how to catch error in firestore when no internet

Question

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
                                    });
                                })

Answer 1

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