I'm writing some tests to confirm the behavior of my app. White creating a model actor to delete objects I realized that ModelContext.model(for:) does return objects that are deleted. I was able to reproduces this with this minimal test case:
@Model class Activity {
init() {}
}
struct MyLibraryTests {
let modelContainer = try! ModelContainer(
for: Activity.self,
configurations: ModelConfiguration(
isStoredInMemoryOnly: true
)
)
init() throws {
let context = ModelContext(modelContainer)
context.insert(Activity())
try context.save()
}
@Test func modelForIdAfterDelete() async throws {
let context = ModelContext(modelContainer)
let id = try context.fetch(FetchDescriptor<Activity>()).first!.id
context.delete(context.model(for: id) as! Activity)
try context.save()
let result = context.model(for: id) as? Activity
#expect(result == nil) // Expectation failed: (result → MyLibrary.Activity) == nil
}
@Test func fetchDescriptorAfterDelete() async throws {
let context = ModelContext(modelContainer)
let id = try context.fetch(FetchDescriptor<Activity>()).first!.id
context.delete(context.model(for: id) as! Activity)
try context.save()
let result = try context.fetch(
FetchDescriptor<Activity>(predicate: #Predicate { $0.id == id })
).first
#expect(result == nil)
}
}
Here I create a new context, insert an model and save it.
The test modelForIdAfterDelete does fail, as result still contains the deleted object.
I also tried to check #expect(result!.isDeleted), but it is also false.
With the second test I use a FetchDescriptor to retrieve the object by ID and it correctly returns nil.
Shouldn't both methods use a consistent behavior?
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