public function add(Request $request)
{
//
$item = new Item();
$object_name = ucwords($request->input('object_type'));
$object_id = $request->input('object_id');
$object = $object_name::find($object_id);
$item->object()->associate($object);
$item->key = $request->input('key');
$item->value = $request->input('value');
$item->name = $request->input('name');
$item->save();
return redirect()->back()->with('message_content', '添加成功!')->with('message_type', 'info');
}
