sam-api/app/Models/Quote/QuoteItem.php

<?php

namespace App\Models\Quote;

use App\Traits\BelongsToTenant;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

class QuoteItem extends Model
{
    use BelongsToTenant, HasFactory;

    protected $fillable = [
        'quote_id',
        'tenant_id',
        // 품목 정보
        'item_id',
        'item_type',
        'item_code',
        'item_name',
        'specification',
        'unit',
        // 수량/금액
        'base_quantity',
        'calculated_quantity',
        'unit_price',
        'total_price',
        // 수식 정보
        'formula',
        'formula_result',
        'formula_source',
        'formula_category',
        'data_source',
        // 기타
        'delivery_date',
        'note',
        'sort_order',
    ];

    protected $casts = [
        'base_quantity' => 'decimal:4',
        'calculated_quantity' => 'decimal:4',
        'unit_price' => 'decimal:2',
        'total_price' => 'decimal:2',
        'delivery_date' => 'date',
        'created_at' => 'datetime',
        'updated_at' => 'datetime',
    ];

    /**
     * 견적 마스터
     */
    public function quote(): BelongsTo
    {
        return $this->belongsTo(Quote::class);
    }

    /**
     * 금액 계산 (수량 × 단가)
     */
    public function calculateTotalPrice(): float
    {
        return round($this->calculated_quantity * $this->unit_price, 2);
    }

    /**
     * 금액 업데이트 후 저장
     */
    public function updateTotalPrice(): self
    {
        $this->total_price = $this->calculateTotalPrice();

        return $this;
    }
}