Question

我遇到了Promise的问题。我没有得到答案，因为异步。好吧，我认为这就是问题所在，因为当我运行代码时，我没有收到任何错误，但我也没有得到任何答案。

这是我的代码

'use strict'

import validator from "validator"
import cassandra from "./cassandra";
import timezone from "./timezone"
import requestRace from "./request"

exports.getUser = (req, res)  =>  {
  const getHistory =  `SELECT inscriptionid,first_name,created,lastupdate,number,eventraceid ` +
                      `FROM inscription_data ` +
                      `WHERE userid = ${req.params.idUser} ` +
                    //  `AND number IS NOT NULL ` +
                      `ALLOW FILTERING`;
  if(req.params && validator.isUUID(req.params.idUser))  {
    cassandra.execute(getHistory)
      .then(ans  => {
          requestRace(timezone(ans.rows))
            .then(aws => console.log("hola"))
            .catch(err => console.log("error: ", err))
      })
      .catch(err => res.status(500).json({code: 500,data:{error: true,message: err}}))
  }
}

和另一个

'use strict'

import axios from "axios"

const route = `https://ms.***.com/v1/races/`

function requestRace(params)  {
  var newArr = new Array(), newObj = {}, hola
  params.map(obj => {
    axios.get(`${route}${obj['eventraceid']}?apikey=pub_nLbIjlCWNKAdB_O3qgTaoQ`)
      .then(res => {
        newArr.push(creaJSON(obj, res.data))
    //    console.log("New:", newArr)
      })
      .catch(err => console.log("error: ", err))
  })
 return newArr.then(ho => {return ho} )
}

function creaJSON(obj,subojb) {
  obj['race'] = subojb[`data`]
  return obj
}


module.exports = requestRace

如果有人能看到我的错误，我会很感激，如果你能解释我的错误在哪里以及为什么

非常感谢你提前

Answer 1

要解决我的问题，我必须使用async / await。这是它结束的方式

'use strict'

import validator from "validator"
import cassandra from "./cassandra";
import timezone from "./timezone"
import requestRace from "./request"

exports.getUser = (req, res)  =>  {
  const getHistory =  `SELECT inscriptionid,first_name,created,lastupdate,number,eventraceid ` +
                      `FROM inscription_data ` +
                      `WHERE userid = ${req.params.idUser} ` +
                      `AND number IS NOT NULL ` +
                      `ALLOW FILTERING`;
  if(req.params && validator.isUUID(req.params.idUser))  {
    cassandra.execute(getHistory)
      .then(ans  => {
          requestRace(timezone(ans.rows))
            .then(aws => res.status(200).json({code:200, data:aws}))
            .catch(err => console.log("error: ", err))
      })
      .catch(err => res.status(500).json({code: 500,data:{error: true,message: err}}))
  }
}

＆＃39;使用严格的＆＃39;

import axios from "axios"

const route = `http://***/v1/inscription/`

async function requestRace(params)  {
    var newArr = new Array(), newObj = {}
    for(let p in params)  {
      await axios.get(`${route}${params[p]['inscriptionid']}?apikey=pub_nLbIjlCWNKAdB_O3qgTaoQ`)
        .then(res => {
          newArr.push(creaJSON(params[p], res.data))
        }).then(ok => {return ok})
        .catch(err => console.log("error: ", err))
    }

  return newArr
}

function creaJSON(obj,subojb) {
  obj['race'] = subojb[`data`]
  return obj
}


module.exports = requestRace

承诺中的异步问题

1 个答案: