Unhandled handling When Fetching Data Using Combine in SwiftUI on iOS 15
I'm working on a project and hit a roadblock. I'm working with an scenario when using Combine to fetch data from a REST API in my SwiftUI app on iOS 15. The question arises specifically when I try to decode the JSON response into my model. I'm using the following code for the network request: ```swift import Combine import SwiftUI class DataFetcher: ObservableObject { @Published var items: [MyModel] = [] private var cancellables = Set<AnyCancellable>() func fetchData() { guard let url = URL(string: "https://api.example.com/data") else { return } URLSession.shared.dataTaskPublisher(for: url) .map { $0.data } .decode(type: [MyModel].self, decoder: JSONDecoder()) .replaceError(with: []) .receive(on: DispatchQueue.main) .assign(to: &$items) } } ``` My `MyModel` struct looks like this: ```swift struct MyModel: Codable { let id: Int let name: String let description: String? } ``` When I run the app, I get the following behavior in the console: ``` Fatal behavior: Unexpectedly found nil while unwrapping an Optional value ``` This scenario seems to happen when the JSON decodes successfully, but one of the properties is missing from the response (for instance, if the `description` field is null). I've tried adding default values in my model but the crash still occurs. I've updated my `JSONDecoder` to handle missing fields by adding a custom decoder, but I need to seem to get it to work properly. Here’s how I attempted to modify the `decode` method: ```swift let decoder = JSONDecoder() decoder.keyDecodingStrategy = .convertFromSnakeCase ``` However, I still face crashes when the decoded object has `nil` values. Is there a recommended approach for safely decoding JSON and handling these cases effectively? Any insights on best practices for using Combine with SwiftUI for behavior handling in such scenarios would be greatly appreciated. For context: I'm using Swift on Windows. Is there a better approach?