如何在 dgraph 查询中获取子字符串答案

【问题标题】：How to get a substring in dgraph query如何在 dgraph 查询中获取子字符串
【发布时间】：2020-11-06 18:15:05
【问题描述】：

当我执行这个查询时

{
  message (func: uid(0x4e22)) {
    message
  }
}

我收到回复

{
  "data": {
    "message": [
      {
        "message": "really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message really long message "
      }
    ]
  },
  ...
}

但我希望我返回的数据具有message 的缩短预览版，类似于以下内容

        "message": "really long message rea"

在 dgraph 查询语言中有没有办法返回这样的子字符串？

【问题讨论】：

标签： graphql dgraph

【解决方案1】：

目前没有。使用即将推出的 @lambda 指令和 javascript 挂钩函数，您可以拥有这些功能。 20.11 版预计将于 2020 年 11 月上旬发布。

【讨论】：