CODEWITHSUNDEEP
firebaseflutterdartgoogle-cloud-functions
Parth Bhanderi
Parth Bhanderi

Reputation: 2598

Callable Cloud Function error: Response is missing data field

Don't know how to get responce from cloud function in flutter.

My cloud function

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp();

exports.testDemo = functions.https.onRequest((request, response) => {
  return response.status(200).json({msg:"Hello from Firebase!"});
 });

My flutter code

///Getting an instance of the callable function:
    try {
      final HttpsCallable callable = CloudFunctions.instance.getHttpsCallable(
        functionName: 'testDemo',);

      ///Calling the function with parameters:
      dynamic resp = await callable.call();
      print("this is responce from firebase $resp");

    } on CloudFunctionsException catch (e) {
      print('caught firebase functions exception');
      print(e.code);
      print(e.message);
      print(e.details);
    } catch (e) {
      print('caught generic exception');
      print(e);
    }

flutter: caught firebase functions exception flutter: INTERNAL flutter: Response is missing data field. flutter: null

Upvotes: 14

Views: 9493

Answers (3)

Deep Gandhi
Deep Gandhi

Reputation: 395

you can convert to .onCall type function if you want to call function by it's name. aldobaie's answer

or for onRequest type function:

we need to call it as RESTful APIs.

While deploying to firebase, we'll get functions URL

or we can get function URL from dashboard of functions from firebase.

enter image description here

URL is in formate of:

https://us-central1-< projectName >.cloudfunctions.net/< functionName >

call it as any other RESTful API. plus point of using it as API is that data field in response isn't mandatory and freedom of response formate.

Upvotes: 0

Roger Gusmao
Roger Gusmao

Reputation: 4106

You must explicity put the attribute "data" in the json of response.

Like:

response.send({
"status" : success,
"data" : "some... data"
});

Upvotes: 8

aldobaie
aldobaie

Reputation: 1407

Use 

exports.testDemo = functions.https.onCall((data, context) => {
  return {msg:"Hello from Firebase!"};
});

in cloud functions. Callable is different than Request

When you call the functions you need to add the parameters:

change:

 // Calling a function without parameters is a different function!
  dynamic resp = await callable.call();

to:

dynamic resp = await callable.call(
     <String, dynamic>{
       'YOUR_PARAMETER_NAME': 'YOUR_PARAMETER_VALUE',
     },
);

as described here

then to print the response:

print(resp.data)
print(resp.data['msg'])

The Firebase Functions for flutter example here and here

Upvotes: 16

Related Questions