[PHP] laravel-admin select框默认选中的方法

protected function form()
{
  return Admin::form(Member::class, function (Form $form) {
 
  // $form->display('id', 'ID');
  $form->text('mac', '终端mac');
  $form->text('phone', '手机号');
  $form->text('password', '密码');
  //判断是不是edit
  $id = Request::route('member');
  $place_id ='';
  $rule_id = '';
  if ($id)
  {
    $model = $form->model()->find($id);
    $place_id = $model->place_id;
    $rule_id = $model->rule_id;
  }
  $form->select('place_id','所属场所')->options("/api/getPlace/$place_id");
  $form->select('rule_id', '规则')->options("/api/getRule/$rule_id");
  });
}
 
//api的实现
public function getPlace(Request $request)
{
  $name = $request->get('p');
  $id = $request->id;
  $where = [];
  if ($name)
  {
  $where = ['name','like',"%$name%"];
  }
  $places = Place::where($where)->get();
  $result = [];
  foreach ($places as $key=>$value)
  {
  $result[$key]['id'] = $value->Id;
  $result[$key]['text'] = $value->name;
  if ($value->Id == $id)
  {
    $result[$key]['selected'] = true;
  }
  }
  if (!$id)
  {
    array_unshift($result,['id'=>' ','text'=>'请选择场所','selected'=>true]);
  }else{
    array_unshift($result,['id'=>' ','text'=>'请选择场所']);
  }
  return response()->json($result);
}