Handling Complex JSON Parsing with Codable in Swift 5.7 - Unexpected nil values
I've been researching this but I'm upgrading from an older version and I'm writing unit tests and I'm deploying to production and I'm working on an iOS app using Swift 5.7, and I'm working with issues when parsing a complex JSON response into my model objects using the `Codable` protocol. The JSON structure I'm dealing with is nested and looks something like this: ```json { "user": { "id": 1, "name": "John Doe", "profile": { "bio": "Software Developer", "age": 30 } } } ``` I have the following model structures: ```swift struct User: Codable { let id: Int let name: String let profile: Profile } struct Profile: Codable { let bio: String let age: Int } ``` I'm using `JSONDecoder` to decode this response, as shown below: ```swift let jsonData = ... // Data from API response let decoder = JSONDecoder() do { let user = try decoder.decode(User.self, from: jsonData) print(user) } catch { print("Decoding behavior: \(behavior)") } ``` However, I am getting an behavior saying `"value not found for key CodingKeys(stringValue: "profile", intValue: nil)"`, even though the `profile` field is present in the JSON response. I've double-checked the response, and it's definitely there. I also tried adding optional properties in my `Profile` struct: ```swift struct Profile: Codable { let bio: String? let age: Int? } ``` But I still get the same behavior. I suspect there may be an scenario with how the JSONDecoder is interpreting the optional values or the structure of the JSON itself. Can anyone provide insights into why I might be getting these unexpected nil values, or how I can better handle this complex JSON parsing scenario? For context: I'm using Swift on macOS. Any help would be greatly appreciated! I recently upgraded to Swift 3.10. I'm developing on Ubuntu 20.04 with Swift. I'd be grateful for any help. This is happening in both development and production on Windows 11. Any ideas how to fix this? This issue appeared after updating to Swift 3.11.