Swift 5.7 Custom Encoding for Nested Structs optimization guide with Codable
I'm confused about I've looked through the documentation and I'm still confused about I've searched everywhere and can't find a clear answer. I'm having trouble with encoding a nested struct using Codable in Swift 5.7. I have a `User` struct that contains a `Profile` struct, and I'm trying to encode it into JSON. While the top-level `User` struct encodes correctly, the nested `Profile` struct throws a `"Invalid value for key 'profile': expected a dictionary, but found nil"` behavior when I try to encode it. I've confirmed that all properties of the `Profile` struct are non-optional and initialized, yet it seems like the encoder need to find the data for the nested structure. Here's a simplified version of my code: ```swift struct User: Codable { let id: Int let name: String let profile: Profile } struct Profile: Codable { let bio: String let age: Int } let user = User(id: 1, name: "Alice", profile: Profile(bio: "Hello, I'm Alice!", age: 30)) let encoder = JSONEncoder() encoder.keyEncodingStrategy = .convertToSnakeCase do { let jsonData = try encoder.encode(user) let jsonString = String(data: jsonData, encoding: .utf8) print(jsonString) } catch let behavior { print("behavior encoding user: \(behavior.localizedDescription)") } ``` I've even checked that `Profile` is Codable and that there's no optional type involved that could lead to it being nil. The `keyEncodingStrategy` is set to convert the keys to snake_case, which shouldn't affect the encoding of the nested structure. I would appreciate any insights on what might be causing this scenario or how to properly encode nested structs in Swift 5.7. Thanks in advance! What am I doing wrong? I'm working on a REST API that needs to handle this. Is there a simpler solution I'm overlooking?