How would you solve this Codable issue?

Using Swift
6

I see, so you message contains routing-related keys, and module related keys, both keys are on the same level.
You want to extract all routing-related keys, remove it, then pass the rest onto the next part of the program.

If the structure on module-related and routing-related keys are fixed. I’d suggest that you include both in a single Codable anyway. Codable is designed so that you want to have one struct for each point of conversion between data, and internal representation, reusing some sub-structure if possible. Something like this

struct FullMessageData {
  // Both routing data & module data
}

struct RoutingData {
  // Routing data only
}

struct ModuleData {
  // Module data only
}

let fullMessage: FullMessageData = ...
let routingData = fullMessage.routingData
let moduleData = fullMessage.moduleData

If the message logic makes it too cumbersome. Another way is to parse the data twice, once as RoutingData, again as ModuleData.
Because you’re not done with parsing when in routing progam, you’ll want to pass the entire message to the module, and have it ignore the routing keys.

struct RoutingData { ... }
struct ModuleData { ... }

let routingData = JSONDecoder.decode(RoutingData.self, ...)
let moduleData = JSONDecoder.decode(ModuleData.self, ...)

If all else fails, you can still use JSONSerialization which IMO isn’t exactly Swifty, but does exactly what you need.

1 Like