CODEWITHSUNDEEP
javascriptfirebasegoogle-cloud-firestorereact-native-firebase
Honney Goyal
Honney Goyal

Reputation: 257

how to catch error in firestore when no internet

I recently updated my app from firebase to firestore but stuck at offline persistance. I am using react-native-firebase to integrate firestore and disable its perisistance but still not getting any catch error when no internet. This is my code to delete data but catch never gets error when no internet not is the promise resolved.

firebase.firestore().collection('d').doc(deviceid).delete().then(function () {
                                    console.log("Device Deleted");
                                    that.setState({
                                        loading: false
                                    });
                                    Toast.show('Device Deleted Succesfully', {
                                        duration: Toast.durations.SHORT,
                                        position: Toast.positions.TOP,
                                        shadow: true,
                                        animation: true,
                                        hideOnPress: true,
                                        delay: 0,
                                    });

                                }).catch(function (err) {
                                    console.log(err);
                                    that.setState({
                                        loading: false
                                    });
                                })

Upvotes: 15

Views: 12009

Answers (4)

Apetroaei Andrei
Apetroaei Andrei

Reputation: 438

You may use a transaction that will actually throw an error if it's unsuccessful. It has timeout and maxAttempts parameters.

Upvotes: 1

Mateja Petrovic
Mateja Petrovic

Reputation: 4317

Referencing this thread. I set up the following check:

.then(() => {
  if (snapshot.empty && snapshot.metadata.fromCache) {
     throw new Error('Failed to fetch ideas');
  }
})

Then later on I caught the error and set the app state to include the error along with parameters specific to the batch like startIndex and stopIndex which will be important later. When rendering the documents, one case is reserved for the BatchError as I dubbed it, in which case the user is going to see a Refetch button which has a callback attached to it. Using the batch metadata, the callback is able to reinitialize the specific batch request.

Upvotes: 5

Riku Räisänen
Riku Räisänen

Reputation: 178

Make your own helper function for deletion that throws an error if there is no Internet connection. You can make the API cleaner by not calling .collection() but rather passing the full path d + deviceid to it.

function onlineOnlyDelete(path) {
  if(!deviceApi.hasInternet()) throw 'No Internet, no delete'
  return firebase.firestore().doc(path).delete()
}

replace firebase.firestore().collection('d').doc(deviceid) with onlineOnlyDelete(d+deviceid) and you should be good to go

Upvotes: 7

Doug Stevenson
Doug Stevenson

Reputation: 317467

Firestore and Realtime Database SDKs don't throw errors when there is no network connectivity. They will silently retry the connection in hopes that the device will regain network connectivity soon. The reason for this is because most developers don't want their apps to appear broken just because the user went into a tunnel and back out, or switched between mobile towers in a way that forced a network reset.

In order to effectively make use of an online database, the device should be online most of the time, and this the situation that the SDK is optimizing for.

Upvotes: 22

Related Questions