Laravel Couponables

This package provides coupons/promocodes functionality for your Laravel application leveraging Eloquent's polymorphic relationships.

The package requires PHP 8.1 or higher and Laravel 10 or higher.

---

#StandWithUkraine

---

Installation

Install the package using composer:

composer require michael-rubel/laravel-couponables

Publish the migrations:

php artisan vendor:publish --tag="couponables-migrations"

Publish the config file:

php artisan vendor:publish --tag="couponables-config"

---

Usage

After publishing migrations, apply a trait in the model you want to use as a $redeemer:

use HasCoupons;

---

Artisan command

You can add coupons to your database using Artisan command:

php artisan make:coupon YourCouponCode

Optionally, you can pass the next arguments:

'--value'         // The 'value' to perform calculations based on the coupon provided
'--type'          // The 'type' to point out the calculation strategy
'--limit'         // Limit how many times the coupon can be applied by the model
'--quantity'      // Limit how many coupons are available overall (this value will decrement)
'--expires_at'    // Set expiration time for the coupon
'--redeemer_type' // Polymorphic model type. Can as well be morph-mapped value, i.e. 'users'
'--redeemer_id'   // Redeemer model ID
'--data'          // JSON column to store any metadata you want for this particular coupon

Adding coupons using model

You can as well add coupons simply using model:

Coupon::create([
    'code'  => '...',
    'type'  => '...'
    'value' => '...',
    ...
]);

• Note: type and value columns are used for cost calculations (this is optional).
  If the type column is null, the subtraction strategy will be chosen.

---

Basic operations

Verify the coupon code:

$redeemer->verifyCoupon($code);

Redeem the coupon:

$redeemer->redeemCoupon($code);

Redeem the coupon in context of another model:

$redeemer
  ->redeemCoupon($code)
  ->for($course);

Combined redeemCoupon and for behavior (assuming the $course includes HasCoupons trait):

$course->redeemBy($redeemer, $code);

If something's going wrong, methods verifyCoupon and redeemCoupon will throw an exception:

CouponDisabledException     // Coupon is disabled (`is_enabled` column).
CouponExpiredException      // Coupon is expired (`expires_at` column).
InvalidCouponException      // Coupon is not found in the database.
InvalidCouponTypeException  // Wrong coupon type found in the database (`type` column).
InvalidCouponValueException // Wrong coupon value passed from the database (`value` column).
NotAllowedToRedeemException // Coupon is assigned to the specific model (`redeemer` morphs).
OverLimitException          // Coupon is over the limit for the specific model (`limit` column).
OverQuantityException       // Coupon is exhausted (`quantity` column).
CouponException             // Generic exception for all cases.

If you want to bypass the exception and do something else:

$redeemer->verifyCouponOr($code, function ($code, $exception) {
    // Your action with $code or $exception!
});

$redeemer->redeemCouponOr($code, function ($code, $exception) {
    // Your action with $code or $exception!
});

Redeemer checks

Check if this coupon is already used by the model:

$redeemer->isCouponAlreadyUsed($code);

Check if the coupon is over the limit for the model:

$redeemer->isCouponOverLimit($code);

Coupon checks

public function isExpired(): bool;
public function isNotExpired(): bool;
public function isDisposable(): bool;
public function isOverQuantity(): bool;
public function isRedeemedBy(Model $redeemer): bool;
public function isOverLimitFor(Model $redeemer): bool;

This method references the model assigned to redeem the coupon:

public function redeemer(): ?Model;

Calculations

$coupon = Coupon::create([
    'code'  => 'my-generated-coupon-code-to-use',
    'type'  => CouponContract::TYPE_PERCENTAGE, // 'percentage'
    'value' => '10', // <-- %10
]);

$coupon->calc(using: 300); // 270.00

The package supports three types of item cost calculations:

• subtraction - subtracts the given value from the value defined in the coupon model;
• percentage - subtracts the given value by the percentage defined in the coupon model;
• fixed - completely ignores the given value and takes the coupon model value instead.

Note: you can find constants for coupon types in the CouponContract

Listeners

If you go event-driven, you can handle package events:

• CouponVerified
• CouponRedeemed
• CouponExpired
• CouponIsOverLimit
• CouponIsOverQuantity
• NotAllowedToRedeem

---

Extending package functionality

Traits DefinesColumns and DefinesPivotColumns contain the methods that define column names to use by the package, so you can use inheritance to override them.

If you need to override the entire classes, use the config values or container bindings. All the classes in the package have their own contract (interface), so you're free to modify it as you wish.

CouponService has the Macroable trait, This way you can inject the methods to interact with the service without overriding anything.

Contributing

If you see any ways we can improve the package, PRs are welcome. But remember to write tests for your use cases.

Testing

composer test