Chris Chris - 6 months ago 26
iOS Question

Snapshot in firebase. how to dig deeper into the snapshot

currently my data is as such

{
'listone':
{
'entrydate1':
{
'random key 1':
{
'name': 'Chris';
'date': '24 May 2016'
}
'random key 2':
{
'name': 'John';
'date': '25 May 2016'
}
}
'entrydate2':
{
'random key 1':
{
'name': 'Chris';
'date': '24 May 2016'
}
'random key 2':
{
'name': 'John';
'date': '25 May 2016'
}
}
}
}


The random key is generated by firebase
childByAutoID()


The question is when I get my snapshot, how do I get the details of each random key? Basically I need to retrieve the data from
listone
and I will populate my
tableview
by sorting the earliest
entrydate
. however after getting the snapshot I am lost as to how I can get the information out of the snapshot.

override func viewDidLoad() {
super.viewDidLoad()
ref = FIRDatabase.database().reference()
let uid = FIRAuth.auth()!.currentUser!.uid

let listOneRef = ref.child(uid + "/listone")

_ = listOneRef.observeEventType(.Value, withBlock: { (snapshot) in


for item in snapshot.children {
let child = item.children.allObjects

for snap in child {
//anyitems was initialized as [AnyObject] array
self.anyitems.append(snap)

}
}
self.tableView.reloadData()
})


I have no idea how to actually make use of the details. when I print
anyitems
I do see some details i.e.

[Snap (-KJ-jqTNf3MTtY8YRH-3) {
Name = "Chris";
Date = "30 May 2016";
}, Snap (-KJ01QYoTedZkClsf13Y) {
Name = "John";
Date = "30 May 2016";
}]

Answer

I'm not on Xcode right now so I can't verify, but it should be something like:

for snapshot in anyitems {
    print(snapshot.value.objectForKey("Name"))
}

And I think subscripting should also work:

for snapshot in anyitems {
    print(snapshot.value["Name"])
}

If you need to tell the type to the compiler:

for snapshot in anyitems as! [FIRDataSnapshot] {
    print(snapshot.value.objectForKey("Name"))
}

But it would be better, as you've noticed, to safely cast the array before accessing its content:

if let snapshots = snapshot.children.allObjects as? [FIRDataSnapshot] {

}