app-api/app/Models/TravelImage/TravelInfo.php

<?php

namespace App\Models\TravelImage;

use Illuminate\Database\Eloquent\Model;

class TravelInfo extends Model{
//    protected $connection = 'mysql_szy';
    protected $table='travel_info';

    public function get_img(){
        return $this->hasMany(TravelImage::class,'travel_id');
    }
}