sam-api/app/Models/Products/ProductComponent.php

<?php

namespace App\Models\Products;

use App\Models\Materials\Material;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;
use App\Traits\ModelTrait;
use App\Traits\BelongsToTenant;

class ProductComponent extends Model
{
    use SoftDeletes, ModelTrait, BelongsToTenant;

    protected $table = 'product_components';

    protected $fillable = [
        'tenant_id',
        'parent_product_id',
        'category_id',
        'category_name',
        'ref_type',
        'ref_id',
        'quantity',
        'sort_order',
        'created_by',
        'updated_by',
    ];

    protected $casts = [
        'quantity'   => 'decimal:6',
        'created_at' => 'datetime',
        'updated_at' => 'datetime',
        'deleted_at' => 'datetime',
    ];

    protected $hidden = [
        'deleted_at',
    ];

    /**
     * 상위 제품 (모델/제품)
     */
    public function parentProduct()
    {
        return $this->belongsTo(Product::class, 'parent_product_id');
    }

    /**
     * 참조된 제품 또는 자재를 동적으로 가져오기
     * ref_type에 따라 Product 또는 Material을 반환
     */
    public function referencedItem()
    {
        if ($this->ref_type === 'PRODUCT') {
            return $this->belongsTo(Product::class, 'ref_id');
        } elseif ($this->ref_type === 'MATERIAL') {
            return $this->belongsTo(Material::class, 'ref_id');
        }
        return null;
    }

    /**
     * 하위 제품 (ref_type = PRODUCT일 때만)
     */
    public function product()
    {
        return $this->belongsTo(Product::class, 'ref_id')
            ->where('ref_type', 'PRODUCT');
    }

    /**
     * 하위 자재 (ref_type = MATERIAL일 때만)
     */
    public function material()
    {
        return $this->belongsTo(Material::class, 'ref_id')
            ->where('ref_type', 'MATERIAL');
    }

    // ---------------------------------------------------
    // 🔎 Query Scopes
    // ---------------------------------------------------

    /**
     * 제품 BOM 아이템만
     */
    public function scopeProducts($query)
    {
        return $query->where('ref_type', 'PRODUCT');
    }

    /**
     * 자재 BOM 아이템만
     */
    public function scopeMaterials($query)
    {
        return $query->where('ref_type', 'MATERIAL');
    }

    /**
     * 특정 상위 제품의 BOM
     */
    public function scopeForParent($query, int $parentProductId)
    {
        return $query->where('parent_product_id', $parentProductId);
    }
}