Hi Jeremy and Tobias,
I always expect *has[foo]* to contain tiddlers even if the value of
*foo* is empty.
I guess that's just me.
I agree that it’s strange. Looking at the code, the extra check for
the field being empty was added explicitly in January last year:
https://github.com/Jermolene/TiddlyWiki5/commit/1c283c55865b3b128101c26f60d594313764c621
It's true that it's a bit counter-intuitive, but I would assume that
it's more common to use "has" or "get" in order to do something with the
field value, and in these cases it's more convenient not to have to
check if the value is empty before using it. That's how I interpreted it
at least ;)
It’s too late to change the semantics of the existing operator, but
I’d certainly be interested in backwards compatible ways of addressing
the problem in the original post.
the first idea that comes to mind is to add a field operator "empty[f]"
(or "empty-field[f]"), which keeps the tiddlers as input only if they
have a field "f" with an empty value (removes both the ones which don't
contain a field "f" and the ones in which "f" has a value).
Cheers
Erwan
Best wishes
Jeremy
Best wishes,
— tb
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