Messenger First App 的 Facebook Bot 教程 - firstEntityValue 未定义

Question

我正在关注此处的 Facebook Bot for Messenger First App 教程： https://wit.ai/docs/quickstart

情况是，在克隆项目 (https://github.com/wit-ai/node-wit.git) 并按照第一步操作后，当我运行机器人时，我收到此错误： firstEntityValue 未定义

我的代码：

'use strict';

const Wit = require('../').Wit;

const token = (() => {
    if (process.argv.length !== 3) {
        console.log('usage: node examples/weather.js <wit-token>');
        process.exit(1);
    }
return process.argv[2];
})();

const actions = {
    say: (sessionId, msg, cb) => {
    console.log(msg);
    cb();
},
merge: (context, entities, cb) => {
    //Retrieve the location entity and store it into a context field
    const loc = firstEntityValue(entities, 'location');
    if(loc) {
       context.loc = loc;
    }
    cb(context);
},
error: (sessionId, msg) => {
    console.log('Oops, I don\'t know what to do.');
},
'fetch-forecast': (context, cb) => {
    // Here should go the api call, e.g.:
    // context.forecast = apiCall(context.location)
    context.forecast = 'cloudy';
    cb(context);
},
};

const client = new Wit(token, actions);
client.interactive();

有什么帮助吗？

Answer 1

遇到同样的问题，找到这里定义的函数https://github.com/wit-ai/node-wit/blob/1c4aedea09332b471d8c45060a1dc1f91f65eff5/examples/joke.js

const firstEntityValue = (entities, entity) => {
  const val = entities && entities[entity] &&
    Array.isArray(entities[entity]) &&
    entities[entity].length > 0 &&
    entities[entity][0].value
  ;
  if (!val) {
    return null;
  }
  return typeof val === 'object' ? val.value : val;
};

您需要将其添加到您的 index.js 或将其作为模块包含。

Messenger First App 的 Facebook Bot 教程 - firstEntityValue 未定义

Facebook Bot for Messenger First App tutorial - firstEntityValue is not defined

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