Hi,
I have implemented a facet search, where users essentially select what should
not be included. I do this by constructing an fq filter where I match for the
deselected items that I then negate:
$fq = "{!tag=dt}!($fq)";
$criteria->addParam('fq', $fq);
Now in some cases the field the user is deselecting is actually an empty string.
For example go to the below address and open the "legal value" section. there
is an option "none" there, which is actually an empty string.
http://search.un-informed.org/search?q=malaria&=&tm=any&s=Search
The field itself is just an untokenized string. Of course I could just turn an
empty string into "none" at index time, but I am wondering how to do it in
general :)
I tried using just "" or ["" TO ""] to match for empty strings, but this
matches everything and due to the negation removes everything.
regards,
Lukas Kahwe Smith
[email protected]
