Trabalhando com Change Streams do seu aplicativo Swift

1
@State private var changeStream: ChangeStream<ChangeStreamEvent<BSONDocument>>?

1
@State private var latestChangeEvent: ChangeStreamEvent<BSONDocument>?

1
func registerChangeStream() async {
2
    // If the view already has an active change stream, close it down
3
    if let changeStream = changeStream {
4
        _ = changeStream.kill()
5
        self.changeStream = nil
6
    }
7
    if enabledChangeStreams {
8
        do {
9
            let changeStreamOptions = ChangeStreamOptions(fullDocument: .updateLookup)
10
            changeStream = try await collection?.watch(options: changeStreamOptions)
11
            _ = changeStream?.forEach({ changeEvent in
12
                withAnimation {
13
                    latestChangeEvent = changeEvent
14
                    showingChangeEvent = true
15
                    Task {
16
                        await loadDocs()
17
                    }
18
                }
19
            })
20
        } catch {
21
            errorMessage = "Failed to register change stream: \(error.localizedDescription)"
22
        }
23
    }
24
}

1
 ChangeEventView(event: latestChangeEvent)

1
let event: ChangeStreamEvent<BSONDocument>

1
var color: Color {
2
    switch event.operationType {  
3
    case .insert:
4
        return .green
5
    case .update:
6
        return .yellow
7
    case .replace:
8
        return .orange
9
    case .delete:
10
        return .red
11
    default:
12
        return .teal
13
    }
14
}

1
if let documentKey = event.documentKey {
2
   ...
3
        Text(documentKey.toPrettyJSONString())
4
   ...
5
    }
6
}

1
if let updateDescription = event.updateDescription {
2
    ...
3
        Text(updateDescription.updatedFields.toPrettyJSONString())
4
    ...
5
    }
6
}

1
if let fullDocument = event.fullDocument {
2
    ...
3
        Text(fullDocument.toPrettyJSONString())
4
    ...
5
    }
6
}