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我的数据库中有 2 个包含城市和州的表，如果我要提交城市，那么我想将 state_id 保存在我的城市表中。城市表的主键是 ctId 城市表的主键是 stId

这是我的状态模型... State.php 文件

<?php

namespace App;
use App\City;

use Illuminate\Database\Eloquent\Model;

class State extends Model
 {
protected $primaryKey = 'stId';
// protected $gaurded = [];
public function cities(){
    return $this->hasMany(City::class,'ctId','ctId');
 }
 }

这是我的城市模型... City.php 文件

<?php

namespace App;
use Illuminate\Database\Eloquent\Model;
use App\State;
class City extends Model
{

protected $primaryKey = 'ctId';
protected $gaurded = [];

public function state(){
    return $this->belongsTo(State::class);
}
}

这是我的 CityController.php

    public function store(Request $r){
    //dd($r->all());
    $cities=new City;
    $cities->name=$r->cityname;
    $cities->slug=$r->cityslug;
    $cities->save();
    $this->return()->back();
}

但是当我提交这个时，我收到了这个错误

SQLSTATE[HY000]: General error: 1364 Field 'stId' doesn't have a default value
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