create-value-object

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Create Value Object for domain modeling following DDD patterns. Use when you need to encapsulate primitive values with validation, business rules, and immutability. Creates reusable VOs like PriceField, EmailField, QuantityField with validation and domain logic.

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[Code Generation]

When & Why to Use This Skill

This Claude skill streamlines domain-driven development by generating immutable Value Objects (VOs) with built-in validation. It helps developers implement DDD patterns effectively, ensuring that primitive values are encapsulated with business logic and type safety, which improves overall code quality and maintainability.

Use Cases

  • Domain Modeling: Automatically generate standardized objects like EmailField, PriceField, or QuantityField to ensure consistent validation across the application.
  • Refactoring: Replace 'primitive obsession' by converting raw data types (strings, ints) into meaningful, type-safe Value Objects that carry domain logic.
  • Architecture Standardization: Enforce DDD best practices by creating final readonly classes with private constructors and static factory methods through a unified template.
  • Data Integrity: Implement robust input validation at the domain level to prevent invalid data states from propagating through the system.
namecreate-value-object
descriptionCreate Value Object for domain modeling following DDD patterns. Use when you need to encapsulate primitive values with validation, business rules, and immutability. Creates reusable VOs like PriceField, EmailField, QuantityField with validation and domain logic.

Create Value Object

Generate immutable Value Object with validation and business rules.

When to Use

  • Encapsulate primitive values (string, int, float)
  • Add validation to domain values
  • Avoid primitive obsession
  • Create reusable domain concepts

Inputs/Outputs

Input Example Output
name PriceField Shared/Entities/VO/ValueObjectName.php (if shared)
type string, int BC/Entities/VO/ValueObjectName.php (if BC-specific)
validation ['min' => 0] -
location Shared, Admin -

Process

Step Action
Create Use template: value-object.php.tpl
Validate make cs-fixer && make stan

Structure

Value Object (final readonly, private constructor, static factory):

final readonly class ValueObjectName {
    private function __construct(private TypeHere $value) {}

    public static function fromString(string $value): self {
        if (empty($value)) {
            throw InvalidValueObject::empty();
        }
        return new self($value);
    }

    public function toString(): string { return $this->value; }
    public function equals(self $other): bool { return $this->value === $other->value; }
}

See: docs/GLOSSARY.md#value-object for detailed definition

Rules

Class Structure:

  • final readonly class, private constructor
  • Static factory: fromString(), fromInt(), fromCents(), etc.
  • Immutable (no setters)

Validation:

  • In factory method
  • Throw domain exceptions (not generic)
  • Clear error messages

Methods:

  • Getter: toString(), toInt(), toFloat()
  • Comparison: equals(), isGreaterThan(), etc.
  • Business logic if needed (e.g., add(), multiply())

Location Decision:

  • Shared/Entities/VO/ if used across multiple BCs (ResourceUuid, EmailField, NameField, PriceField)
  • BC/Entities/VO/ if BC-specific only (ArticleReference, SupplierCode, TaxRate)

Templates

  • value-object.php.tpl

Location: .claude/templates/

References

  • Value Object definition: docs/GLOSSARY.md#value-object
  • Value Object pattern: docs/QUICK_REF.md#value-object-pattern
  • Architecture: docs/architecture.md#value-objects
  • Shared VOs: src/Shared/Entities/VO/
  • create-entity - Use VOs in entities
  • create-use-case - Pass VOs in requests