Tukukkk

I'm building a chat app where there are GroupConversations and GroupMessages. Following the example of some of the Firestore YouTube videos, I've chosen to structure my data this way:

The ID of the GroupConversation is the ID for the collection of GroupMessages associated with that GroupConversation. Then inside of that document should be a new collection called Messages which holds documents.

Does that make sense or am I overcomplicating things? I can't seem to create that Messages collection or set anything to it in my Swift code

GroupConversations

    id

    title

    desc

    memberIds



GroupMessages 

    GroupConversationID

        createdAt: Date // just because I need a key and a document?

        Messages (new collection)

            Message1

            Message2

            Message3

Thanks

Edit: Added Swift code

        let db = Firestore.firestore()

        var data: [String: Any] = [

            "text": title,

            "senderUsername": username,

            "createdAt": Date(),

            "updatedAt": Date()

        ]



        let creationData: [String: Any] = [

            "text": "Group Created",

            "createdAt": Date()

        ]



        let doc = db.collection("GroupMessages").addDocument(data: creationData)

        db.document("GroupMessages/(groupConvo.documentId)/(doc.documentID)/messages").setData(data) { error in

            if error == nil {

                completion()

            }

        }

In my console, I'm seeing a new GroupMessage object created but not sub-collection of that GroupMessage called messages

You're not building the path to the document correctly. Document paths always alternate between collection and document names. To build a path to a document in a subcollection, it would go collection/document/subcollection/document. It looks like you've mixed up the last two elements in the string you're building.

In my opinion, it's harder to go wrong if you build up the document using methods rather than trying to build a string. Something like this:

db

    .collection("GroupMessages")

    .document(groupConvo.documentId)

    .collection("Messages")

    .document(doc.documentId)

    .setData(...)