public function allWords()
{
$group = Input::get('group_id');
if ($group == null) {
return Word::all();
} else {
if (is_array($group)) {
$groups = JsonController::array_to_sql_list($group);
return Word::whereRaw("group_id in {$groups}")->get();
}
return Word::where('group_id', '=', $group)->get();
}
}