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Questions tagged [decodable]

Use this tag only for questions directly pertaining to the Swift Decodable protocol introduced in Swift 4.

678 questions
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4 answers

How to parse JSON with Decodable protocol when property types might change from Int to String?

I have to decode a JSON with a big structure and a lot of nested arrays. I have reproduced the structure in my UserModel file, and it works, except with one property (postcode) that is in a nested array (Location) that sometimes is an Int and some…
Alfro
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Swift JSON variables with all numeric names. What's the work around?

I am pulling some JSON data that I need to parse using Decodable into Swift. As most of the data is dates I have 365 date entries along the lines of: "20170101": 0.17, "20170102": 1.0, "20170103": 0.68, "20170104": 0.61, "20170105": 1.03,…
Edward Hasted
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How to make a struct conforms to a protocol which has a property conforms to another protocol in swift 4?

I was going to reflect some JSON data from web service into swift struct. So I created a protocol which conforms to decodable protocol and planed to create some structs to conform it. This is the protocol I had created: protocol XFNovelApiResponse:…
Rabbit Zhou
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How do I do a partial update in Realm using `Decodable` object without data loss?

I have an JSON-API that returns me arrays of Courses. The Courses have CourseLocations, CourseTypes etc. All of them have primary keys. I thought it would be great to parse everything using Codable and to update it using…
Jarod
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3 answers

Unit testing conformance to Decodable using a SingleValueDecodingContainer

So, I have a type which looks like this: struct Identifier { let string: String } extension Identifier: Decodable { public init(from decoder: Decoder) throws { let container = try decoder.singleValueContainer() string = try…
vrutberg
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How to decode a nested JSON with many unique keys in Swift?

My questions is what is the best method I could use to decode a JSON that has many different keys? Right now, I am creating a var for every single one. This seems inefficient/hard coding, and I have about 8 different menus like this to decode. Here…
winstonj
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Swift JSONDecoder decode Int64 on iOS 10

There is a bug in iOS 10, that Swift 4's JSONDecoder does not decode some huge 64 bit integers from JSON with error "Parsed JSON number <1522853867156381000> does not fit in Int64." This is not happening in iOS 11 and it is a known bug None of…
shelll
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Subclassing swift generic decodable type

EDIT: As Rob Napier wrote, the problem exists in Xcode 9.2. In Xcode 9.3 the issue is no longer relevant. My server json responses are all packed inside data object: { "data": {...} } So I have the following generic type to parse JSON: class…
NShiny
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Swift decodable propagate userInfo

I have the following models: struct Shop: Decodable { let id: Int let name: String let products: [Product] private enum CodingKeys: String, CodingKey { case id case name case products } init(from…
nikmin
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2 answers

Decoding JSON array of different types in Swift

I'm trying to decode the following JSON Object { "result":[ { "rank":12, "user":{ "name":"bob","age":12 } }, { "1":[ …
TheBearF8
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Extracting data from JSON array with swift Codable

I have a JSON response like this: I have currently designed my decodable struct to be as follows: struct PortfolioResponseModel: Decodable { var dataset: Dataset struct Dataset: Decodable { var data: Array //I…
Mehul Parmar
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JSONEncoder and PropertyListEncoder don't conform to Encoder?

I am trying to write an Encoder/Decoder pair that wraps an given Encoder/Decoder. The goal of this wrapper is to successfully handle cyclic references (which neither JSONEncoder nor PropertyListEncoder do), and delegate the actual encoding/decoding…
Alexander
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2 answers

Model relations based on a key in the attributes of a Swift Decodable object

Given the JSON: [{ "name": "TV", "room": "Living Room" }, { "name": "LightBulb 1", "room": "Living Room" } ] struct Room: Decodable { let name: String let devices: [Device] } struct Device: Decodable…
bogen
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How to write a Decodable for a JSON in Swift 4, where keys are dynamic?

I've a JSON like this. I need to make a corresponding Decodable struct in my iOS app using Swift 4. { "cherry": { "filling": "cherries and love", "goodWithIceCream": true, "madeBy": "my grandmother" }, "odd":…
iranjith4
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Decode PropertyList using Swift 4 Codable PropertyListDecoder()

Im trying to decode a plist using PropertyListDecoder() but when I get to the trying to access the keys, I get an error that says it's in the wrong format. I'm at a loss on what I'm doing wrong. Im under the assumption I can decode a Plist file the…
SirCJ
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