Google Cloud Functions Error: “Cannot decode type from Firestore Value”

Question

Using Firestore in a React app, Im testing out using Google Cloud Functions to grab a document field, and then create a new field in Firestore using that field. I had it working the other day and now it is not.

This is the error that Im getting in the Google Cloud Function log:

Error: Cannot decode type from Firestore Value: {"stringValue":"sox"} at DocumentSnapshot._decodeValue

Below is the code I used. It is very similar to the code here: https://firebase.google.com/docs/firestore/extend-with-functions#writing_data

exports.createShowDoubleName = functions.firestore
  .document('shows/{showId}')
  .onUpdate((event) => {
    const data = event.data.data();
    const previousData = event.data.previous.data();
    if (data.name == previousData.name) return;
    var name = data.name;
    var newname = name+"_"+name
     return event.data.ref.set({
        newname: newname
      }, {merge: true});
});

Doug Stevenson Doug Stevenson · Accepted Answer · 2017-12-20T01:19:55

firebase-functions SDK version 0.7.5 is supposed to fix the problem. It now forces a peer dependency on firebase-admin 5.5.0. Get it:

npm install [email protected]

Google Cloud Functions Error: “Cannot decode type from Firestore Value”

4 Answers