Lumen5.5 分表时，无法使用 updateOrCreate

我的业务需要分表，这是我的Model
MaterialExtend.php

<?php
/**
 * Created by PhpStorm. * User: 13018 * Date: 2019/12/24 * Time: 19:55 */
namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class MaterialExtend extends Model
{
  protected $connection = 'db_material_center';
  protected $table = '';
  protected $fillable = ['app_id','material_id','url','type','size','property'];

  public function setTable($table){  
      $this->table = $table;
  return $this;
  }
}

2,这是我的MaterialExtendRepository.php

<?php
namespace App\Repositories;

use App\Models\MaterialExtend;
use Illuminate\Support\Facades\Input;

class MaterialExtendRepository extends Repository
{
    private $table;
    private $prefix = 't_material_extend';
    private $app_id;
    private $materialExtend;
    private $fields = ['id','app_id','material_id','url','type','size','state','property'];

    public function __construct(){
        $app_id = Input::get('app_id');
        $this->app_id = $app_id;
        $this->table = $this->getTableName($app_id,$this->prefix);
        $this->materialExtend = (new MaterialExtend())->setTable($this->table);
    }
    public function setTable($app_id){
        $this->app_id = $app_id;
        $this->table = $this->getTableName($app_id,$this->prefix);
        $this->materialExtend = (new MaterialExtend())->setTable($this->table);
        return $this;
    }
    public function insert($data){
        return $this->materialExtend->insert($data);
    }
    public function updateOrCreate($where,$data){
        return $this->materialExtend->updateOrCreate($where,$data);
    }
}

3,然后我controller里面使用了依赖注入，DemoController.php
代码如下

public function updateOrCreate(Request $request,MaterialExtendRepository $materialExtend){
  $app_id = $request->input('app_id');
  $material_id = $request->input('material_id');
  $url = $request->input('url');
  $where = [
  'app_id' => $app_id,
  'material_id' => $material_id
  ];
  $material_extend_info['url'] = $url;
  $material_extend_info['size'] = 0;
  $material_extend_info['property'] = '';
  $material_extend_info['type'] = MaterialTypeEnum::PATCH_IMG;
  $materialExtend = $materialExtend->setTable($app_id);

  $data = array_merge($where,$material_extend_info);
  $table = $this->getTableName($app_id,'t_material_extend');
  $result = $materialExtend->insert($data);
  $result = $materialExtend->updateOrCreate($where,$material_extend_info);

  return ResponseBuilder::instance()->response();
}

能使用insert方法，不能使用updateOrCreate方法，insert时能正确根据app_id分表后插入数据库，但是updateOrCreate提示表不存在，table为空了，报错信息如下
SQLSTATE[42000]: Syntax error or access violation: 1103 Incorrect table name '' (SQL: insert into ` (app_id,material_id,url,size,property,type,updated_at,created_at`) values (appvr5gqdr56848, 1234, abc-3.mp4, 0, , 7, 2020-01-10 11:04:19, 2020-01-10 11:04:19))

数据库