nl-mall-api/app/Models/ProductModel.php

<?php

namespace App\Models;

use App\BaseApp\BaseModel;
use Illuminate\Database\Eloquent\Relations\HasMany;

class ProductModel extends BaseModel
{

    protected $table = 'product';
    /**
     * The attributes that are mass assignable.
     *
     * @var list<string>
     */
    protected $guarded = [];

    public function images(): HasMany
    {
        return $this->hasMany(ProductImageModel::class, 'product_id', 'id');
    }

    public function mall()
    {
        return $this->hasOne(MallModel::class, 'id', 'mall_id');
    }

    public function user()
    {
        return $this->hasOne(AdminModel::class, 'id', 'user_id');
    }

    public function labels()
    {
//        return $this->hasMany(ProductLabelRelationsModel::class, 'product_id', 'id');
        return $this->belongsToMany(ProductLabelModel::class, 'product_label_relations', 'product_id', 'label_id');
    }

    public function classification()
    {
        return $this->hasOne(ProductClassificationModel::class, 'id', 'classification_id');
    }

    public function skus()
    {
        return $this->hasMany(SkuModel::class, 'product_id', 'id');
    }
}