x-server-mobile/backend/app/model/BusinessTripItinerary.php

<?php

namespace app\model;

use support\Model;

class BusinessTripItinerary extends Model
{
    protected $table = 'business_trip_itinerary';

    protected $fillable = [
        'business_trip_id',
        'start_time',
        'end_time',
        'departure',
        'destination',
        'transport',
        'trip_type',
        'remark',
    ];

    protected $casts = [
        'business_trip_id' => 'integer',
        'start_time' => 'datetime',
        'end_time' => 'datetime',
        'created_at' => 'datetime',
        'updated_at' => 'datetime',
    ];

    /**
     * 行程类型常量
     */
    const TRIP_TYPE_ONEWAY = 'oneway';     // 单程
    const TRIP_TYPE_ROUNDTRIP = 'roundtrip'; // 往返

    /**
     * 关联出差申请
     */
    public function businessTrip()
    {
        return $this->belongsTo(BusinessTrip::class, 'business_trip_id');
    }

    /**
     * 计算天数
     */
    public function getDurationDays(): int
    {
        if (!$this->start_time || !$this->end_time) {
            return 0;
        }
        $start = \DateTime::createFromFormat('Y-m-d H:i:s', $this->start_time);
        $end = \DateTime::createFromFormat('Y-m-d H:i:s', $this->end_time);
        if (!$start || !$end) {
            return 0;
        }
        return $end->diff($start)->days + 1;
    }
}