configurePersistentStoreCoordinator not called for saveAs NSPersistentDocument

Question

I experience an odd behaviour regarding saving an NSPersistentDocument. I can create a new document which is autosaved without an issue. But when I save it write(to: ofTyp

Answer 1

Could you try this nasty workaround?

class CustomPersistentStoreCoordinator : NSPersistentStoreCoordinator {

  static var m1 : Method? = nil
  static var m2 : Method? = nil

  override func migratePersistentStore(_ store: NSPersistentStore, to URL: URL, options: [AnyHashable : Any]? = nil, withType storeType: String) throws -> NSPersistentStore {
    var opt: [AnyHashable : Any] = options ?? [:]

    if #available(OSX 10.13, *) {
      opt[NSBinaryStoreSecureDecodingClasses] = NSSet(array: [ NSColor.self ])
    }

    let m1 = CustomPersistentStoreCoordinator.m1!
    let m2 = CustomPersistentStoreCoordinator.m2!
    method_exchangeImplementations(m2, m1)

    let x = try self.migratePersistentStore(store, to: URL, options: opt, withType: storeType)

    method_exchangeImplementations(m1, m2)
    return x
  }
}

class Document: NSPersistentDocument {

  override init() {
    super.init()

    let s1 = #selector(NSPersistentStoreCoordinator.migratePersistentStore(_:to:options:withType:))
    let s2 = #selector(CustomPersistentStoreCoordinator.migratePersistentStore(_:to:options:withType:))
    let m1 = class_getInstanceMethod(NSPersistentStoreCoordinator.self, s1)!
    let m2 = class_getInstanceMethod(CustomPersistentStoreCoordinator.self, s2)!
    CustomPersistentStoreCoordinator.m1 = m1
    CustomPersistentStoreCoordinator.m2 = m2
    method_exchangeImplementations(m1, m2)
  }

  override func configurePersistentStoreCoordinator(for url: URL, ofType fileType: String, modelConfiguration configuration: String?, storeOptions: [String : Any]? = nil) throws {
    // keep yours
  }

}