Cloud Firestore subcollection access

user_195969 0
Viewed 60

When accessing subcollections, should one use code like this:

DocumentSnapshot userSnapshot = await Firestore.instance
          .collection('users')
          .document(userId)
          .collection('shoppingLists')
          .document(listName)
          .get();

or this:

DocumentSnapshot userSnapshot = await Firestore.instance
          .collection('users/$userId/shoppingLists')
          .document(listName)
          .get();

?

I prefer the first style. Do they translate to the same I/O?

google-cloud-firestore dart flutter
2 Answers

There's no difference in result.

Actually, you can even shorten the second one to:

DocumentSnapshot userSnapshot = await Firestore.instance
          .document('users/$userId/shoppingLists/$listName')
          .get();
user_13219170

From the Documentation:

Every document or collection in Cloud Firestore is uniquely identified by its location within the database, and you can create a reference that points to it. For convenience, to access the Cloud Firestore hierarchical data model, you can create references by specifying the path to a document or collection as a string, with path components separated by a forward slash (/).

Therefore, you can choose to use either of the two methods you posted earlier or shorten it even further as @AndreyGordeev suggested. It's really up to you.

user_77258790
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