How to display nested objects in firebase data - swift

Question

How to display the below data in a view:
[
"parties" {
"2016-12-30" {
"uid" {
"name": "joe",
"age": "32"
},
"uid" {
"name": "kevin",
"age": "29"
}
},
"2016-12-25" {
"uid" {
"name": "ben"
"age": "44"
}
}
}
]
In my controller I have
var parties = [Party]()
DataService.ds.REF_PARTIES.observe(.value, with: { (snapshot) in
if let snapshot = snapshot.children.allObjects as? [FIRDataSnapshot] {
print(snapshot)
for snap in snapshot {
if let partyDict = snap.value as? [String: AnyObject] {
let key = snap.key // the party date
let party = Party(date: key, partyData: partyDict)
self.parties.append(party)
}
}
}
self.tableView.reloadData()
})
class PartyFeedCell: UITableViewCell:
func configureCell(party: Party) {
dateLabel.text = part.date // date as expected
}
In react, I could use Object.key to go deeper in the loop and get the users for those dates (keys). Any way to accomplish this? Under, say xxx date, I should see a list of users.
Party.swift:
import Foundation
class Party {
private var _name: String!
private var _age: String!
var name: String {
return _name
}
[...]
init(name: String, age: String) {
self._name = name
self._age = age
}
init(date: String, partyData: [String: AnyObject]) {
self._date = date
[...]
}
}
DataService.swift:
import Foundation
import FirebaseDatabase
let DB_BASE = FIRDatabase.database().reference()
class DataService {
static let ds = DataService()
private var _REF_BASE = DB_BASE
private var _REF_PARTIES = DB_BASE.child("parties").queryOrderedByKey()
var REF_BASE: FIRDatabaseReference {
return _REF_BASE
}
var REF_PARTIES: FIRDatabaseQuery {
return _REF_PARTIES
}
}

Answer 1

Two things:
Using dates as key's... while it may be ok, should probably be changed - best practice is to disassociate keys from the data contained in the children.
parties
-Y9809s0asas
date: "2016-12-30"
users:
uid_0: true
uid_1: true
-Y89js99skks
date: "2016-12-15"
users:
uid_1: true
uid_3: true
users
uid_0:
name: "ben"
age: "42"
uid_1:
name: "frank"
age: "28"
etc
The keys within parties are generated by childByAutoId (Y9809s0asas etc)
Second thing is that the code looks pretty much ok. The question appears to be how to get a value from a Dictionary?
In this case the code assigns the snap.value as a dictionary of [String: AnyObject] to partyDict. So at that point partyDict is just a Dictionary of key:value pairs
So in your Party class just a simple assignment is all that needs to be done:
init(date: String, partyData: [String: AnyObject]) {
self._date = date
self._age = partyData["age"]
self._name = partyData["name"]
}
I didn't run your code but it's pretty close to being usable.
Oh - with this change in structure you will want to add one more property to the Party class, key. Make sure you pass the parent node name (snap.key) into the class so if it needs to be updated etc it will have the parent node name stored (the Y9809s0asas from the above structure)