将数据存储在 Laravel 控制器中的 2 个不同表中

Store data in 2 different tables in Laravel Controller

请问有什么帮助吗!我正在尝试与可以访问该业务的企业和用户建立一个系统。用户与DB中的业务相关联,有一个名为'id_business'的列,这是该用户可以管理的业务的id。首先,我创建用户并将 'id_business' 的值默认设置为 0。然后当我创建新业务时,我设置业务名称并从下拉列表中设置(用户值为 'id_business=0') 我为这项业务选择用户。现在我的问题是,我如何以一种形式存储新业务并在用户 table 中设置 'id_business' 的值,就像我刚刚创建的新业务的 ID。我从这个列表中获取用户:

<select name="id_business" class="form-control input-xlg">
 <option value="">Select User </option>
 @foreach($users as $user)
 <option value="{{$user->id}}">{{$user->name}}</option>
 @endforeach
</select>

在我的控制器中我已经走了这么远,但它不工作:

public function store(Request $request)
{

    $businesses = new Businesses();
    $businesses->name = $request->name;
    $businesses->user_create_id = Auth::user()->id;

    $user= Businesses_Users::first();

    if($businesses->save())
    {
        $request->id_business;
        $user->id = Businesses_Users::find($request->id_business);

        $user->id_business = $businesses->id;


        return redirect()->route('businesses',$businesses->id)->with('success', sprintf('Business successfully created.'));
    }
    else
    {
        return redirect()->back()->with('error', sprintf('An unexpected error occurred.Please fill a report form on this issue.'));
    }

}

提前致谢。

缺少 save() 函数

$user = Businesses_Users::find($request->id_business); 
$user->id_business = $businesses->id;
$user->save();