Most liked item from last 7 days? - swift

Question

I am using Firestore for my app and would like to be able to get the most liked item posted within the last 7 days. In an ideal world the call would look something like:
let calendar = Calendar.current
let components = calendar.dateComponents([.year, .month, .day], from: Date())
let start = calendar.date(from: components)!
let startDate = calendar.date(byAdding: .day, value: -7, to: start)!
let startDateStamp: Timestamp = Timestamp(date: startDate)
let mostLiked = colRef
.whereField("isReported", isEqualTo: false)
.whereField("timestamp", isGreaterThanOrEqualTo: startDateStamp)
.order(by: "likeCount", descending: true)
.limit(to: 1)
mostLiked.getDocuments { (snapshot, error) in
if let error = error { return }
guard let snap = snapshot else { return }
for document in snap.documents {
let data = document.data()
print(data)
}
}
But this is obviously not allowed.
I have ended up with:
let calendar = Calendar.current
let components = calendar.dateComponents([.year, .month, .day], from: Date())
let start = calendar.date(from: components)!
let startDate = calendar.date(byAdding: .day, value: -7, to: start)!
let startDateStamp: Timestamp = Timestamp(date: startDate)
let mostLiked = colRef
.whereField("isReported", isEqualTo: false)
.whereField("timestamp", isGreaterThanOrEqualTo: startDateStamp)
.order(by: "timestamp", descending: true)
mostLiked.getDocuments { (snapshot, error) in
if let error = error { return }
guard let snap = snapshot else { return }
for document in snap.documents {
let data = document.data()
...
data handling code to fill struct - newTopItem
...
if self.topLikedArray.isEmpty {
self.topLikedArray.append(newTopItem)
} else {
if likeCount > self.topLikedArray[0].likeCount! {
self.topLikedArray.removeAll()
self.topLikedArray.append(newTopItem)
}
}
}
print("Top Item: \(self.topLikedArray)")
}
Which fetches everything within the last 7 days and I'll have to manually sort through to get the max likeCount, which seems a little clumsy to me not to mention the scalability issue it presents as I can't limit the results to just 1. Is there a better way to do this?

Answer 1

let mostLiked = bleatsRef
.whereField("isReported", isEqualTo: false)
.whereField("timestamp", isGreaterThanOrEqualTo: startDateStamp)
.order(by: "likeCount", descending: true)
.limit(1)
mostLiked.getDocuments { (snapshot, error) in
guard
error == nil,
let snap = snapshot
else { return }
print("The most liked document is: \(snap.documents.first)")
}