Firestore iOS: Exception when using UpdateData in Transaction with dictionary as input arguments

[weinamdev]

Hi,

This issue is very similar to #520 , it happens on TransactionWrapper.UpdateData(IDocumentReference document, Dictionary<object, object> data)

Using code below, crate a document then update the document using TransactionWrapper.UpdateData, exception thrown on iOS, but no issue on android.

Thank you.

  var db = CrossFirebaseFirestore.Current;
  DateTimeOffset dateOnly = DateTimeOffset.Now;

  var doc5 = db.GetCollection("zzz").GetDocument("doc5");
  var data5 = new Dictionary<object, object>();
  data5.Add("DateField", dateOnly);
  data5.Add("FBFVField", FieldValue.ArrayUnion("Sub 1"));
  await doc5.SetDataAsync(data5, SetOptions.Merge());

  // Test 5: Working on Android, not working on iOS
  var doc5 = db.GetCollection("zzz").GetDocument("doc5");
  var data5 = new Dictionary<object, object>();
  data5.Add("FBFVField2", FieldValue.ArrayUnion("Sub 2"));
  data5.Add("DateField2", dateOnly);
  bool IsSuccess = true;
  await db.RunTransactionAsync<IFirestoreObject>(trans =>
  {
      try
      {
          _ = trans.UpdateData(doc5, data5);
      }
      catch (Exception ex)
      {
          ErrorLogger.Log(ex);
      }
      return null;

  }).ContinueWith(async t =>
  {
      if (t.IsCompleted)
      {
          IsSuccess &= t.Status == TaskStatus.RanToCompletion;
          if (!IsSuccess)
          {
              ErrorLogger.Log($"Transaction Failed! {t.Exception}");
          }
      }
  });

<System.ArgumentException>: System.ArgumentException: Do not know how to marshal object of type 'Plugin.Firebase.Firestore.FieldValue' to an NSObject
   at Foundation.NSArray.From[Object](Object[] items, Int64 count) in /Users/builder/azdo/_work/1/s/xamarin-macios/src/Foundation/NSArray.cs:line 161
   at Foundation.NSArray.FromObjects(IntPtr count, Object[] items) in /Users/builder/azdo/_work/1/s/xamarin-macios/src/Foundation/NSArray.cs:line 144
   at Foundation.NSDictionary`2[[Foundation.NSObject, Microsoft.iOS, Version=18.0.0.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065],[Foundation.NSObject, Microsoft.iOS, Version=18.0.0.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065]].FromObjectsAndKeys(Object[] objects, Object[] keys, IntPtr count) in /Users/builder/azdo/_work/1/s/xamarin-macios/src/Foundation/NSDictionary_2.cs:line 237
   at Firebase.CloudFirestore.Transaction.UpdateData(Dictionary`2 fields, DocumentReference document)
   at Plugin.Firebase.Firestore.Platforms.iOS.TransactionWrapper.UpdateData(IDocumentReference document, Dictionary`2 data)