sfp_api_laravel_serprati/app/Models/StoreItemVariation.php

<?php

namespace App\Models;

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

class StoreItemVariation extends Model
{
    protected $fillable = [
        'store_item_id',
        'variation_type',
        'variation_label',
        'variation_value',
        'stock',
    ];

    protected function casts(): array
    {
        return [
            'variation_value' => 'float',
            'stock'           => 'integer',
        ];
    }

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