There has been no answer provided. Could this be due to being utilized in an asynchronous function that was not returned as a promise?

I encountered the following error message:

Error: No response has been set. Is this being used in an async call that was not returned as a promise to the intent handler?
    at DialogflowConversation.response (/user_code/node_modules/actions-on-google/dist/service/actionssdk/conversation/conversation.js:162:19)
    at DialogflowConversation.serialize (/user_code/node_modules/actions-on-google/dist/service/dialogflow/conv.js:134:89)
    at Function.<anonymous> (/user_code/node_modules/actions-on-google/dist/service/dialogflow/dialogflow.js:154:28)
    at next (native)
    at fulfilled (/user_code/node_modules/actions-on-google/dist/service/dialogflow/dialogflow.js:19:58)
    at process._tickDomainCallback (internal/process/next_tick.js:135:7)

Below is the code snippet where I believe the issue lies. I have utilized promises, but please correct me if I'm mistaken in their implementation.

public  getTodaysEntryOfUser(conv: any) : any {
            this.getDataFromDatabase(conv).then((todaysEntry) => {
                conv.ask('<speak>Welcome to my application <break time="1"/> </speak>');
                let question:Question =  this.getStartQuestion(1);
                conv.ask('<speak>'+question.ask+'</speak>');
                conv.data.kind  = question.resolution.kind;
                return question;
            })
            .catch(err => {
                console.log('Error getting document', err);
                return err;
             });

        }

Here's the code for the method "getDataFromDatabase":

public async getDataFromDatabase(conv: any) : Promise<any> {
            let getPromise  =   await this.getDAOaccess(conv);
            return getPromise;
        }

And the code for the method "getDAOaccess":

private getDAOaccess(conv:any) : Promise<any>{
            return new Promise<any>((resolve,reject) => {
                this.getDataFromDB(conv,(err:any,response:any)=>{
                    if(err)
                        reject(err);
                    else
                        resolve(response);
            });
        });

        }

Lastly, here's the code for the method "getDataFromDB":

private getDataFromDB(conv:any, callback: (err:any,response:any) => void ) : Promise<any> {
            let  self    =   this;
            let documentDetail;
            let subjectId    =   conv.request.user.userId;
            let questionID   =   conv.request.user.questionID;
            let docRef=  this.dbManager.collection('question').doc(subjectId);
            return new Promise((resolve, reject) => {
                docRef.get().then(doc => {
                   documentDetail  =   doc;
                   conv.user.response= doc.data();
                   return resolve(doc.data());
                })
                .catch(err => {
                   console.log('Error getting document', err);
                   reject(err);
                });

            });
        }

If you could help pinpoint the issue in the code, I would greatly appreciate it. Thank you in advance.

Answer №1

The problem lies in the fact that the function getTodaysEntryOfUser() does not return a Promise. It seems like this function is meant to be an intent handler (although you haven't shown how it's registered), and due to Dialogflow library's behavior, functions without returning Promises are treated as synchronous operations.

If your calls involve asynchronous tasks, make sure:

  1. You call conv.ask() inside the Promise resolution
  2. You explicitly return a Promise

In this scenario, simply adding a return before the line may solve the issue:

this.getDataFromDatabase(conv).then(

Answer №2

It seems like there is confusion in the implementation of your method getDataFromDB. There is a parameter callback that is defined but never used, and the method returns a Promise which is ignored when calling it since the unused callback parameter is passed in.

To address this, modify getDAOaccess to utilize the returned Promise:

private getDAOaccess(conv: any): Promise<any> {
        return this.getDataFromDB(conv);
    }

The function getDAOaccess appears to be redundant so you can simplify by directly calling getDataFromDB from getDataFromDatabase.

Another issue lies in the code where a Promise is returned unnecessarily, eliminating the need for using await on the inner call. Simply return the Promise that was originally returned:

public async getDataFromDatabase(conv: any): Promise<any> {
        let getPromise = await this.getDAOaccess(conv);
        return getPromise;
}

This should then be revised to:

public getDataFromDatabase(conv: any): Promise<any> {
        return this.getDataFromDB(conv);
}

Upon closer inspection, the above method also doesn't perform any meaningful operation.

In the following method, there is an issue with handling asynchronous calls within the outer method. It is advisable to mark the function as async:

public async getTodaysEntryOfUser(conv: any) {
    const todaysEntry = await this.getDataFromDB(conv);
    conv.ask('<speak>Welcome to my application <break time="1"/> </speak>');
    let question:Question =  this.getStartQuestion(1);
    conv.ask('<speak>'+question.ask+'</speak>');
    conv.data.kind  = question.resolution.kind;
    return question;
}

After these changes, the method now returns a Promise<Question>, which needs to be handled appropriately wherever the method getTodaysEntryOfUser is invoked. Additionally, it's important to ensure proper typing rather than using any for parameters for better error detection and prevention.

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