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
	{
	protected $fillable = [
	'package_id',
	'sku_id',
	'cost',
	'qty'
	];

	protected $casts = [
	'cost' => 'integer',
	'qty' => 'integer'
	];

	/**
	* Under this package, how much does this SKU cost?
	*
	* @return int The costs of this SKU under this package in cents.
	*/
	public function cost()
	{
	$costs = 0;

	$units = $this->qty - $this->sku->units_free;

	if ($units < 0) {
	\Log::debug(
	"Package {$this->package_id} is misconfigured for more free units than qty."
	);

	$units = 0;
	}

	$ppu = $this->sku->cost * ((100 - $this->package->discount_rate) / 100);

	$costs += $units * $ppu;

	return $costs;
	}

	public function package()
	{
	return $this->belongsTo('App\Package');
	}

	public function sku()
	{
	return $this->belongsTo('App\Sku');
	}
	}