So, when Single Event is used in the first snapshot below (see bold), array1 (coming from the 2nd snapshot) can't be picked up by the first snapshot. But when .observe is used instead, it can. Why could that be?
At first I couldn't understand why Single Even fails, but .observe doesn't. I made a lot of prints and found that the 2nd snapshot works just fine. But array1 in the second snapshot is not recognized if .SingleEvent is used. It is, however, recognized if .observe is used instead.
/////first snapshot
let thisUsersUid = Auth.auth().currentUser?.uid //Mr. Dunn's uid
refArtists = Database.database().reference().child("people");
**refArtists.observeSingleEvent**(of: .value, with: { [weak self]snapshot in
if snapshot.childrenCount>0{
self.people.removeAll()
for people in snapshot.children.allObjects as! [DataSnapshot] {
if people.key != thisUsersUid {
print("peoplekey",people.key)
let peopleObject = people.value as? [String: AnyObject]
let peopleEducation = peopleObject?["Education"] as? String
...
let userId = people.key
...
if Calendar.current.isDateInToday(date) {
let distance = locCoord.distance(from: self.dict)
print(distance, "distancexy")
if distance/1609.344 < 3000 && self.array1.contains(people.key){
print(self.array1, "f111111")
print("fee", self.dict )
print(distance, "distancexy")
let peopl = Userx(Education: peopleEducation, .......)
self.people.append(peopl)
let d = people.key
self.printPersonInfo(uid:d)
} else {
print ("w")
}
} else {
print ("alpha")
}
}
print("aaaaaaaa", self.people.map {$0.distance})
}
self.people.sort { ($0.distance ?? 0) < ($1.distance ?? 0) }
}
})
//////2nd snapshot that makes array1 for 1st snapshot
guard let myUid = Auth.auth().currentUser?.uid else { return }
refArtists = Database.database().reference().child("people").child(myUid).child("e2")
refArtists.observeSingleEvent(of:.value, with: {snapshot in
let myDomain = snapshot.value as? String
self.bSnap = myDomain
print("haaal", self.bSnap)
let peopleRef = Database.database().reference().child("people")
let thisPersonRef = peopleRef.child(myUid).child("e2")
thisPersonRef.observeSingleEvent(of:.value, with: {snapshot in
if snapshot.exists() {
let query = Database.database().reference().child("people").queryOrdered(byChild: "e2").queryEqual(toValue: self.bSnap)
query.observeSingleEvent(of: .value, with: { snapshot in
var allUsers = snapshot.children.allObjects as! [DataSnapshot]
///////end (1) of comment
if let index = allUsers.firstIndex(where: { $0.key == myUid } ) {
allUsers.remove(at: index) //remove the current user
} /////end (2) of comment
for userSnap in allUsers {
let name = userSnap.childSnapshot(forPath: "postID").value as? String
print(name, "NNN")
if let unwrappedName = name {
**self.array1.append(unwrappedName)**
}
}
print(self.array1, "ahah")
})
} else {
print("no")
}
})
})
