大家好,

我create了user , dept 兩個table
下面是兩個model:

namespace App;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Foundation\Auth\User as Authenticatable;
use Spatie\Permission\Models\Role;
use Spatie\Permission\Models\Permission;
use Spatie\Permission\Traits\HasRoles;

use Laravel\Passport\HasApiTokens;

class User extends Authenticatable
{

	//use AuthenticableTrait;
    //
	use HasRoles;
	use HasApiTokens; 
	
	public $table = "user";
	
	protected $keyType = 'string';
	
	public $timestamps = false;
	
	protected $fillable = [
		'id', 'email', 'name_en', 'name_tc',
		'name_zh', 'role_id', 'dept_id', 
		'shop_id', 'remember_token', 'created_at', 'updated_at'
	];
	
	protected $hidden = [
		'password', 'remember_token'
	];
	
	public function getNameEnAttribute($value)
    {
        return $value;
    }
	
	public function setNameEnAttribute($value)
    {
        $this->attributes['name_en'] = "username_en";
    }
	
	public function role()
    {
        return $this->hasOne('App\Roles', 'id');
    }
	
	public function shop()
    {
        return $this->hasOne('App\Shop', 'id');
    }
	
	public function dept()
    {
        return $this->hasOne('App\Dept', 'id', 'dept_id');
    }
	
	public function orderitem()
    {
        return $this->hasMany('App\OrderItem', 'id');
    }
	
	/* return $this->belongsToMany('App\role'); */
	
}

namespace App;

use Illuminate\Database\Eloquent\Model;

class Dept extends Model
{
    //
	protected $table = "dept";
	
	protected $fillable = [
		'id', 'name_en', 'name_tc', 'name_zh', 
		'created_at', 'updated_at'
	];
	
	public function user()
    {
		// set back many to one relationship with user model
        return $this->hasOne('App\Dept', 'user_dept_id', 'dept_id');
    }
	
	public function role()
    {
        return $this->hasMany('App\Item');
    }
}

不知道設定得有沒有錯
user 和 dept 的relationship 是 user hasone department, department hasMany user

但是當我用這句
User::with('dept')->where("id", Auth::user()->id)->get();

返回的json 是這樣...
{"status":"success","data":[{"id":"1","email":"admin@tuta.pos","name_en":"admin","name_tc":"\u7ba1\u7406\u54e1","name_zh":"\u7ba1\u7406\u54e1","role_id":"1","dept_id":"k02","shop_id":"1","created_at":"2020-07-14 07:23:58","updated_at":"2020-07-14 07:23:58","dept":null}]}

dept 出了null, 請問是我的user-dept 的關係錯嗎?