Filter Core Data results by property IN array
Try this:
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"tid IN %@", filterArray];
[request setPredicate:predicate];
Have a look at the Aggregate Operations in the Predicate Programming Guide.
EDIT
Have a look at NSPredicate iPhone 3.2 SDK Core Data “IN clause” NSInvalidArgumentException exception. It's same error you have. The problem was a typo in the column/attribute name. The syntax should be alright, it can't just find tid
.
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markdorison
Updated on May 26, 2020Comments
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markdorison almost 4 years
I currently have Core Data successfully returning all of the results for a specific entity titled
Event
:NSManagedObjectContext *context = [delegate managedObjectContext]; NSEntityDescription *entityDescription = [NSEntityDescription entityForName:@"Event" inManagedObjectContext:context]; NSFetchRequest *request = [[NSFetchRequest alloc] init]; [request setEntity:entityDescription]; NSError *error; NSArray *fetchResults = [context executeFetchRequest:request error:&error];
One property of the Event entity is a string titled
tid
. I also have an arrayfilterArray
that contains all allowed tid values.How can I get my Core Data request to only return events that have a tid property that matches one of the values in
filterArray
? I believe the answer relates to NSPredicate but I am not familiar enough with it yet to get it to bend to my will. -
markdorison almost 13 yearsThanks for your response. I attempted your suggestion but I am getting an 'NSInvalidArgumentException', reason: 'unimplemented SQL generation for predicate : (tid IN {1, 2})'. Any idea on this one?
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Guy Kahlon over 6 yearsCan I use NSPredicate *predicate = [NSPredicate predicateWithFormat:@"tid IN[c] %@", filterArray]; for case insensitive?
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Mateus Forgiarini da Silva almost 5 years@GuyKahlon have you figured out how to make an IN query case insensitive?
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Nick Weaver almost 5 yearsI guess doing a map on the array and lowercase every entry might be a solution.