Randomly generated Firebase child key in document path SwiftUI - swift

Question

I've had a look around and although there is some answers which are similar I can't find what I'm specifically looking for.
My data is stored in Firebase (Cloud Firestore) and I need to read that data back which is fine and working. My issue is I have changed the setup of the document file path to further increase security by adding a randomly generated id in the file path.
Firstly, is this possible to add the wildcard into a document path within Xcode? Secondly, could this be perhaps done as a string?
I have added the code below including file path.
Thanks in advance.
class getContactData : ObservableObject{
#Published var datas = [contactDataType]()
#AppStorage("selectedSchool") var selectedSchool: String = "selectedSchool"
init() {
let db = Firestore.firestore()
db.collection("/School Name/\(selectedSchool)/School Assets/**randomPath**/Contact Details").getDocuments { (snap, err) in
if err != nil{
print((err?.localizedDescription)!)
return
}
for i in snap!.documents{
let id = i.documentID
let adno = i.get("ID") as! String
let fullname = i.get("Full Name") as! String
let firstname = i.get("First Name") as! String
let lastname = i.get("Last Name") as! String
let registrationgroup = i.get("Registration Group") as! String
let priority1relation = i.get("Priority 1 Relation") as! String
let priority1fullname = i.get("Priority 1 Full Name") as! String
let priority1maintelephone = i.get("Priority 1 Main Telephone") as! String
let priority1mobile = i.get("Priority 1 Mobile") as! String
let priority2relation = i.get("Priority 2 Relation") as! String
let priority2fullname = i.get("Priority 2 Full Name") as! String
let priority2maintelephone = i.get("Priority 2 Main Telephone") as! String
let priority2mobile = i.get("Priority 2 Mobile") as! String
let priority3relation = i.get("Priority 3 Relation") as! String
let priority3fullname = i.get("Priority 3 Full Name") as! String
let priority3maintelephone = i.get("Priority 3 Main Telephone") as! String
let priority3mobile = i.get("Priority 3 Mobile") as! String
let priority4relation = i.get("Priority 4 Relation") as! String
let priority4fullname = i.get("Priority 4 Full Name") as! String
let priority4maintelephone = i.get("Priority 4 Main Telephone") as! String
let priority4mobile = i.get("Priority 4 Mobile") as! String
self.datas.append(contactDataType(id: id, adno: adno, fullname: fullname, firstname: firstname, lastname: lastname, registrationgroup: registrationgroup, priority1relation: priority1relation, priority1fullname: priority1fullname, priority1maintelephone: priority1maintelephone, priority1mobile: priority1mobile, priority2relation: priority2relation, priority2fullname: priority2fullname, priority2maintelephone: priority2maintelephone, priority2mobile: priority2mobile, priority3relation: priority3relation, priority3fullname: priority3fullname, priority3maintelephone: priority3maintelephone, priority3mobile: priority3mobile, priority4relation: priority4relation, priority4fullname: priority4fullname, priority4maintelephone: priority4maintelephone, priority4mobile: priority4mobile))
}
}
}
}
struct contactDataType : Identifiable {
var id : String
var adno : String
var fullname : String
var firstname : String
var lastname : String
var registrationgroup : String
var priority1relation : String
var priority1fullname : String
var priority1maintelephone : String
var priority1mobile : String
var priority2relation : String
var priority2fullname : String
var priority2maintelephone : String
var priority2mobile : String
var priority3relation : String
var priority3fullname : String
var priority3maintelephone : String
var priority3mobile : String
var priority4relation : String
var priority4fullname : String
var priority4maintelephone : String
var priority4mobile : String

Answer 1

In Firebase, if you add a new .document() without specifying the name of the document, it will create a document with a random generated ID. This is not a wildcard, but it will be a random path.
let firstCollection = "School Name"
let selectedSchool = "Selected School"
let secondCollection = "School Assets"
let thirdCollection = "Contact Details"
// Adding a document:
let newDocument = db.collection(firstCollection).document(selectedSchool).collection(secondCollection).document()
let randomPath = newDocument.documentID // You will need to store this if you need to access it directly later
let finalPath = newDocument.collection(thirdCollection)
finalPath.addDocument(data: ["info" : "info"], completion: nil)
Side note: it's best practice to keep the names of your collections and documents in the database lowercased and without spaces to avoid typing String errors ("School Name" -> "school_name").

Answer 2

Firestore does not support wildcards in queries.
If you want to query all documents among all subcollections named "Contact Details" anywhere in the database, then you can use a collection group query.
db.collectionGroup("Contact Details").getDocuments { (snap, err) in
// ...
}