Create Command

Command Generator

Generate CQRS-compliant Commands and Command Handlers with tests.

Command Characteristics

• Immutable: final readonly class
• Imperative naming: Verb + noun (CreateOrder, ConfirmPayment)
• Self-validating: Validates invariants in constructor
• Intent-revealing: Name describes what should happen
• Returns void or ID: Never returns data

Generation Process

Step 1: Generate Command

Path: src/Application/{BoundedContext}/Command/

1. {Name}Command.php — Immutable command DTO

Step 2: Generate Handler

Path: src/Application/{BoundedContext}/Handler/

1. {Name}Handler.php — Command processor

Step 3: Generate Tests

Path: tests/Unit/Application/{BoundedContext}/

File Placement

Command Naming Conventions

Quick Template Reference

Command

final readonly class {Name}Command
{
    public function __construct(
        public {ValueObject} $id,
        public string $data
    ) {
        if (empty($data)) {
            throw new \InvalidArgumentException('Data is required');
        }
    }

    public static function fromArray(array $data): self
    {
        return new self(
            id: new {ValueObject}($data['id']),
            data: $data['data']
        );
    }
}

Handler (Update Flow)

final readonly class {Name}Handler
{
    public function __construct(
        private {Repository}Interface $repository,
        private EventDispatcherInterface $events
    ) {}

    public function __invoke({Name}Command $command): void
    {
        $aggregate = $this->repository->findById($command->id);

        if ($aggregate === null) {
            throw new NotFoundException($command->id);
        }

        $aggregate->doSomething($command->data);

        $this->repository->save($aggregate);

        foreach ($aggregate->releaseEvents() as $event) {
            $this->events->dispatch($event);
        }
    }
}

Handler (Create Flow)

public function __invoke(CreateCommand $command): AggregateId
{
    $aggregate = Aggregate::create(
        id: $this->repository->nextIdentity(),
        ...
    );

    $this->repository->save($aggregate);

    foreach ($aggregate->releaseEvents() as $event) {
        $this->events->dispatch($event);
    }

    return $aggregate->id();
}

Anti-patterns to Avoid

References

For complete PHP templates and examples, see:

• references/templates.md — Command, Handler, Test templates with patterns
• references/examples.md — CreateOrder, ConfirmOrder, CancelOrder examples and tests

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