SwiftData crashes 100% when fetching history of a model that contains an optional codable property that's updated:
SwiftData/Schema.swift:389: Fatal error: Failed to materialize a keypath for someCodableID.someID from CrashModel. It is possible that this path traverses a type that does not work with append(), please file a bug report with a test.
Would really appreciate some help or even a workaround.
Code:
import Foundation
import SwiftData
import Testing
struct VaultsSwiftDataKnownIssuesTests {
@Test
func testCodableCrashInHistoryFetch() async throws {
let container = try ModelContainer(
for: CrashModel.self,
configurations: .init(
isStoredInMemoryOnly: true
)
)
let context = ModelContext(container)
try SimpleHistoryChecker.hasLocalHistoryChanges(context: context)
// 1: insert a new value and save
let model = CrashModel()
model.someCodableID = SomeCodableID(someID: "testid1")
context.insert(model)
try context.save()
// 2: check history it's fine.
try SimpleHistoryChecker.hasLocalHistoryChanges(context: context)
// 3: update the inserted value before then save
model.someCodableID = SomeCodableID(someID: "testid2")
try context.save()
// The next check will always crash on fetchHistory with this error:
/*
SwiftData/Schema.swift:389: Fatal error: Failed to materialize a keypath for someCodableID.someID from CrashModel. It is possible that this path traverses a type that does not work with append(), please file a bug report with a test.
*/
try SimpleHistoryChecker.hasLocalHistoryChanges(context: context)
}
}
@Model final class CrashModel {
// optional codable crashes.
var someCodableID: SomeCodableID?
// these actually work:
//var someCodableID: SomeCodableID
//var someCodableID: [SomeCodableID]
init() {}
}
public struct SomeCodableID: Codable {
public let someID: String
}
final class SimpleHistoryChecker {
static func hasLocalHistoryChanges(context: ModelContext) throws {
let descriptor = HistoryDescriptor<DefaultHistoryTransaction>()
let history = try context.fetchHistory(descriptor)
guard let last = history.last else {
return
}
print(last)
}
}
0
0
98