AWS-无法读取未定义的属性“用户名”

Question

我遇到了一个错误：无法读取未定义的属性'username'，而且const用户名会说它未被使用。

完全错误：

Response:
{
  "errorType": "TypeError",
  "errorMessage": "Cannot read property 'username' of undefined",
  "trace": [
    "TypeError: Cannot read property 'username' of undefined",
    "    at Runtime.exports.handler (/var/task/index.js:7:50)",
    "    at Runtime.handleOnce (/var/runtime/Runtime.js:66:25)"
  ]
}

代码：

exports.handler = (event, context, callback) => {    
    console.log(event);
    const connectionId = event.requestContext.connectionId;
    const username = event.queryStringParameters.username;
    addConnectionId(connectionId).then(() => {    
        callback(null, {        
            statusCode: 200,       
            });
    });};

function addConnectionId(connectionId) {
    const params = {
        TableName: 'Chat',
        Item: {
            'connection_id' : connectionId,
            'username' : username
        }
    };
    return ddb.put(params).promise();
}

Answer 1

您需要启用Use Lambda Proxy integration才能访问查询参数。