Cheerio.load 与 Google Assistant 的响应相混淆答案

【问题标题】：Cheerio.load messes with responses for Google AssistantCheerio.load 与 Google Assistant 的响应相混淆
【发布时间】：2018-12-02 05:59:13
【问题描述】：

我有这个意图，它调用了cheerio.load() 并且它与响应混淆。谷歌助理一直告诉我没有设置响应，即使稍后在代码中我有响应。控制台还告诉我没有将异步调用返回给处理程序，我相信这是cheerio.load()。无论如何我可以解决这个问题，以便它继续在代码底部寻找正确的 conv.ask 吗？它仍然继续运行到那里，因为 console.log(map) 出现了。感谢您的帮助！

app.intent("late drop", (conv,{term,year}) => {
var date = new Date();
var month;
if(term == null){
    month = date.getMonth();

    if(month >= 9 && month <=12){
        term = "fall";
        //console.log("fall")
    }
    else if (month >= 1 && month <= 5) {
        term = "spring";
        //console.log("spring")
    }
    else {
        term = "summer";
        //console.log("summer")
    }
}
if(year == null){
    yearDig = date.getFullYear();
    year = yearDig;
    //console.log(year)
}
var strYear = year.toString();
var semester = term+strYear.substr(2);
const options = {
    uri: `https://www.registrar.psu.edu/academic_calendar/${semester}.cfm`,
    transform: function (body) {
        return cheerio.load(body);
  }
};
rp(options)
.then(($) => {
    let map = {};
    let columnOne = [];
    let columnThree = [];

    $('table').find('tr td:nth-child(1)').each(function (index, element) {
        columnOne.push($(element).text());
      });

    $('table').find('tr td:nth-child(3)').each(function (index, element) {
        columnThree.push($(element).text());
    });

    columnOne.forEach((item, i) => {
        map[item] = columnThree[i];
    });

    console.log(map);
    date = map["2Late Drop Begins"];
    conv.ask("The late drop period begins on " + map["2Late Drop Begins"])
})
.catch((error) => {
    console.log(error);
    conv.ask("An error occured, please try again.");
})

});

【问题讨论】：

标签： node.js promise dialogflow-es actions-on-google cheerio

【解决方案1】：

问题不在于cheerio。

您似乎正在使用request-promise 或request-promise-native 进行HTTP 调用。这将执行一个异步操作，该操作将返回一个 Promise（正如您使用 .then() 和 .catch() 所证明的那样。

由于执行异步操作的 Intent 处理程序必须返回一个 Promise，因此您可以简单地返回由 rp/then/catch 链返回的那个。像改变这条线这样的东西应该可以工作：

return rp(options)

【讨论】：

哇，原来如此，不敢相信我没想到。谢谢！
很容易错过！

【解决方案2】：

我已修改您的代码以返回 Promise。检查这是否适合您。

app.intent("late drop", (conv, {
  term,
  year
}) => {

  return new Promise(function (resolve, reject) {

    var date = new Date();
    var month;
    if (term == null) {
      month = date.getMonth();

      if (month >= 9 && month <= 12) {
        term = "fall";
        //console.log("fall")
      } else if (month >= 1 && month <= 5) {
        term = "spring";
        //console.log("spring")
      } else {
        term = "summer";
        //console.log("summer")
      }
    }
    if (year == null) {
      yearDig = date.getFullYear();
      year = yearDig;
      //console.log(year)
    }
    var strYear = year.toString();
    var semester = term + strYear.substr(2);
    const options = {
      uri: `https://www.registrar.psu.edu/academic_calendar/${semester}.cfm`,
      transform: function (body) {
        return cheerio.load(body);
      }
    };
    rp(options)
      .then(($) => {
        let map = {};
        let columnOne = [];
        let columnThree = [];

        $('table').find('tr td:nth-child(1)').each(function (index, element) {
          columnOne.push($(element).text());
        });

        $('table').find('tr td:nth-child(3)').each(function (index, element) {
          columnThree.push($(element).text());
        });

        columnOne.forEach((item, i) => {
          map[item] = columnThree[i];
        });

        console.log(map);
        date = map["2Late Drop Begins"];
        conv.ask("The late drop period begins on " + map["2Late Drop Begins"])
        resolve()
      })
      .catch((error) => {
        console.log(error);
        conv.ask("An error occured, please try again.");
        reject()
      })
  });

});

希望有帮助！

【讨论】：