javascript - 使用 Actions on Google 库集成时不显示轮播

Question

我正在尝试显示 carousel 从 Firebase 获取数据，Card 工作正常，但显示 Carousel 不起作用但让 conv = agent.conv();始终为空。但是我按照这里的说明进行操作:Using the Actions on Google library integration: .请不要生气，我正在努力学习。谢谢

'use strict';

const functions = require('firebase-functions');
const {WebhookClient, Card} = require('dialogflow-fulfillment');
const requestLib = require('request');
const {dialogflow, Carousel}= require('actions-on-google');
const app = dialogflow({debug: true});

// Constant for image URLs
const IMG_URL_AOG = 'https://developers.google.com/actions/images/badges' +
  '/XPM_BADGING_GoogleAssistant_VER.png';

// Constant for image URLs

const IMG_URL_GOOGLE_ALLO = 'https://allo.google.com/images/allo-logo.png';
const IMG_URL_GOOGLE_HOME = 'https://lh3.googleusercontent.com' +
  '/Nu3a6F80WfixUqf_ec_vgXy_c0-0r4VLJRXjVFF_X_CIilEu8B9fT35qyTEj_PEsKw';
const IMG_URL_GOOGLE_PIXEL = 'https://storage.googleapis.com/madebygoog/v1' +
  '/Pixel/Pixel_ColorPicker/Pixel_Device_Angled_Black-720w.png';
const IMG_URL_MEDIA = 'http://storage.googleapis.com/automotive-media/album_art.jpg';
const MEDIA_SOURCE = 'http://storage.googleapis.com/automotive-media/Jazz_In_Paris.mp3';

// initialise DB connection
const admin = require('firebase-admin');

admin.initializeApp({
  // credential:admin.credential.applicationDefault(),
   databaseURL:'ws://test-catWorldXXXXX.com/'
});

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 handelModel (agent){

    const chosenModel = agent.parameters["toyota-models"].toLowerCase();
    let conv = agent.conv();

    if (chosenModel == "corolla") {

        return admin.database().ref('corolla').once("value")
        .then(function(snapshot) {
        snapshot.forEach(function(model) {
        var value = model.val();
            agent.add("Nombre: " + value.nombre);
            Conv shows valor NULL...
            agent.add("conv " + conv); 

            conv.ask(new Carousel({
                items: {
                // Add the first item to the carousel
                [SELECTION_KEY_ONE]: {
      synonyms: [
        'synonym of title 1',
        'synonym of title 2',
        'synonym of title 3',
      ],
      title: 'Title of First Carousel Item',
      description: 'This is a description of a carousel item.',
      image: new Image({
        url: IMG_URL_AOG,
        alt: 'Image alternate text',
      }),
    },
                // Add the second item to the carousel
                [SELECTION_KEY_GOOGLE_HOME]: {
      synonyms: [
        'Google Home Assistant',
        'Assistant on the Google Home',
    ],
      title: 'Google Home',
      description: 'Google Home is a voice-activated speaker powered by ' +
        'the Google Assistant.',
      image: new Image({
        url: IMG_URL_GOOGLE_HOME,
        alt: 'Google Home',
      }),
    },
                // Add third item to the carousel
                [SELECTION_KEY_GOOGLE_PIXEL]: {
                synonyms: [
            'Google Pixel XL',
            'Pixel',
            'Pixel XL',
          ],
                title: 'Google Pixel',
                description: 'Pixel. Phone by Google.',
                image: new Image({
            url: IMG_URL_GOOGLE_PIXEL,
            alt: 'Google Pixel',
          }),
            },
                // Add last item of the carousel
                [SELECTION_KEY_GOOGLE_ALLO]: {
                title: 'Google Allo',
                synonyms: [
                'Allo',
                ],
                description: 'Introducing Google Allo, a smart messaging app that ' +
                'helps you say more and do more.',
                image: new Image({
                url: IMG_URL_GOOGLE_ALLO,
                alt: 'Google Allo Logo',
                }),
            },
        },
    }));
            agent.add(conv);
        });
        });
  }
    else {
        return admin.database().ref('yaris').once("value")
        .then(function(snapshot) {
        snapshot.forEach(function(model) {
            var value = model.val();
            const a11yText = 'Google Assistant Bubbles';
            const googleUrl = 'https://google.com';

                title: value.nombre,
                imageUrl: 'https://developers.google.com/actions/assistant.png',
                text: 'This is the body text of a card.  You can even use line\n  breaks and emoji! 💁',
                buttonText: 'This is a button',
                buttonUrl: 'https://assistant.google.com/'
            })
            );
        });
    });
  }
}

    // Run the proper function handler based on the matched Dialogflow intent name
 let intentMap = new Map();
  intentMap.set('ask-models', handelModel);
  agent.handleRequest(intentMap);

});

Answer 1

我在这个问题上找到了一些东西 https://github.com/dialogflow/dialogflow-fulfillment-nodejs/issues/37#issuecomment-437036370 :

Like jorgecasar pointed out, you need to set the agent.requestSource, otherwise, agent.conv() return null

const agent = new WebhookClient({ request, response });
agent.requestSource = agent.ACTIONS_ON_GOOGLE;

then agent.conv() would not return null