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Editorial Team
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Asked: 2026-05-22T03:08:50+00:00

I have an entity called Attachment where it has a to-many relationship with no

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I have an entity called Attachment where it has a to-many relationship with no inverse relationship.

I am attempting to locate all Attachment entities whose downloaded attribute is NO the relationship name is attachments and I wrote the following predicate to do this.

[NSPredicate predicateWithFormat:@"ALL attachments.downloaded == NO"]

Which results in *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Unsupported predicate (null)'

This only happens on a SQLite store, if I change the store to Binary it seems to work fine. I would prefer to stick with a SQLite store.

Any ideas? Anyways to write the predicate differently to achieve the same desired result?

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1 Answer

  1. Editorial Team

    I seem to have found a work around for now…

    attachmentRequestResults = [self.managedObjectContext executeFetchRequest:attachmentIdRequest error:&error];
attachmentPredicate = [NSPredicate predicateWithFormat:@"ALL attachments.downloaded == NO"];
attachmentRequestResults = [attachmentRequestResults filteredArrayUsingPredicate:attachmentPredicate];

    I removed the predicate for the fetchrequest so that it returns all entities and then I run my predicate on the returned array

    Still looking for a solution where I can execute the predicate against Core Data though

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