Error when trying to update entity

[oco-adam]

Hi,

I've been trying to use the library, but I'm confused with some behaviour around updating entities.

In particular I'm getting an error of the form "Attempt to access an object not found in store", when I try and update an entity.

Here is a minimal example of the strange behaviour, which you should be able to reproduce easily in the context of the CoreDataRepositoryTests:

  func testUpdateMovie() async throws {
    let container = CoreDataStack.persistentContainer
    let repositoryContext = container.viewContext
    repositoryContext.automaticallyMergesChangesFromParent = true
    let repo = CoreDataRepository(context: repositoryContext)
    
    let movie = Movie(id: UUID(), title: "Some Movie", releaseDate: Date())
    
    // We can create a movie
    let createRes = await repo.create(movie)
    let createdMovie = try! createRes.get()
    
    // We can then fetch the movie, e.g. by its title
    let fetchRequest = NSFetchRequest<RepoMovie>(entityName: "RepoMovie")
    fetchRequest.predicate = NSPredicate(format: "title == %@", movie.title)
    let fetchRes: Result<[Movie], CoreDataRepositoryError> = await repo.fetch(fetchRequest)
    let fetchedMovie = try fetchRes.get().first!
    print("Fetched Movie", fetchedMovie)
    
    // But if we try and update the movie we get a failure
    var updatedMovie = createdMovie
    updatedMovie.title = "Updated title"
    let updateRes = await repo.update(updatedMovie.managedRepoUrl!, with: updatedMovie)
    let _ = try! updateRes.get()
    
//    Fatal error: 'try!' expression unexpectedly raised an error: 
//    CoreDataRepository.CoreDataRepositoryError.coreData(Error Domain=NSCocoaErrorDomain Code=133000 
//    "Attempt to access an object not found in store."
  }

It is quite possible that I'm just using the library incorrectly, so any assistance with what I'm doing wrong would be most appreciated.

[roanutil]

I started looking into this last night but haven't finished. The error returned is claiming that the NSManagedObjectID is a temporary one although that doesn't seem to be true. I suspect there is a problem of contexts not syncing with each other after a save.

I look into it more asap.