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Lunar provides currency-aware price formatting and display for storefront use.

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Overview

When displaying prices on a storefront, it is important to show the correct format relative to the currency the customer is purchasing in. Every storefront is different. Lunar provides a default price formatter that suits most use cases, while also making it straightforward to swap in a custom implementation for stores with specific formatting requirements.

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The Price model

Lunar\Models\Price
FieldTypeDescription
idbigIncrementsPrimary key
customer_group_idforeignId nullableAssociated customer group for tiered pricing
currency_idforeignIdAssociated currency
priceable_typestringMorph type for the parent model
priceable_idunsignedBigIntegerMorph ID for the parent model
priceunsignedBigIntegerPrice value stored in the smallest currency unit (e.g. cents)
compare_priceunsignedBigInteger nullableComparison/original price for displaying discounts
min_quantityintegerMinimum quantity required for this price tier (default: 1)
created_attimestamp
updated_attimestamp
Both the price and compare_price fields are automatically cast to Lunar\DataTypes\Price objects when accessed.

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Relationships

RelationshipTypeRelated ModelDescription
priceableMorphToVariousThe model this price belongs to (e.g. ProductVariant)
currencyBelongsToLunar\Models\CurrencyThe currency for this price
customerGroupBelongsToLunar\Models\CustomerGroupOptional customer group for group-specific pricing

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Tax helper methods

The Lunar\Models\Price model provides methods for retrieving prices with or without tax applied, based on the lunar.pricing.stored_inclusive_of_tax configuration value. 
use Lunar\Models\Price;

$price = Price::find(1);

$price->priceExTax();        // Lunar\DataTypes\Price
$price->priceIncTax();       // Lunar\DataTypes\Price
$price->comparePriceIncTax(); // Lunar\DataTypes\Price

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The Price data type

The Lunar\DataTypes\Price class is used throughout Lunar whenever a price value needs formatting. It is not limited to the Lunar\Models\Price model. The following models also have attributes that return Lunar\DataTypes\Price instances:

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Lunar\Models\Order

  • sub_total
  • discount_total
  • shipping_total
  • tax_total
  • total

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Lunar\Models\OrderLine

  • unit_price
  • sub_total
  • discount_total
  • tax_total
  • total

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Lunar\Models\Transaction

  • amount

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Price formatting

The class responsible for price formatting is configured in the config/lunar/pricing.php file: 
return [
    // ...
    'formatter' => \Lunar\Pricing\DefaultPriceFormatter::class,
];

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DefaultPriceFormatter

The Lunar\Pricing\DefaultPriceFormatter ships with Lunar and handles most use cases for formatting a price. To demonstrate, start by creating a standard price model: 
use Lunar\Models\Price;

$priceModel = Price::create([
    // ...
    'price' => 1000, // Stored as an integer in the smallest currency unit
    'min_quantity' => 1,
]);

// Lunar\DataTypes\Price
$priceDataType = $priceModel->price;

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Raw value

Return the raw integer value as stored in the database: 
$priceDataType->value; // 1000

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Decimal value

Return the decimal representation of the price. The decimal value accounts for the number of decimal places configured on the currency. For example, if the currency has 2 decimal places: 
$priceDataType->decimal(rounding: true); // 10.00
$priceDataType->unitDecimal(rounding: true); // 10.00
These two values are identical in this example. The unitDecimal method factors in the unit_quantity of the purchasable model. Consider the following: 
use Lunar\Models\ProductVariant;

$productVariant = ProductVariant::create([
    // ...
    'unit_quantity' => 10,
]);
By setting unit_quantity to 10, Lunar is told that 10 individual units make up this product at this price point. This is useful for items where a single unit would cost less than the smallest currency denomination (e.g. 0.001 EUR). 
$priceModel = $productVariant->prices()->create([
    'price' => 10, // 0.10 EUR
    'currency_id' => $currency->id,
]);

// Lunar\DataTypes\Price
$priceDataType = $priceModel->price;
Now the difference becomes clear: 
$priceDataType->decimal(rounding: true);     // 0.10
$priceDataType->unitDecimal(rounding: true); // 0.01
The unitDecimal method divides by the unit quantity, giving the per-unit cost of 0.01.

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Formatted currency string

The formatted price uses the native PHP NumberFormatter. A locale and formatting style can be specified: 
$priceDataType->formatted('fr');                                     // 10,00 £GB
$priceDataType->formatted('en-gb', \NumberFormatter::SPELLOUT);      // ten point zero zero
$priceDataType->unitFormatted('en-gb');                              // £10.00

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Full method reference

$priceDataType->decimal(
    rounding: false
);

$priceDataType->unitDecimal(
    rounding: false
);

$priceDataType->formatted(
    locale: null,
    formatterStyle: NumberFormatter::CURRENCY,
    decimalPlaces: null,
    trimTrailingZeros: true
);

$priceDataType->unitFormatted(
    locale: null,
    formatterStyle: NumberFormatter::CURRENCY,
    decimalPlaces: null,
    trimTrailingZeros: true
);

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Creating a custom formatter

A custom formatter must implement Lunar\Pricing\PriceFormatterInterface and accept $value, $currency, and $unitQty as constructor parameters. 
<?php

namespace App\Pricing;

use Illuminate\Support\Facades\App;
use Lunar\Models\Contracts\Currency;
use Lunar\Pricing\PriceFormatterInterface;
use NumberFormatter;

class CustomPriceFormatter implements PriceFormatterInterface
{
    public function __construct(
        public int $value,
        public ?Currency $currency = null,
        public int $unitQty = 1
    ) {
        if (! $this->currency) {
            $this->currency = \Lunar\Models\Currency::getDefault();
        }
    }

    public function decimal(): float
    {
        // ...
    }

    public function unitDecimal(): float
    {
        // ...
    }

    public function formatted(): mixed
    {
        // ...
    }

    public function unitFormatted(): mixed
    {
        // ...
    }
}
The methods can accept any number of arguments beyond those defined in the interface. The formatter is not bound to the same parameter signatures as DefaultPriceFormatter. Once implemented, register the custom formatter in config/lunar/pricing.php: 
return [
    // ...
    'formatter' => \App\Pricing\CustomPriceFormatter::class,
];

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Model casting

For custom models that need price formatting, Lunar provides a cast class. The only requirement is that the column stores an integer value. 
use Illuminate\Database\Eloquent\Model;
use Lunar\Base\Casts\Price;

class MyModel extends Model
{
    protected $casts = [
        // ...
        'price' => Price::class,
    ];
}
The Lunar\Base\Casts\Price cast resolves the currency from the model’s currency relationship. If no currency relationship exists, it falls back to the default currency.