README

Reusable availability rule engine for Laravel models. Attach rules to any Eloquent model and evaluate allow/deny windows with a predictable "last matching rule wins" policy.

This package is brought to you by Romega Software. Romega Software is software development agency specializing in helping customers integrate AI and custom software into their business, helping companies in growth mode better acquire, visualize, and utilize their data, and helping entrepreneurs bring their ideas to life.

Installation

1. Install via Composer:

composer require romegasoftware/availability

1. Publish the config and optional migrations if you need to customise them:

php artisan vendor:publish --tag=availability-config
php artisan vendor:publish --tag=availability-migrations

The service provider auto-registers and the default table name is availability_rules.

Getting Started

1. Add the HasAvailability trait (or implement AvailabilitySubject) on your model.
2. Create availability rules through the morph relation:

$item->availabilityRules()->create([
    'type' => 'months_of_year',
    'config' => ['months' => [7]],
    'effect' => 'allow',
    'priority' => 10,
]);

1. Resolve the engine and evaluate a moment:

$engine = app(\RomegaSoftware\Availability\Support\AvailabilityEngine::class);

if ($engine->isAvailable($item, now())) {
    // accept the booking
}

Rules are evaluated in the subject's timezone (getAvailabilityTimezone) with a default allow/deny policy provided by getAvailabilityDefaultEffect. The final matching rule controls the outcome.

Rule Types

Configure rule->type to one of the following and store the payload in config:

Combine types for richer policies (e.g. weekdays allow + time_of_day allow + blackout_date deny).

Inventory Gate Resolver

Provide inventory lookups through config:

config(['availability.inventory_gate' => [
    'resolver' => function (AvailabilitySubject $subject, CarbonInterface $moment, array $ruleConfig): int {
        return $subject->currentStock();
    },
]]);

You may also register resolvers per subject class in availability.inventory_gate.resolvers. Resolver return values:

• numeric → compared against config['min']
• boolean → used directly

Resolvers are cached per subject class, so configure them during boot.

Custom Evaluators

Register additional evaluators in config('availability.rule_types') and implement RuleEvaluator::matches(). The registry accepts concrete instances, class names, or container factories.

Testing

composer test

When shipping new rules, add cases that cover DST boundaries, year transitions, and denial precedence to keep behaviour stable.