I am building an iTunes-like browser for my CoreData bibliographic database. This is the entities scheme

http://www.cnomania.it/garage/entities-relationships.jpg

My browser follows this order : topics-author-entities-passages

http://www.cnomania.it/garage/browser.jpg

After a few unsuccessful attempts, I am trying to manage this browser through the filterPredicate binding. Now I have the first big issue. I cannot really form a predicate that chooses the author that is linked to a topic. I tried something like

NSPredicate *result= [NSPredicate predicateWithFormat:@”entries.passages.topics.name = ‘%@’”, selectedTopicName];

Yet I got no result whatsoever. The predicates gives me an empty set. Any suggestion? Cheers, DavideBenini

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Try “entries.passages.topics.name == ‘%@’” … Note the double equals.