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Throwable example usage!
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import Foundation | |
// MARK: - Throwable | |
struct Throwable<T: Decodable>: Decodable { | |
private let result: Result<T, Error> | |
init(from decoder: Decoder) throws { | |
do { | |
result = .success(try T(from: decoder)) | |
} catch let error { | |
// additionally, logError(error) | |
result = .failure(error) | |
} | |
} | |
func get() -> T? { | |
try? result.get() | |
} | |
} | |
// MARK: - Response | |
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 | |
} | |
// MARK: - Widget | |
enum Widget { | |
case headerWidget(HeaderWidget) | |
case cardWidget(CardWidget) | |
case buttonWidget(ButtonWidget) | |
} | |
extension Widget: Decodable { | |
enum `Type`: String, Decodable { | |
case headerWidget = "HeaderWidget" | |
case cardWidget = "CardWidget" | |
case buttonWidget = "ButtonWidget" | |
} | |
enum CodingKeys: String, CodingKey { | |
case type | |
} | |
init(from decoder: Decoder) throws { | |
let container = try decoder.container(keyedBy: CodingKeys.self) | |
let type = try container.decode(`Type`.self, forKey: .type) | |
switch type { | |
case .headerWidget: | |
self = .headerWidget(try HeaderWidget(from: decoder)) | |
case .cardWidget: | |
self = .cardWidget(try CardWidget(from: decoder)) | |
case .buttonWidget: | |
self = .buttonWidget(try ButtonWidget(from: decoder)) | |
} | |
} | |
} | |
// MARK: - Models | |
struct HeaderWidget: Decodable { | |
let title: String | |
let subtitle: String | |
} | |
struct CardWidget: Decodable { | |
let title: String | |
let image: URL | |
let operation: URL | |
} | |
struct ButtonWidget: Decodable { | |
let title: String | |
let operation: URL | |
} | |
let data: Data = """ | |
{ | |
"items": [ | |
{ | |
"type": "HeaderWidget", | |
"title": "Hello world", | |
"subtitle": "Lorem ipsum" | |
}, | |
{ | |
"type": "ChartWidget", | |
"title": "Your expenses path through the month", | |
"data": [3.72, 9.43, 13.72, 16.21, 25.04, 27.95] | |
}, | |
{ | |
"type": "CardWidget", | |
"title": "Your top visits", | |
"image": "www.example.com", | |
"operation": "app://purchase" | |
}, | |
{ | |
"type": "ButtonWidget", | |
"title": "Subscribe", | |
"operation": "app://subscribe" | |
} | |
] | |
} | |
""".data(using: .utf8)! | |
let response = try JSONDecoder().decode(Response.self, from: data) |
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