How to parse an empty dictionary object in Argo

[wongzigii]

Seem like Argo cannot handle the empty dictionary situation corrrectly.
In this case, I try to parse this JSON into User and then check if the userInfo is empty.

Sample JSON

{
  "name": "Li",
  "userInfo": {}
}

Models

All models involved, including their Decodable implementations.

struct User {
  var name: String
  var userInfo: UserInfo
}

extension User: Argo.Decodable {
    public static func decode(_ json: JSON) -> Decoded<User> {
        return curry(User.init)
            <^> json <| "name"
            <*> json <| "userInfo"  // or json <|? "userInfo" both not work
    }
}

Argo Version

example: Argo 3.0.0

Dependency Manager

examples: Carthage, Cocoapods, git submodules, copied code, etc.

[gfontenot]

Hey there!

We do support decoding dictionaries, assuming that the dictionary has String keys and Decodable values. It also needs to be a homomorphic dictionary, we can't decode to [String: Any]. If that fits your use case, then you can use decodeObject (or [String: T].decode if you prefer). We don't expose an operator for it, but it's straightforward to plug in using flatMap (or >>-):

struct User {
  var name: String
  var userInfo: UserInfo
}

extension User: Argo.Decodable {
    public static func decode(_ json: JSON) -> Decoded<User> {
        return curry(User.init)
            <^> json <| "name"
            <*> (json <| "userInfo")  >>- decodeObject
    }
}