“with”无法在Laravel5中加入查询？

I have two types of queries with me,

$quotations = Quotation::join('clients as c', 'c.id', '=', 'client_id')
            ->with("client", "items", "salesPerson")
            ->orderBy('quotation_date', 'desc')
            ->paginate(5);

and

$quotations = Quotation::with("items","salesPerson","client")->paginate(100)

In first case,result not including "clients","items" and "salespPerson".

but in second case,result includes all above item.

Is there any error in my approach?

I can not use second one because id doesn't support orderby with related model. When I am using first one,Related objects are NULL.