NSPredicate to fetch records in alphabetical order in CoreData
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I am trying to fetch records from an Entity, the records are huge above 5000. So i want to fetch the records with alphabetically sorted(name paramter) instead of sorting with NSSortDescriptor on result array.
Is there any predicate we can place to fetech records alphabetically sorted.
NSSortDecriptor within your
NSFetchRequest *fetchRequest, like you would with any predicate
[fetchRequest setSortDescriptors:@[[[NSSortSDescriptor alloc] initWithKey:@"name parameter" ascending:YES]]];
This means your request is already sorted like you require as it's being fetched.
As Kaszas has already said, an NSPredicate isn't for sorting, it's for filtering
Hope this helps
ios, Set the NSSortDecriptor within your NSFetchRequest *fetchRequest , like you would with any predicate [fetchRequest Examples of using NSPredicate to filter NSFetchRequest. Predicates are one of the most powerful features of Core Data, but they are actually useful in lots of other places too so if you master them here you'll learn a whole new skill that can be used elsewhere.
let sortDescriptor = NSSortDescriptor(key: "name", ascending: true) fetchRequest.sortDescriptors = [sortDescriptor]
Core Data for iOS: Developing Data-Driven Applications for the , Set it to sort the items in ascending alphabetical order by their name, and set a predicate to fetch only the instances whose superCollection is nil, as shown in The sort descriptors specify how the objects returned when the NSFetch Request is issued should be ordered—for example, by last name and then by first name. The sort descriptors are applied in the order in which they appear in the sort Descriptors array (serially in lowest-array-index-first order).
No, you can't sort an array with an NSPredicate.
The NSPredicate class is used to define logical conditions used to constrain a search either for a fetch or for in-memory filtering.
Predicates and Sorting - Beginning Core Data, to filter and sort your results by way of the NSPredicate and the NSSortDescriptor Duration: 10:29 Posted: Aug 14, 2017 Sort descriptors are great and easy to use, but predicates are what really makes fetching powerful in Core Data. Sort descriptors tell Core Data how the records need to be sorted. Predicates tell Core Data what records you're interested in. The class we'll be working with is NSPredicate. Let's start by fetching every member of the Doe family.
Pro Core Data for iOS: Data Access and Persistence Engine for , Fetch requests are composed of two main elements: an NSPredicate instance and an and the NSSortDescriptor arranges the result set in a specific order. Request setPredicate:predicate]; To sort the result set alphabetically by the name of Questions: I am trying to use a UISearchBar to query multiple properties of a NSManagedObject I have a NSManagedObject called Person, every person has a name and socialSecurity property.
Pro iOS Persistence: Using Core Data, Using Core Data Michael Privat, Robert Warner. Sorting Until now, we've accepted the output order of any fetch request as Core Data chose to return it, but Core We can add another sort descriptor that sorts the words in descending alphabetical order, ascending:NO]; fetchRequest.predicate = predicate; fetchRequest. 4 NSPredicate to fetch records in alphabetical order in CoreData Sep 3 '14 4 Getting 0.2GB extra available space in iPad Oct 23 '13 3 How to get Transaction id when using Credit Card option in iOS PayPal SDK Dec 14 '13
Learning Core Data for iOS: A Hands-On Guide to Building Core Data , A Hands-On Guide to Building Core Data Applications Tim Roadley and you should see the managed object names are now sorted in alphabetical order. A predicate is defined for a fetch request using an instance of NSPredicate and then Predicates represent logical conditions, which you can use to filter collections of objects. Although it's common to create predicates directly from instances of NSComparison Predicate, NSCompound Predicate, and NSExpression, you often create predicates from a format string which is parsed by the class methods on NSPredicate.