Reading Firebase child by auto ID swift - swift

Question

This is a quick output of my Firebase tree, id like to access people_on_this_planit / userID node. My only issue is that node is within an auto ID; please any help would be appreciated. Thanks
planits
-LEmgxuG_13KNA5inRaB
Planit Title: "Some title"
people_on_planit
-LEmh6IxqguVBJEwghZv (auto ID)
userID: "kkdiEW0D9"
senderId: "39FdLfdIO8832"
Right now the code i am using is as follows, but i am getting nil when i print peopleonplanit.
ref = Database.database().reference()
let userID = Auth.auth().currentUser?.uid
let planitsRef = ref.child("planits")
for child in snapshot.children {
let childSnap = child as! DataSnapshot
let dict = childSnap.value as! NSDictionary
let planKey = childSnap.key
//print(planKey)
print(dict)
let title = dict["Planit Title"] as! String
let senderID = dict["senderId"] as! String
let peopleOnPlanit = dict["people_on_planit"] as? String
print(peopleOnPlanit)
}

Answer 1

Here's the code to read the Firebase structure proposed in the question
let planitsRef = self.ref.child("planits")
planitsRef.observeSingleEvent(of: .value, with: { snapshot in
for child in snapshot.children {
let planSnap = child as! DataSnapshot
let planDict = planSnap.value as! [String: Any]
let title = planDict["plan_title"] as! String
let senderId = planDict["sender_id"] as! String
print("plan title: \(title) senderId: \(senderId)")
let peopleOnPlanitSnap = planSnap.childSnapshot(forPath: "people_on_planit")
for peopleChild in peopleOnPlanitSnap.children {
let peopleChildSnap = peopleChild as! DataSnapshot
let userSnapDict = peopleChildSnap.value as! [String: Any]
let userId = userSnapDict["user_id"] as! String
print(" userId: \(userId)")
}
}
})
and the output
plan title: Some title senderId: 39FdLfdIO8832
userId: uid_0
userId: uid_1
-- A couple of notes --
Since the associated users appear to be stored by their user Id and that's the only data stored within that node, you may want to change this node
people_on_planit
-LEmh6IxqguVBJEwghZv (auto ID)
userID: "kkdiEW0D9"
to look like this
people_on_planit
uid_x: true //uid_x would be kkdiEW0D9 etc
uid_y: true
it's a bit shallower and cleaner and requires less code to read it. Also, you can query it more easily if that ever comes up.
also note that I changed the naming convention slightly; you are welcome to format keys however you want but I went with keys like plan_title instead of PlanIt Title and sender_id and user_id instead of senderId and userId. My practice is for actual firebase keys I use all lowercase, underscore instead of spaces, and in code, I use lower/uppercase with no spaces. So if you copy paste my code, you'll need to change those.