Throwable Response

ThrowableResponse.swift

struct Response {
    let items: [Widget]
}

extension Response: Decodable {
    enum CodingKeys: CodingKey {
        case items
    }
    
    init(from decoder: Decoder) throws {
        let container = try decoder.container(keyedBy: CodingKeys.self)
        
        let items = try container
            .decode([Throwable<Widget>].self, forKey: .items)
            .compactMap { $0.get() }
        
        guard !items.isEmpty else {
            throw ResponseDecodingError.noWidgets
        }
        
        self.items = items
    }
}

enum ResponseDecodingError: Error {
    case noWidgets
}