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bd-validation-rule

Add pure attribute-based validation rules to the BetterData library.

21|1|Updated Apr 29, 2026
Search Tags:#validation#php#rules#json-schema#attribute#built-in#data-object
One-click install
npx skills add https://github.com/Lonsdale201/wp-agent-skills --skill bd-validation-rule
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: bd-validation-rule
Source: https://github.com/Lonsdale201/wp-agent-skills/tree/main/better-data/bd-validation-rule
Command: npx skills add https://github.com/Lonsdale201/wp-agent-skills --skill bd-validation-rule

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Enforces the addition of new, pure validation rules to BetterData by implementing the Rule interface and decorating data objects with #[Rule] attributes, ensuring rules remain predictable and composable.

Core Features & Use Cases

  • Pure, attribute-based rules that implement the Rule contract.
  • Automatic null handling: rules skip null values unless paired with #[Required].
  • Use Case: introduce a new rule to enforce a specific data format on a DTO field.

Quick Start

Create a new PHP class implementing BetterData\Validation\Rule, add a #[Rule] attribute, and wire it into the validation system.

Frequently Asked Questions about bd-validation-rule

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I add custom validation rules to a PHP data object using attributes?▼

To add custom validation rules to a PHP data object, create a final readonly class implementing the Rule interface and apply it as a pure attribute on your DTO fields.

How does null value handling work in pure attribute-based validation rules?▼

Pure attribute-based validation rules automatically skip null values unless the field is explicitly paired with a Required attribute, ensuring rules remain predictable.

What interface contract must a new PHP validation rule implement?▼

A new PHP validation rule must implement the contract public function check(mixed $value, string $fieldName, DataObject $subject): ?string, returning a short error message.

Can I map custom validation rules to a JSON Schema?▼

Yes, custom validation rules can optionally map to JSON Schema through RestSchemaBuilder when extending the validation system with new Rule classes.

Why should validation rules use final readonly classes in PHP?▼

Validation rules require final readonly classes to enforce predictable, composable behavior and prevent state modification during the data object validation process.

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