Question

据我了解，我正在调用一个同步函数“ httpGet”，该函数应该返回一个promise。该功能似乎正在工作，因为它已成功通过console.log语句从Airtable中获取了我的所有数据，但是我在.then（）方法中得到了任何响应。

在这里我称之为“ httpGet”函数：

async handle(handlerInput) {
    let speechText = '';
    console.log('Going to fetch Airtable data');
    await httpGet(base).then((response) => {
      console.log('have promise')    
    }).catch((err) => {
      //set an optional error message here
      console.log('do not have promise')
      //speechText = 'there is an error ' + err.message;
    }); 
    speechText = `Container ID ` + contID + ` is a ` + bincolor + `, ` + gallons + ` located in ` + binloc ;        

    console.log('speechText = ' + speechText);

    return handlerInput.responseBuilder
      .speak(speechText)
      .reprompt(speechText)
      .withSimpleCard('Warehouse Inventory', speechText)
      .getResponse();
};

这是被调用的httpGet函数：

async function httpGet(options) {
  // return new pending promise
  return new Promise((resolve, reject) => {    

        base('Bins').select({
          // Selecting a record in Grid view:
          maxRecords: 1,
          view: "Grid view"
        }).eachPage(function page(records, fetchNextPage) {
          // This function (`page`) will get called for each page of records.

          records.forEach(function(record) {
              console.log('Container ID: ', record.get('Container ID'));
              console.log('Gallons: ', record.get('Gallons'));        
              console.log('Bin Color: ', record.get('Color'));
              console.log('Location: ', record.get('Location'));        
              console.log('Imperfections: ', record.get('Imperfections'));
              var contID = record.get('Container ID');
              var gallons = record.get('Gallons');
              var bincolor = record.get('Color');
              var binloc = record.get('Location');
              var imper = record.get('Imperfections');

          });

          // To fetch the next page of records, call `fetchNextPage`.
          // If there are more records, `page` will get called again.
          // If there are no more records, `done` will get called.
          fetchNextPage();

      }, function done(err) {
          if (err) { 
            console.error(err); return; 
          }
      });    
  });
}

最终，我试图获取存储在变量contID，加仑，bincolor，binloc和imper中的值。我该如何完成？

Answer 1

在httpGet()中，执行resolve({ contID, gallons, /* ... */ })，然后在then((response) => {})中，您的response将成为带有contID，gallons等的对象。属性。请查看this blog post，以获取有关异步返回值的更多详细信息。

Answer 2

您的代码有太多嵌套，这是一种不好的做法。您无法从诺言中返回值，因为它是异步的，您可以在其中执行您想做的事情。

Factory

如何将一个诺言中的值返回给我的调用函数？

2 个答案: