Question

所以我试图非常简单地从Firebase数据库中读取和更新数据，它给了我一个错误。

“错误：无法处理请求”

我按照说明从Google的tutorial初始化我的应用我按照建议firebase deploy --only functions部署我的方法我收到以下回复：

i  deploying functions
i  functions: ensuring necessary APIs are enabled...
✔  functions: all necessary APIs are enabled
i  functions: preparing functions directory for uploading...
i  functions: packaged functions (63.07 KB) for uploading
✔  functions: functions folder uploaded successfully
i  functions: current functions in project: addMessage, helloWorld, now, weather, weather2
i  functions: uploading functions in project: weather
i  functions: updating function weather...
✔  functions[weather]: Successful update operation.
Function URL (weather): https://us-central1-*****.cloudfunctions.net/weather

有趣的是，他们的示例方法“addMessage”工作正常：

// Take the text parameter passed to this HTTP endpoint and insert it into the
// Realtime Database under the path /messages/:pushId/original
exports.addMessage = functions.https.onRequest((req, res) => {
  // Grab the text parameter.
  const original = req.query.text;
  // Push the new message into the Realtime Database using the Firebase Admin SDK.
  admin.database().ref('/messages').push({original: original}).then(snapshot => {
    // Redirect with 303 SEE OTHER to the URL of the pushed object in the Firebase console.
    res.redirect(303, snapshot.ref);
  });
});

但是，当我尝试使用此tutorial来更新数据而不是推送数据时，我会遇到问题。我非常感谢任何有关此问题的帮助，我已经在这工作了几个小时。< / p>

我的数据结构如何：

- 我的代码：

exports.weather = functions.https.onRequest((request, response) => {
  admin.database.ref('/weather').once('value').then(snapshot => {
    var temp = snapshot.child('temp').val();
    var time = snapshot.child("time").val()
    var diff = diff_minutes(Date().getTime(), time)
    //If the last request >=5 minutes, call DarkSky API & Update database
    if (diff >= 5) {
       var updates = {
          time: NEW_TIME,
          temp: NEW_TEMPERATURE
        }
        snapshot.update(updates)
        response.send(updates);
    }
     else {
      response.send(temp)
    }
  })
});

function diff_minutes(second_time, first_time) {
  var diff =(second_time - first_time) / (1000 * 60);
  return Math.abs(Math.round(diff));
}

有什么想法吗？

Answer 1

此代码更新数据库并发送响应不正确：

snapshot.update(updates);
response.send(updates);

snapshot是DataSnapshot的一个实例，没有update()方法。

将这两个陈述替换为：

snapshot.ref.update(updates).then(() => {
  response.send(updates);
}).catch(error => {
    console.error('Update failed:', error);
    response.send('Update failed'); // or some error status of your choice
});

此外：

将admin.database.ref更改为admin.database().ref

将Date().getTime()更改为Date.now()

Answer 2

以下是我使用Dark Sky API的最终代码（感谢所有帮助过的人！）：

此代码在HTTP请求中检查最后一次API调用Dark Sky API对特定位置的请求的时间，然后在最后5分钟内使用之前的结果，或者如果更长时间更新结果。

exports.weather = functions.https.onRequest((req, res) => {
  admin.database().ref('/weather').once('value').then(snapshot => {
      var temp = snapshot.child('temp').val();
      var time = snapshot.child("time").val();
      var diff = diff_minutes(Date.now(), time);
      var current = {
        time: time,
        temp: temp
      }
      if (diff >= 5) {
        DarkSkyApi.loadCurrent(position).then(result => {
          var updates = {
            time: result.time,
            temp: result.temperature
          }
          snapshot.ref.update(updates).then(() => {
            res.send(current);
          }).catch(error => {
              console.error('Update failed:', error);
              res.send('Update failed'); // or some error status of your choice
          });
        });
      }
      else {
        res.send(current);
      }
  });
});
    function diff_minutes(second_time, first_time) {
      var diff =(second_time - first_time) / (1000 * 60);
      return Math.abs(Math.round(diff));
    }

云功能无法访问Firebase数据库

2 个答案: