baoshi-was/app/Station.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Station extends Model
{
    protected $fillable=['name', 'code', 'station_type_id','sequence','parent_id'];

    function type(){
        return $this->belongsTo(StationType::class);
    }
    function parent(){
        return $this->belongsTo(Station::class,'parent_id','id');
    }
}