Get subcollection of a non existent document using python firebase-admin

Question

I am using python's firebase-admin. I want to fetch the subcollection (and its documents) but the problem is the parent documents of the subcollection do not exist. Even though the subcollections of the non existent documents are still accessible.

Here is the screenshot of the cloud firestore

Here is the code I tried but it prints nothing:

db = firestore.client(app)
message_docs = db.collection('message').get()
for doc in message_docs:
    print(doc.id)

Is it possible to fetch subcollections using python in this scenario? I don't know the ID of the documents.

Do you know the ID of the document whose subcollection you want to access? Please edit the question to be more clear about what you know ahead of time and what exactly you need to access from your data set. — Doug Stevenson, Feb 02 '21 at 07:12
I want to fetch the documents inside the subcollection. I don't have the document IDs. — Moin, Feb 02 '21 at 07:16
similar SO ref - https://stackoverflow.com/questions/65993832/firestore-is-not-retrieving-the-complete-data-values/65994222 — Muthu Thavamani, Feb 02 '21 at 07:23
https://stackoverflow.com/a/48177661/10285344 See this answer. — ASAD HAMEED, Feb 02 '21 at 07:34

score 2 · Accepted Answer · answered Feb 02 '21 at 07:19

Without a document ID, it's not possible. If you want all of the documents from all of the subcollections of all of the documents in "message" (both missing and present), then you can use a collection group query. Without a document ID, you can't construct a query for a specific subcollection.

Get subcollection of a non existent document using python firebase-admin

1 Answers1