public function postEditField($id, $field)
 {
     if (!array_key_exists($field, Team::$rulesAll)) {
         \App::abort(403, 'Unauthorized action.');
     }
     $team = Team::find($id);
     if ($team === null) {
         return redirect('teams')->withError(trans('app.teamNotExists', ['id' => $id]));
     }
     $validator = Team::validate(Input::all(), $field);
     if ($validator->fails()) {
         return redirect()->route('team.edit', $team->id)->withErrors($validator->messages()->all());
     }
     $team->{$field} = Input::get($field);
     $team->save();
     return redirect()->route('team.edit', $team->id)->with('success', trans('app.updateSuccessful'));
 }