Firestore Emulator allowing two documents with same ID.

The firestore emulator is allowing two documents with the same ID to be added in a collection. (I have attached the screenshot).

The original document was imported while starting the emulator. When I tried to fetch the document in my web app (React), the “doc.exists” property was false.

I created a new document with the same ID (keeping the old one there) and it allowed me to create a new document. Also, I was able to fetch the newly created document.

[REQUIRED] Environment info

firebase-tools: 8.6.0

Platform: macOS

[REQUIRED] Test case

Creating two documents in Firestore Emulator with the same ID. One of the documents was imported from a previous export. The other was created on the Emulator UI (on Google Chrome).

[REQUIRED] Steps to reproduce

1. Start the emulator (new, fresh version).
2. Create a test document with a specific ID in a collection.
3. Export the data (using export flag) and close it.
4. Start the emulator again, but this time importing the previously exported data.
5. Try fetching (reading) the old document on a web application (doc.exists will be false)
6. Add a new document in the same collection with the same ID.
7. Try fetching (reading) the document again, this time it succeeds.

[REQUIRED] Expected behavior

1. New document with same ID should not be allowed in the same collection.
2. It should be possible to fetch an already existing document from a previous import.

[REQUIRED] Actual behavior

1. New document with same ID was created using the Emulator UI.
2. Old document wasn’t being read (doc.exists = false) on running the “get()” method on a web application. New document was successfully read from the Firestore database once created.

firestore-debug.log ui-debug.log

[MohamedRed]

Hi, My comment has nothing to do with the firebase Emulator.

I just wanted to mention when I create a new document in Cloud Firestore manually using the firebase console with an id ID1, I can then create programatically using the javascript SDK (batch.set) a second document with the same ID1.

I create a document reference to the first document manually created with an auto-generated id ID1. I then batch.set() this document reference with an object. It will then not update the first document manually created, it will instead create a new document with the same id ID1.

[malcolmdeck]

Sorry for the slow reply - this is being tracked internally as b/163146117