Swift - Remove key and values from dictionary [String : Any] - swift

Question

I am trying to removed block users from a dictionary [String : Any] that I am grabbing from the database. At first I grab the list of UID's that the current user has blocked:
var updatedBlockList: Any?
func findBlockUsers() {
// find current users list of blocked users
guard let currentUserUid = Auth.auth().currentUser?.uid else { return }
let blockedUsers = Database.database().reference().child("users").child(currentUserUid)
blockedUsers.observeSingleEvent(of: .value, with: { (snapshot) in
guard let userIdsDictionary = snapshot.value as? [String: Any] else { return }
userIdsDictionary.forEach({ (key, value) in
guard let userDictionary = value as? [String: Any] else { return }
var blockedList : Any
blockedList = userDictionary.keys
print(blockedList)
self.updateBlockList(blockedList: blockedList)
})
})
}
func updateBlockList(blockedList: Any) {
updatedBlockList = blockedList
print(updatedBlockList)
}
If I print updatedBlockList I get: ["gdqzOXPWaiaTn93YMJBEv51UUUn1", "RPwVj59w8pRFLf55VZ6LGX6G2ek2", "xmigo8CPzhNLlXN4oTHMpGo7f213"]
I now want to take those UID's (which will be the key in UserIdsDictionary and remove them after I pull ALL the users:
fileprivate func fetchAllUserIds() {
let ref = Database.database().reference().child("users")
ref.observeSingleEvent(of: .value, with: { (snapshot) in
guard let userIdsDictionary = snapshot.value as? [String: Any] else { return }
userIdsDictionary.forEach({ (key, value) in
// attempting to remove the blocked users here without any luck
var updatedKey = key as String?
updatedKey?.remove(at: self.updatedBlockList as! String.Index)
print(updatedKey!)
guard let userDictionary = value as? [String: Any] else { return }
let user = User(uid: key, dictionary: userDictionary)
self.fetchPostsWithUser(user: user)
})
}) { (err) in
print("Failed to fetch following user ids:", err)
}
}
I get this error when trying to remove: Could not cast value of type 'Swift.Dictionary.Keys' (0x1de2f6b78) to 'Swift.String.Index'
I'm sure i'm going about this the wrong way, but I know i'm close. The end goal is to take the blocked users UID's and remove them from the dictionary. Any help would be very much appreciated!!

Answer 1

Your forEach loop on userIdsDictionary is the wrong approach here so rather than trying to fix that code I would use a different approach and loop over the updatedBlockList
for item in updatedBlockList {
if let userID = item as? String {
userIdsDictionary.removeValue(forKey: userID)
}
}

Answer 2

For anyone wondering, here is the final changes that were made to make it work.
var updatedBlockList = [String]()
func findBlockUsers() {
// find current users list of blocked users
guard let currentUserUid = Auth.auth().currentUser?.uid else { return }
let blockedUsers = Database.database().reference().child("users").child(currentUserUid)
blockedUsers.observeSingleEvent(of: .value, with: { (snapshot) in
guard let userIdsDictionary = snapshot.value as? [String: Any] else { return }
userIdsDictionary.forEach({ (key, value) in
guard let userDictionary = value as? [String: Any] else { return }
let blockedList = Array(userDictionary.keys)
print(blockedList)
self.updateBlockList(blockedList: blockedList)
})
})
}
func updateBlockList(blockedList: [String]) {
updatedBlockList = blockedList
print(updatedBlockList)
}
fileprivate func fetchAllUserIds() {
let ref = Database.database().reference().child("users")
ref.observeSingleEvent(of: .value, with: { [weak self] (snapshot) in
guard var userIdsDictionary = snapshot.value as? [String: Any], let self = self else { return }
for item in self.updatedBlockList {
userIdsDictionary.removeValue(forKey: item)
}
userIdsDictionary.forEach({ (key, value) in
guard let userDictionary = value as? [String: Any] else { return }
let user = User(uid: key, dictionary: userDictionary)
self.fetchPostsWithUser(user: user)
})
}) { (err) in
print("Failed to fetch following user ids:", err)
}
}