I want to use a field made of add field, but it is treated as a null value. I want to know the reason why.
- I made the last Exercise field.
- I want to use the field for the last Exercise field.
- The value is null.
I want to use a field made of add field, but it is treated as a null value. I want to know the reason why.
Welcome on board @Hyunjun_Cho. It could be possible that’s the very last item on you collection has null value. Could you post some sample data in here? better if you can make a sandbox on https://mongoplayground.net/.
Thank you
Thank you for your answer.
The cause was due to the null value.