nspredicate

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 array filterArray that contains all allowed tid

Can I reuse NSPredicate for new variable substitute? My NSPredicate is rather simple: NSPredicate *userPredicate = [NSPredicate predicateWithFormat:@"id == %@",userID]; The userID is generated at run-time with different value, right now for each userID I need to create a NSPredicate. So is it possible I can reuse my NSPredicate ? Yep, you can do this with a variable: NSPredicate *userPredicate = [NSPredicate predicateWithFormat:@"id == $user"]; Save that predicate somewhere, then do this when you need to actually start filtering stuff: NSDictionary *sub = [NSDictionary dictionaryWithObject

I have sort of an unfriendly array of dictionaries that in turn have arrays of data and I am trying to filter the outer array based on any of the inner array passing a predicate. I can't seem to create an NSPredicate to make this work. I started off with: NSPredicate *lookupPredicate = [NSPredicate predicateWithFormat: @"row_values.property_id == %@ AND row_values.property_value == %@", @"47cc67093475061e01000540", @"Male"]; [dataRows filterUsingPredicate:lookupPredicate]; This returns no values. I've tried various forms of ANY but I can't seem to find anything that it will parse. Again, the

Say I have core data objects of type "obj" that has a property "propertyA" and a one-to-many relationship with an object of type "sub" that has two properties, "propertyB" and "propertyC". I want to fetch all the objs that have propertyA equal to a value and a sub obj with propertyB and propertyC set. If it was just propertyA and propertyB, I would do [NSPredicate predicateWithFormat:@"ANY sub.propertyB = %@ AND propertyA == %@", ...]; The problem is that I can't figure out how to add in the second property. I want only the objs that have at least one sub that has the two properties true. I've

I am trying to sort my array while using NSPredicate.. I have read other places that possibly using NSSortDescriptor could be an option. Having some trouble figuring this out. I am attempting to sort my array by companyName. Any advice appreciated, thanks Greg - (void)filterSummaries:(NSMutableArray *)all byNameThenBooth:(NSString*) text results:(NSMutableArray *)results { [results removeAllObjects]; if ((nil != text) && (0 < [text length])) { if ((all != nil) && (0 < [all count])) { NSPredicate *predicate = [NSPredicate predicateWithFormat: @"companyName contains[cd] %@ OR boothNumber

I have an int32 attribute in a Core Data database. I use this int as an enum bit field. Is it possible to create a NSPredicate to query items based on the binary value of this int ? Something like @"bitFieldAttribute & 0x0001" ? I'm also wondering if this is possible with a binary typed attribute ? NSPredicate can handle it, but I'm not sure if CoreData will accept it as a valid predicate for execution on a data store. It might have trouble converting the bitwise operator into a SQL query (if you're using a SQLite backing store). You'll just have to try it. The syntax, however, is just what