拉瓦维尔和哪里不存在

这是我的问题;

SELECT * FROM digital_cases WHERE name LIKE $request->name . '%' 
AND added_by IN (SELECT id FROM assistants WHERE firstname LIKE $request->addedBy . '%');

我试过了:

$digital_cases = DB::table('digital_cases');

if ($request->has('caseName')) {
    $digital_cases = $digital_cases->where('name', 'LIKE', $request->caseName . '%');
    if ($request->has('addedBy')) {
        $addedBy = $request->addedBy;
        $digital_cases = $digital_cases->andWhere('added_by', 'IN', function ($digital_cases) use ($addedBy) {
            DB::table('assistants')->select('id')->whereIn('firstname', 'LIKE', $addedBy . '%');
        });
    }
}


$digital_cases = $digital_cases->get();

我删除了之前的问题是错误的,但现在一切似乎都好。但我犯了个错误:

方法illumed\database\query\builder::andwhere不存在。