:put but only if does not exist

[dcz-self]

Currently, the documentation states that :put will overwrite the original keys if those match.

That's not great if I want to keep data from overwriting, e.g. if a resource exists under that name, I don't want to clobber it.

How to do this atomically in cozo? I tried to mess with the % syntax to do %if exists %then :put % else nothing, but that immediately crashed inside cozo.

[zh217]

If you are running the latest version, there is another set of mutations :insert, :update and :delete which does what you expect from SQL. You can use imperative ops, but it is no longer necessary and quite a bit faster. Yes the docs need more work.

[zh217]

And if by "crash" you mean "panic", can you share the script that caused it? All panics are bugs.

[dcz-self]

I do mean panic, but I don't have the code any more. It was similar to #131 . I can't reproduce it because I don't understand the imperative documentation, and I keep getting syntax errors.