Issues with inverse queries
On Fandata, the nature of a person's role depends on the existence of incoming properties. For instance, to get all persons credited with authorship, the query argument would look like this:
[[Class::Persons]] [[-Has author::+]]
And similarly for cover designers:
[[Class::Persons]] [[-Cover design by::+]]
This brings up two issues:
-
How can I add a filter so that users can look in specific categories (schrijver, illustrator, etc.)?
-
The query above returns no results in WSSearch, but works fine in a regular
#ask
query. See https://fandata.wikibase.nl/Persoon/Schrijvers