Hello
Thank you very much for this reply.
I tested it with false on random fields and it works. It's GREAT.
Indeed, querying empty Author fields doesn't make sense.
I should have indicated the field I wanted to query right away. It's the comment field. I tried "comment" or "comments" but it didn't work. I can't find the exact comment name to find books without comments.
Any ideas?
See you soon.
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