WitShop/app/Models/Product.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;

class Product extends Model
{
    protected $fillable = ['category_id','name','slug','description','base_price','sale_price','tax_rate','weight','active','featured','track_stock','sort_order'];

    protected $casts = ['active' => 'boolean', 'featured' => 'boolean', 'track_stock' => 'boolean', 'base_price' => 'decimal:2', 'sale_price' => 'decimal:2', 'tax_rate' => 'decimal:2'];

    public function isOnSale(): bool
    {
        return $this->sale_price !== null && (float)$this->sale_price < (float)$this->base_price;
    }

    public function getEffectivePriceAttribute(): float
    {
        return $this->isOnSale() ? (float)$this->sale_price : (float)$this->base_price;
    }

    public function category(): BelongsTo
    {
        return $this->belongsTo(Category::class);
    }

    public function images(): HasMany
    {
        return $this->hasMany(ProductImage::class)->orderBy('sort_order');
    }

    public function variants(): HasMany
    {
        return $this->hasMany(ProductVariant::class);
    }

    /** Effektiver Bruttopreis (Basispreis, wenn keine Variante gewählt) */
    public function getDisplayPriceAttribute(): float
    {
        return (float) $this->base_price;
    }

    public function getNetPriceAttribute(): float
    {
        return round($this->base_price / (1 + $this->tax_rate / 100), 2);
    }
}