CODEWITHSUNDEEP
iphoneiosobjective-cipad
adit
adit

Reputation: 33674

using NSPredicate in NSFetchedResultsController in core data

I have an app that uses core data and I am trying to generate filtered fetched results using NSPredicate. The model of my core data looks as following:

enter image description here

Essentially an author can have one or more quote. A tag can have many quote and vice versa and a Quote can belong to one or more pack (and hence a Pack can have one or more Quote).

So now I have been able to get all the quotes from an Author using the following:

self.fetchedResultsController = [Author MR_fetchAllGroupedBy:nil
                                                           withPredicate:[NSPredicate predicateWithFormat:@"quotes.@count != 0"]
                                                                sortedBy:AuthorKeys.name
                                                               ascending:YES
                                                                delegate:self];

What if now I wanted to say give me all a list of Authors which has quotes in pack x,y, and z. How would I modify the NSPredicate above?

Upvotes: 1

Views: 195

Answers (1)

fphilipe
fphilipe

Reputation: 10054

I think the following should work.

NSArray *allowedPackNames = @[ @"x", @"y" ];
[NSPredicate predicateWithFormat:@"quotes.packs.packName IN %@", allowedPackNames];

Refer to the Format String Summary

Upvotes: 1

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