where query on relationship laravel code example

Example 1: laravel where condition on relationship

App\Request::where('id',4)
    ->whereHas('quotes', function ($query) {
        $query->where('status','=','3');
    })
    ->with('quotes','sourceTable','destinationTable')
    ->get();

Example 2: where query from relation table in laravel

UserModel::whereHas('attachments', function ($attachmentQuery) {
    $attachmentQuery->where('level', 'profile_level');
})->get();
If you want from already queried model get specific attachments then write

$userModel->attachments()->where('level', 'profile_level')->get();

it is impossible to query both UserModel and AttachementModel in single query,
it must be at least two queries. Even fancy 
  UserModel::with('attachments')->get();, 
which returns user with all attachments, do internally two queries.

OR:

I noticed that you can define relation constraints within with method

UserModel::with(['attachments' => function ($attachmentQuery) {
    $attachmentQuery->where('level', 'profile_level');
}])->get();