IOTHubMessage.forEach不是函数吗?

问题描述

有人可以告诉我如何解析此问题吗?

Can anyone tell me how to parse this problem?

我有一条抛出的错误消息，即当我创建天蓝色的cosmossDB时，我的cosmosDB输出绑定抛出的消息是IOTHubMessage.forEach不是函数；

I have an thrown error message that when i create azure cosmossDB, my cosmosDB output binding thrown message that IOTHubMessage.forEach is not a function;

module.exports = function (context, IoTHubMessages) {
    context.log(`JavaScript eventhub trigger function called for message array: ${IoTHubMessages}`);

    var count = 0;
    var totalTemperature = 0.0;
    var totalHumidity = 0.0;
    var deviceId = "*****";

    IoTHubMessages.forEach(message => {
        context.log(`Processed message: ${message}`);
        count++;
        totalTemperature += message.temperature;
        totalHumidity += message.humidity;
        deviceId = message.deviceId;
    });

    var output = {
        "deviceId": deviceId,
        "measurementsCount": count,
        "averageTemperature": totalTemperature / count,
        "averageHumidity": totalHumidity / count
    };

    context.log('Output content: ${output}');
    context.bindings.outputDocument = output;


    context.done();
};

我想念什么?请协助，谢谢.

What am i missing? Please assist, thanks.

推荐答案

它没有包含在您的答案中，但是问题很可能出现在您的functions.json文件中.默认情况下，IoTHub的绑定一次只能处理一条消息.这意味着您的IoTHubMessages不是数组，而是单个对象.您需要将基数从一个更改为许多.

It wasn't included in your answer, but the issue is most likely in your functions.json file. The bindings for IoTHub by default only handle one message at a time. This means that your IoTHubMessages isn't an array, but a single object. You need to change cardinality from one to many.

要更改此设置，请编辑functions.json文件以包含基数属性.

To change this, edit your functions.json file to include a cardinality property.

{
  "type": "eventHubTrigger",
  "name": "eventHubMessages",
  "direction": "in",
  "eventHubName": "MyEventHub",
  "cardinality": "many",
  "connection": "myEventHubReadConnectionAppSetting"
}

如果您在门户网站中创建了此功能，则可以在该功能的 Integration 部分中更改绑定的基数:

In case you made this function in the portal, you can change the cardinality of the binding in the Integrate part of the function:

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