Firestore - get the parent document of a subcollection

The QuerySnapshot points to a number of QueryDocumentSnapshot instances.

From a QueryDocumentSnapshot, you can get the collection it's from with:

snapshot.getRef().getParent()

And then the parent DocumentReference is:

snapshot.getRef().getParent().getParent()

So to get a subscollection of the parent document with:

snapshot.getRef().getParent().getParent().collection("name_of_subcollection")

Yes, I agree... that could've been a bit more readable. :)

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