Cant parse JSON (nested dictionary) into ForEach with SwiftUI - ios

Question

I want to parse the following JSON into a list with SwiftUI, however I am experiencing some issues with this.
JSON (there are many more entires than this with random Identifiers as the entry. This is what caused it to be much harder to perform):
{
"DCqkboGRytms": {
"name": "graffiti-brush-3.zip",
"downloads": "5",
"views": "9",
"sha256": "767427c70401d43da30bc6d148412c31a13babacda27caf4ceca490813ccd42e"
},
"gIisYkxYSzO3": {
"name": "twitch.png",
"downloads": "19",
"views": "173",
"sha256": "aa2a86e7f8f5056428d810feb7b6de107adefb4bf1d71a4ce28897792582b75f"
},
"bcfa82": {
"name": "PPSSPP.ipa",
"downloads": "7",
"views": "14",
"sha256": "f8b752adf21be6c79dae5b80f5b6176f383b130438e81b49c54af8926bce47fe"
}
}
SwiftUI Codables:
struct Feed: Codable {
let list: [FeedValue]
}
struct FeedValue: Codable, Identifiable {
var id = UUID()
let name, downloads, views, sha256: String
}
JSON Fetch method (and parse):
func getFeeds(completion:#escaping (Feed) -> ()) {
// URL hidden to respect API privacy
guard let url = URL(string: "") else { return }
URLSession.shared.dataTask(with: url) { (data, _, _) in
let feed = try! JSONDecoder().decode(Feed.self, from: data!)
DispatchQueue.main.async {
completion(feed)
}
}.resume()
}
Finally, the view containing my ForEach loop:
struct HomeView: View {
#State private var scrollViewContentOffset: CGFloat = .zero
#State var listFeed = Feed(list: [])
var body: some View {
// Z-coord status bar holder
ZStack(alignment: .top) {
TrackableScrollView(.vertical, showIndicators: true, contentOffset: $scrollViewContentOffset) {
// Public files Start
LazyVStack(spacing: 0) { {
// Withholds our content for each asset retrieved.
// Main part
ForEach(listFeed.list, id: \.id) { download in
AssetView(name: .constant(download.name), downloads: .constant(download.downloads), views: .constant(download.views))
}
}.padding([.leading, .top, .trailing], 25)
// Public files End
}.edgesIgnoringSafeArea([.leading, .trailing, .top])
}.background(Color.backgroundColor.ignoresSafeArea())
.onAppear() {
getFeeds { feed in
//print(feed) : this did happen to work at the time of testing
self.listFeed = feed
}
}
}
}
And for the error that is being presented:
Starfiles/HomeView.swift:32: Fatal error: 'try!' expression unexpectedly raised an error: Swift.DecodingError.keyNotFound(CodingKeys(stringValue: "list", intValue: nil), Swift.DecodingError.Context(codingPath: [], debugDescription: "No value associated with key CodingKeys(stringValue: "list", intValue: nil) ("list").", underlyingError: nil))
I've spent several hours today changing the method of parsing, but was unable to find a solution on my own.
EDIT 1: I would like to mention that I need a way to access the dictionary ID's as well, as they'll be used for entering in a new view.
EDIT 2: Using what #jnpdx provided, JSON parsing now works as expectedly, and gets the information I need. However there's an issue with ForEach loops, the same one which persisted before (It does work in a List(), as his answer showed).
Here is the updated code (not going to show any code that's irrelevant)
ForEach(listItems) { item in // Cannot convert value of type '[IdentifiableFeedValue]' to expected argument type 'Binding<C>' & Generic parameter 'C' could not be inferred
AssetView(name: .constant(item.feedValue.name), // Cannot convert value of type 'Binding<Subject>' to expected argument type 'String'
downloads: .constant(item.feedValue.downloads), views: .constant(item.feedValue.views))
}.onAppear() {
// URL hidden to respect API privacy, refer to JSON above.
guard let url = URL(string: "") else { return }
URLSession.shared.dataTask(with: url) { (data, _, _) in
do {
list = try JSONDecoder().decode([String:FeedValue].self, from: data!)
} catch {
print("error")
}
}.resume()
}
// AssetView
struct AssetView: View {
#Binding var name: String
#Binding var downloads: String
#Binding var views: String
...
}

Answer 1

Your JSON doesn't have any keys called list, which is why it's failing. Because it's a dynamically-keyed dictionary, you will want to decode it as [String:FeedValue].
I used a wrapper to keep the id from the original JSON, but you could also do some fancier decoding if you wanted to keep it in a one-level struct, but that's beyond the scope of this question.
let jsonData = """
{
"DCqkboGRytms": {
"name": "graffiti-brush-3.zip",
"downloads": "5",
"views": "9",
"sha256": "767427c70401d43da30bc6d148412c31a13babacda27caf4ceca490813ccd42e"
},
"gIisYkxYSzO3": {
"name": "twitch.png",
"downloads": "19",
"views": "173",
"sha256": "aa2a86e7f8f5056428d810feb7b6de107adefb4bf1d71a4ce28897792582b75f"
},
"bcfa82": {
"name": "PPSSPP.ipa",
"downloads": "7",
"views": "14",
"sha256": "f8b752adf21be6c79dae5b80f5b6176f383b130438e81b49c54af8926bce47fe"
}
}
""".data(using: .utf8)!
struct FeedValue: Codable {
let name, downloads, views, sha256: String
}
struct IdentifiableFeedValue : Identifiable {
let id: String
let feedValue: FeedValue
}
struct ContentView: View {
#State var list : [String:FeedValue] = [:]
var listItems: [IdentifiableFeedValue] {
list.map { IdentifiableFeedValue(id: $0.key, feedValue: $0.value) }
}
var body: some View {
List(listItems) { item in
Text(item.feedValue.name)
}.onAppear {
do {
list = try JSONDecoder().decode([String:FeedValue].self, from: jsonData)
} catch {
print(error)
}
}
}
}