下載插件 mongoose

代碼如下：

router.get("/navigation", async (req, res) => {
  let list = await navigationModel.find().lean()
  let listobj = {}
  list.forEach(item => {
    listobj[item._id] = item
  })
  let data = []
  list.forEach(item => {
    if (!item['nid']) {
      data.push(item)
    } else {
      if (!listobj[item["nid"]]["children"]) {
        listobj[item["nid"]]["children"] = []
      }
      listobj[item["nid"]]["children"].push(item)
    }
  })
  res.send({
    data,
    code: 200,
    msg: "請求成功"
  })
})

實現效果：

?