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PackageSku.php
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PackageSku.php
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<?php
namespace App;
use Illuminate\Database\Eloquent\Relations\Pivot;
/**
* Link SKUs to Packages.
*
* @property int $cost
* @property string $package_id
* @property \App\Package $package
* @property int $qty
* @property \App\Sku $sku
* @property string $sku_id
*/
class PackageSku extends Pivot
{
/** @var array<int, string> The attributes that are mass assignable */
protected $fillable = [
'package_id',
'sku_id',
// to set the costs here overrides the sku->cost and package->discount_rate, see function
// cost() for more detail
'cost',
'qty'
];
/** @var array<string, string> The attributes that should be cast */
protected $casts = [
'cost' => 'integer',
'qty' => 'integer'
];
/** @var array<int, string> The attributes that can be not set */
protected $nullable = [
'cost',
];
/** @var string Database table name */
protected $table = 'package_skus';
/** @var bool Indicates if the model should be timestamped. */
public $timestamps = false;
/**
* Under this package, how much does this SKU cost?
*
* @return int The costs of this SKU under this package in cents.
*/
public function cost(): int
{
$units = $this->qty - $this->sku->units_free;
if ($units < 0) {
return 0;
}
// one way is to set a very nice looking price in the package_sku->cost
// this should not be modified by a discount_rate or else there is no purpose to choose
// that nicely looking pricepoint
//
// the other way is to take the sku list price, but sell the package with a percentage
// discount; this way a nice list price of 1399 with a 15% discount ends up with an "ugly"
// 1189.15 that needs to be rounded and ends up 1189
//
// additional discounts could come from discount vouchers
// Side-note: Package's discount_rate is on a higher level, so conceptually
// I wouldn't be surprised if one would expect it to apply to package_sku.cost.
if ($this->cost !== null) {
$ppu = $this->cost;
} else {
$ppu = round($this->sku->cost * ((100 - $this->package->discount_rate) / 100));
}
return $units * $ppu;
}
/**
* Under this package, what fee this SKU has?
*
* @return int The fee for this SKU under this package in cents.
*/
public function fee()
{
$units = $this->qty - $this->sku->units_free;
if ($units < 0) {
$units = 0;
}
return $this->sku->fee * $units;
}
/**
* The package for this relation.
*
* @return \Illuminate\Database\Eloquent\Relations\BelongsTo
*/
public function package()
{
return $this->belongsTo(Package::class);
}
/**
* The SKU for this relation.
*
* @return \Illuminate\Database\Eloquent\Relations\BelongsTo
*/
public function sku()
{
return $this->belongsTo(Sku::class);
}
}

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