How would I iterate over all keys to get specific child value? - ios

Question

I am trying to iterate over all keys under "Timetable" to get the key value and Name of those that have an approved value of "Yes".
So for the following JSON structure:
Timetable
Pikes_Lane_Primary_School_Bolton_UK
Approved: Yes
Name: Pikes Lane Primary School
Essa_Academy_Bolton_UK
Approved: No
Name: Essa Academy
Ladybridge_High_School_Bolton_UK
Approved: Yes
Name: Ladybridge High School
My desired output would be:
Pikes_Lane_Primary_School_Bolton_UK
Pikes Lane Primary School
Ladybridge_High_School_Bolton_UK
Ladybridge High School
This is the best I've managed to do over the last few hours:
let schoolDatabase = Database.database().reference().child("Timetable")
schoolDatabase.observeSingleEvent(of: .value, with: { (snapshot) in
for child in snapshot.children {
let schoolID = child as! DataSnapshot
//print(schoolID.key)
for grandchild in schoolID.children {
let varOne = grandchild as! DataSnapshot
print(varOne.key)
}
}
})
This brings back the following:
Approved
Name
Approved
Name
Approved
Name

Answer 1

let schoolDatabase = Database.database().reference().child("Timetable")
schoolDatabase
.queryOrdered(byChild: "Approved")
.queryEqual(toValue: "Yes")
.observeSingleEvent(of: .value, with: { (snapshot) in
let children = snapshot.children
.compactMap { $0 as? DataSnapshot }
children.forEach { tuple in
print(tuple.key)
if let tupleDictionary = tuple.value as? [String: Any] {
let name = tupleDictionary["Name"] as? String
print(name ?? "-")
}
}
}
)
Or if you are interested only in names (without key):
let schoolDatabase = Database.database().reference().child("Timetable")
schoolDatabase
.queryOrdered(byChild: "Approved")
.queryEqual(toValue: "Yes")
.observeSingleEvent(of: .value, with: { (snapshot) in
let children = snapshot.children
.compactMap { $0 as? DataSnapshot }
.compactMap { $0?.value as? [String: Any]}
.compactMap { $0["Name"] as? String }
children.forEach { name in
print(name)
}
}
)

Answer 2

Finally got there in the end!
let schoolDatabase = Database.database().reference().child("Timetable")
schoolDatabase.observeSingleEvent(of: .value, with: { (snapshot) in
for child in snapshot.children {
let schoolID = child as! DataSnapshot
let stringApproved = schoolID.childSnapshot(forPath: "Approved").value
let stringSchoolName = schoolID.childSnapshot(forPath: "Name").value
if stringApproved as? String == "Yes" {
print(schoolID.key)
print((stringSchoolName)!)
print((stringApproved)!)
}
}
})