how to get the .child key in an array? - swift

Question

I want to take the save all of my blocked user child as a string in my code. But as simple as it might sound I was not able to figure it out.
static func block(myself: String, posterUID: String){
var blockedUserRef = Database.database().reference().child("users").child(myself).child("blockedUsers").child(posterUID)
blockedUserRef.setValue(true)
var blokedArray:[String] = []
var handle:DatabaseHandle!
blockedUserRef = Database.database().reference()
handle = blockedUserRef.child("blockedUsers").observe(.childAdded, with:{ (DataSnapshot) in
if let item = DataSnapshot.value as? String{
blokedArray.append(item)
}
})
}
I want to take the array of my blocked users go through in for loop and filter them from showing.
ref.observeSingleEvent(of: .value, with: { (snapshot) in
guard let snapshot = snapshot.children.allObjects as? [DataSnapshot]
else { return completion([]) }
// 3 filter the user from the array
let users =
snapshot
.flatMap(User.init)
.filter { $0.uid != currentUser.uid }
Here is my firebase:
"users" : {
"3YLVUDA8YnSuVYUTxv6cvOQPSjm1" : {
"username" : "🌸😍🌸"
},
"4duY2hhTv5S7sSXtZYBfiP7JBLz1" : {
"username" : "Love from NYC"
},
"58t0M2Fxxhg6GRT96vVbKMFHRKO2" : {
"blockedUsers" : {
"4duY2hhTv5S7sSXtZYBfiP7JBLz1" : true,
"SqarOdPJUydcdV6deXTeIdzkarE2" : true
},
"username" : "IStandWithYou"
},
some new ways I am trying I debugged it and it seems that it is not saving it onto the array
///adedblock
var blockedUserRef = Database.database().reference().child("users").child(currentUser.uid).child("blockedUsers")
var blokedArray:[String] = []
var handle:DatabaseHandle!
blockedUserRef = Database.database().reference()
handle = blockedUserRef.child("blockedUsers").observe(.childAdded, with:{ (DataSnapshot) in
if let item = DataSnapshot.value as? String{
blokedArray.append(item)
}
})
for user in blokedArray{
let users =
snapshot
.flatMap(User.init)
.filter { $0.uid != user }
}

Answer 1

This can be done by saving all of the child entries of blockedUsers to an array that will hold all your strings.
To do this, first create an empty array like
myList:[string] = []
Then, you need to create a reference to your Firebase database like:
var ref: DatabaseReference!
You also need a database handle to navigate around your database:
var handle:DatabaseHandle!
Now, you need to go to your ViewDidLoad function and add code like:
ref = Database.database().reference()
handle = ref?.child("blockedUsers").observe(.childAdded, with:{ (DataSnapshot) in
if let item = DataSnapshot.value as? String{
self.myList.append(item)
}
})
This piece of code is checking whether an entry is added to the child database "blockedUsers", and from that, it is adding whatever was just entered into the array.
Now, you have an array filled with whatever was in the child database, blockedUsers. You can now use the array in a UITableView, or list it in a label.
Hope this helped!