That may not be the best way to explain it. Essentially, I'm requesting data from Reddit and storing it in an object called Request. This object has a timestamp and an array of objects called Post. Everything was working fine until I started to add some code to filter the post that were being fetched from reddit.
extension [Request] {
func insert(request: Request, in context: ModelContext) {
if self.count == 0 {
context.logMessage("There are no existing request")
context.insert(request)
context.logMessage("Request saved")
}else {
print(request) // No crash
print(request.timestamp) // No crash
print(request.posts) // Causes a crash
}
}
}
When it does crash, it points to this code inside the SwiftData model. This code seems to be something within SwiftData. I didn't write any of this.
{
@storageRestrictions(accesses: _$backingData, initializes: _posts)
init(initialValue) {
_$backingData.setValue(forKey: \.posts, to: initialValue)
_posts = _SwiftDataNoType()
}
get {
_$observationRegistrar.access(self, keyPath: \.posts)
return self.getValue(forKey: \.posts)
}
set {
_$observationRegistrar.withMutation(of: self, keyPath: \.posts) {
self.setValue(forKey: \.posts, to: newValue)
}
}
}
It has the error at the return self.getValue() line: Thread 5: EXC_BREAKPOINT (code=1, subcode=0x2406965c4)
This is the sequence that occurs:
- View is loaded
- Checks if it should load a new request
- If it should, it calls this function
private func requestNewData() {
redditService.fetchRedditAllData(completion: { result in
DispatchQueue.main.async {
switch result {
case .success(let newRequest):
modelContext.logMessage("Successfully retreived and decoded data from Reddit") // Log the success
//modelContext.insert(newRequest)
requests.insert(request: newRequest, in: modelContext)
case .failure:
modelContext.logMessage("Failed to retrieve and decode data from Reddit")
}
}
})
}
The code for the fetch function is here:
func fetchRedditAllData(completion: @escaping (Result<Request, Error>) -> Void) {
// Try to construct the URL and return if it fails
guard let url = URL(string: RedditRequests.all) else {
context.logMessage("Failed to contruct the url for r/all")
return
}
// Try to retrieve data from the URL
session.dataTask(with: url, completionHandler: { data, _, error in
// If it fails, log the failure
if let error = error {
self.context.logMessage("Failed to retrieve data from the r/all URL.\n\(error.localizedDescription)")
} else {
// If it doesn't fail, try to decode the data
do {
let data = data ?? Data() // Get data
let response = try self.decoder.decode(Request.self, from: data) // Decode JSON into Request model
completion(.success(response)) // Return response (request) if successful
self.context.logMessage("Decoded data")
}
catch {
completion(.failure(error))
self.context.logMessage("Failed to decode data into a Request.\n\(error.localizedDescription)")
}
}
}).resume()
}
If I don't try to access request.posts before saving it to the context, it works fine. It will fetch the data and store it to the phone and then display it on the phone. When I try to access request.posts to do some filtering, it crashes.
Does anyone have any ideas?