I'm having an issue with a Firestore observer and it's associated rules. I'm trying to have rules that only allow the user to see invites that contain the user's email address. However, if I delete a document from the collection, the snapshot observer throws an error Uncaught Error in onSnapshot: FirebaseError: Null value error. for 'get' @ L92.
Here's my rules:
match /invites/{inviteID} {
function isSignedIn() {
return request.auth != null;
}
function isUserInvite() {
return request.auth.token.email != null &&
request.auth.token.email == resource.data.user_email;
}
allow read: if isSignedIn() && isUserInvite();
allow write: if true;
}
And here's my listener.
firebase.firestore()
.collection("invites")
.where(`user_email`, '==', myUserEmail) // this would be the users email
.onSnapshot((snapshot) => {
snapshot.forEach( doc => {
console.log(doc.id, doc.data())
})
})
It works for observing new documents, but fails when deleting a document. The following code makes the observer throw an error.
// creates a new invite and the snapshot listener informs me
await firebase.firestore()
.collection('invites')
.doc("invite_1")
.set({
user_email: someUserEmail, // use the users email here
date_added: firebase.firestore.FieldValue.serverTimestamp()
})
// deletes the invite, but the snapshot throws an error
await firebase.firestore()
.doc(`invites/invite_1`)
.delete()
UPDATE
I've found that this is only happening in the firestore emulator and not in production. Both the emulator and production have the same rules.
