我正在尝试实现一个对话流电子书以连接到 wordpress api，但出现错误：没有为平台定义响应：null

Question

Here is my code. How can I configure it to return a response for the Google Assistant integration? I would like to use this code within the Dialogflow in-line code editor or deploy it to firebase functions.

process.env.DEBUG = 'dialogflow:debug'; // enables lib debugging statements

exports.dialogflowFirebaseFulfillment = functions.https.onRequest((request, response) => {
    const agent = new WebhookClient({ request, response });
    console.log('Dialogflow Request headers: ' + JSON.stringify(request.headers));
    console.log('Dialogflow Request body: ' + JSON.stringify(request.body));



    function getProjects(agent){
        const api = 'https://playhacker.com/wp-json/wp/v2';
        const tag = agent.parameters.tag;
        //let url = `${api}/posts?tags=${tag}&_embed`;


        let getPosts = (tag, callback) => {
            let url = `${api}/posts?tags=${tag}&_embed`;
            request({url}, (err, res, body) => {
                if (err) {
                    callback('Sorry, there was an error getting posts from our blog', err);
                    return;
                } else {
                    let posts = JSON.parse(body);
                    if (posts.length === 0) {
                        callback(`It does not seem like there is any content available on this topic`);
                        return;
                    } else {
                        let formattedPosts = posts.map((post) => {

                            return {
                                "payload": {
                                    "google": {
                                        "expectUserResponse": true,
                                        "richResponse": {
                                            "items": [
                                                {
                                                    "simpleResponse": {
                                                        "textToSpeech": "Here is a project we found for you"
                                                    }
                                                },
                                                {
                                                    "basicCard": {
                                                        "title": post.title.rendered,
                                                        "subtitle": "Project",
                                                        "formattedText": post.excerpt.rendered.replace(/<(?:.|\\n)*?>/gm, '').replace(/&[^\\s]*/, ''),
                                                        "image": {
                                                            "url": post._embedded['wp:featuredmedia'][0].media_details.sizes.listing.source_url,
                                                            "accessibilityText": "featured image"
                                                        },
                                                        "buttons": [
                                                            {
                                                                "title": "Read more",
                                                                "openUrlAction": {
                                                                    "url": post.link
                                                                }
                                                            }
                                                        ],
                                                        "imageDisplayOptions": "CROPPED"
                                                    }
                                                }
                                            ]
                                        }
                                    }
                                }
                            };
                        });

                        formattedPosts.unshift({
                            type: 0,
                            platform: 'google',
                            speech: 'Sure, here are some helpful projects'
                        });

                        callback(undefined, formattedPosts);
                        return;
                    }
                }
            });
        };


    }

    let intentMap = new Map();

    intentMap.set('getProjects',getProjects);
    agent.handleRequest(intentMap);
});

When I run it in Dialogflow in-line editor, I got this error:

{
 insertId: "000001-ec48afd6-c286-47e4-8c75-43a2c6f1fc08"  
 labels: {…}  
 logName: "projects/apologetic-robot-fiajxe/logs/cloudfunctions.googleapis.com%2Fcloud-functions"  
 receiveTimestamp: "2020-05-03T06:38:00.862369842Z"  
 resource: {
  labels: {…}   
  type: "cloud_function"   
 }
 severity: "ERROR"  
 textPayload: "Error: No responses defined for platform: null
    at V2Agent.sendResponses_ (/srv/node_modules/dialogflow-fulfillment/src/v2-agent.js:243:13)
    at WebhookClient.send_ (/srv/node_modules/dialogflow-fulfillment/src/dialogflow-fulfillment.js:505:17)
    at promise.then (/srv/node_modules/dialogflow-fulfillment/src/dialogflow-fulfillment.js:316:38)
    at <anonymous>
    at process._tickDomainCallback (internal/process/next_tick.js:229:7)"  
 timestamp: "2020-05-03T06:37:59.833Z"  
 trace: "projects/apologetic-robot-fiajxe/traces/29d9241c46088463269b00ecf3558974"  
}

Answer 1

The error Error: No responses defined means you haven't defined any response to be sent to dialogflow that can be shown back to the chatbot user.

For eg. when the codeflow reaches the function getProjects , there should be a response back to dialogflow before returning from the function, anything like

agent.add(`There seems to be some error`);

which will in turn show this string back to the user.

Additonally, in your above example, I cannot see your getPosts function being called anywhere.