nspredicate

I had issues with this and I haven't found a proper answer on SO so I'll leave a small tutorial here. The goal is to filter fetched objects by today's date. Note: It's Swift 3 compatible. Lawrence413 You can't simply use to compare your date to today's date: let today = Date() let datePredicate = NSPredicate(format: "%K == %@", #keyPath(ModelType.date), today) It will show you nothing since it's unlikely that your date is the EXACT comparison date (it includes seconds & milliseconds too) The solution is this: // Get the current calendar with local time zone var calendar = Calendar.current

My situation is simple: I have some records in my core data store. One of their attributes is a string called "localId". There's a point where I'd like to find the record with a particular localId value. The obvious way to do this is with an NSFetchRequest and an NSPredicate. However, when I set this up, the request returns zero records. If, however, I use the fetch request without the predicate, returning all records, and just loop over them looking for the target localId value, I do find the record I'm looking for. In other words, the record is there, but the fetch request can't find it. My

To simplify: There are 3 columns in a table named cards. id packTitle term id is a column - integers from 0.....100 packTitle - string describing packs, lets say there are 3 kinds of pack PACK1, PACK2, PACK3 term - different unsorted names of 101 items. by SQL statement select packTitle from cards group by packTitle; I can get list of 3 items. Could you suggest NSPredicate equivalent of SQL statement GROUP BY. I need to get an array to populate in UITableView. Barry Wark CoreData is an object graph management framework, not a SQL data store. Thus, you should—as quickly as possible—get yourself

I have an array of type "Restaurant" which has an NSSet of "Rating." Rating has an ID and a value. I want to sort the array of Restaurant's by rating with an ID of 01, from high to low. Something like the following, but how do I use the predicate and sort descriptor together on originalArray? NSPredicate *predicate = [NSPredicate predicateWithFormat:@"Rating.rating_id=%d", ratingID]; NSSortDescriptor *descriptor = [NSSortDescriptor sortDescriptorWithKey:@"currentValue" ascending:YES]; NSArray *sorted = [[originalArray allObjects] sortedArrayUsingDescriptors:[NSArray arrayWithObject:descriptor]

I have a request like this : NSPredicate *predicate = [NSPredicate predicateWithFormat:@"ANY attributes.attribute.attributeId IN %@", attributeIds]; That will return a list of objects, that have one ore more of the attributes I set. I want to get a list of objects that have all the attributes I pass, so I tried : NSPredicate *predicate = [NSPredicate predicateWithFormat:@"ALL attributes.attribute.attributeId IN %@", attributeIds]; But I got an exception : 'NSInvalidArgumentException', reason: 'Unsupported predicate (null)' Anyway, I'm not even sure that this is the right request. Say that I

This is quite funny. In my application I create thousands of entry in the database (in another thread, I'm using MagicalRecord). Everything seems working fine (from a background/foreground/context point of view). When, in the main thread, I try to fetch the "just inserted" data, I discovered the following behaviour: - (NSArray *) familiesInCompany:(Company *) company { NSPredicate *predicate1 = [NSPredicate predicateWithFormat:@"company == %@", company]; NSPredicate *predicate2 = [NSPredicate predicateWithFormat:@"company.name == %@", company.name]; NSArray *first = [Family MR_findAllSortedBy:

Is it possible to evaluate a NSPredicate on a NSArray, without having the NSPredicate starting to filter out objects in the array? For instance, say I have the following predicate that just checks the number of objects in an array: NSPredicate *pred = [NSPredicate predicateWithFormat:@"count == 3"]; NSArray *list = [NSArray arrayWithObjects:@"uno", @"dos", @"volver", nil]; BOOL match = [pred evaluateWithObject:list]; This will crash, as pred will try to retrieve the "count" key from the first object in the array instead of the array itself. EmptyStack Use the SIZE operator of NSPredicate which