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Swift Nested JSON Decoding example
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import Foundation | |
struct EvolutionProposal: Codable { | |
var id: String | |
var title: String | |
var reviewStartDate: Date | |
var reviewEndDate: Date | |
enum CodingKeys: String, CodingKey { | |
case id | |
case title | |
case metadata | |
enum MetadataCodingKeys: String, CodingKey { | |
case reviewStartDate | |
case reviewEndDate | |
} | |
} | |
init(from decoder: Decoder) throws { | |
let rootContainer = try decoder.container(keyedBy: CodingKeys.self) | |
let metadataContainer = try rootContainer.nestedContainer(keyedBy: CodingKeys.MetadataCodingKeys.self, forKey: .metadata) | |
id = try rootContainer.decode(String.self, forKey: .id) | |
title = try rootContainer.decode(String.self, forKey: .title) | |
reviewStartDate = try metadataContainer.decode(Date.self, forKey: .reviewStartDate) | |
reviewEndDate = try metadataContainer.decode(Date.self, forKey: .reviewEndDate) | |
} | |
func encode(to encoder: Encoder) throws { | |
var rootContainer = encoder.container(keyedBy: CodingKeys.self) | |
var metadataContainer = rootContainer.nestedContainer(keyedBy: CodingKeys.MetadataCodingKeys.self, forKey: .metadata) | |
try rootContainer.encode(id, forKey: .id) | |
try rootContainer.encode(title, forKey: .title) | |
try metadataContainer.encode(reviewStartDate, forKey: .reviewStartDate) | |
try metadataContainer.encode(reviewEndDate, forKey: .reviewEndDate) | |
} | |
} | |
let json = """ | |
{ | |
"id": "SE-0274", | |
"title": "Concise magic file names", | |
"metadata": { | |
"review_start_date": "2020-01-08T00:00:00Z", | |
"review_end_date": "2020-01-16T00:00:00Z" | |
} | |
} | |
""" | |
let decoder = JSONDecoder() | |
decoder.dateDecodingStrategy = .iso8601 | |
decoder.keyDecodingStrategy = .convertFromSnakeCase | |
try decoder.decode(EvolutionProposal.self, from: Data(json.utf8)) |
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