public function store(Request $request, $lecture_id, $subject_id)
{
$subject = Subject::find($subject_id);
$assignment = new Assignment();
$assignment->due_date = $request->due_date . ' 23:59';
$assignment->subject()->associate($subject);
$assignment->save();
$assignment->knowledgeunits()->attach(Input::get('knowledgeunits'));
return redirect('/lectures/' . $lecture_id . '/assignments/subjects/' . $subject_id);
}
