResource]
class Customer { }

✅ Solution: Create YAML config in config/api_platform/resources/{entity}.yaml

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Pattern 4: Infrastructure → Application Handler

❌ Problem: Direct handler call from Infrastructure

class Repository {
    public function __construct(
        private SomeHandler $handler  // ❌ Circular dependency
    ) {}
}

✅ Solution: Use Command Bus pattern

class Repository {
    public function __construct(
        private CommandBusInterface $commandBus  // ✅ Interface
    ) {}

    public function someMethod() {
        $this->commandBus->dispatch(new SomeCommand());
    }
}

See: examples/ directory for complete, runnable examples.

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Diagnostic Workflow

When facing multiple violations:

Step 1: Get All Violations

make deptrac > violations.txt

Step 2: Categorize by Type

Group violations by layer pair:

• Domain → Symfony
• Domain → Doctrine
• Domain → API Platform
• Infrastructure → Application
• etc.

Step 3: Fix in Priority Order

1. Domain violations first (most critical)
2. Infrastructure violations (circular dependencies)
3. Application violations (least common)

Step 4: Verify Incrementally

# After each fix
make deptrac

Track progress: 15 violations → 10 → 5 → 0 ✅

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Constraints

NEVER

• Modify deptrac.yaml to allow violations
• Disable Deptrac checks
• Add suppression comments
• Create "wrapper" classes to hide dependencies
• Move entire class to wrong layer just to satisfy Deptrac
• Use reflection or dynamic loading to bypass checks

ALWAYS

• Fix the code to match the architecture
• Keep Domain layer pure (no framework imports)
• Use interfaces for cross-layer dependencies
• Move configuration to YAML/XML files
• Verify fixes with make deptrac after each change
• Check that tests still pass after refactoring

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Format (Output)

Expected Deptrac Output

Deptrac

Checking dependencies...

✅ No violations found

Expected CI Output

✅ CI checks successfully passed!

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Verification Checklist

After fixing violations:

• make deptrac shows 0 violations
• Domain entities have no framework imports
• Validation moved to config/validator/
• Doctrine mapping moved to config/doctrine/
• API Platform config moved to config/api_platform/
• Infrastructure uses Command Bus, not direct handler calls
• All tests still pass (make all-tests)
• make ci passes completely

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Related Skills

• implementing-ddd-architecture - Understanding DDD patterns and layer responsibilities
• api-platform-crud - YAML-based API Platform configuration
• database-migrations - XML-based Doctrine mappings
• complexity-management - Refactoring without breaking architecture

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Quick Commands

# Run Deptrac analysis
make deptrac

# Check specific layer violations (if supported)
vendor/bin/deptrac analyze --report-uncovered

# Verify architecture after fixes
make deptrac && make ci

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Reference Documentation

For detailed patterns, examples, and troubleshooting:

• REFERENCE.md - Complete fix patterns for all violation types
• CODELY-STRUCTURE.md - Directory hierarchy and file placement rules
• examples/ - Complete, runnable code examples:
  • 01-domain-symfony-validation.php - Fixing Symfony validation violations
  • 02-domain-doctrine-annotations.php - Removing Doctrine imports
  • 03-domain-api-platform.php - Moving API Platform config
  • 04-infrastructure-handler.php - Using Command Bus pattern

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Anti-Patterns to Avoid

❌ DON'T Modify deptrac.yaml

# ❌ NEVER DO THIS
paths:
  - { collector: layer_domain, exclude: '.*Annotation.*' } # Hiding violations

❌ DON'T Create Wrapper Classes

// ❌ BAD: Hiding framework dependency
class MyValidator {
    private SymfonyValidator $validator;  // Still violates!
}

❌ DON'T Move Classes to Wrong Layer

// ❌ BAD: Moving Domain entity to Application to "fix" violation
// src/Application/Entity/Customer.php  // WRONG LAYER!

✅ DO Fix the Root Cause

• Extract validation to YAML
• Move configuration to XML
• Use interfaces and dependency inversion
• Respect layer responsibilities

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Success Criteria Summary

• ✅ Zero Deptrac violations
• ✅ Domain layer pure (no framework imports)
• ✅ All configuration externalized (YAML/XML)
• ✅ Proper use of Command Bus for cross-layer communication
• ✅ All tests passing
• ✅ CI pipeline green