Exists or 0

[arabiancoder]

In selections, ID should be exists or 0 for roots!
For example in category, there is parent_id column, so, in root categories parent_id is 0.
I have been searching for such exists_or_zero validation method with no success.

[ghost]

Just to confirm, are you asking for a new validation rule that does what you describe?

[ghost]

Personally, I think this is too application-specific as it assumes that the ID field is an integer. It could easily be a string e.g. a UUID, or a number of a certain padded length e.g. 0000001.

For this reason, I think I'm going to close this. If you have any additional feedback, then please let me know and I'll reconsider your request :)