当字段格式是object时，怎么验证必填呢 about ncform HOT 1 CLOSED

{
  "type": "object",
  "properties": {
    "user": {
      "type": "object",
      "ui": {
        "widget": "input",
        "widgetConfig": {
          "modelField": "name",
          "compound": {
            "prependSelect": {
              "itemLabelField": "label",
              "itemValueField": "value",
              "enumSource": [
                {
                  "value": 1,
                  "label": "男"
                },
                {
                  "value": 2,
                  "label": "女"
                }
              ],
              "modelField": "gender"
            }
          }
        }
      },
      "rules": {
        "required": true,
        "customRule": [
          {
            "script": "dx: {{$root.user}}.name",
            "errMsg": "名字必填"
          }
        ]
      }
    }
  }
}