QueryKit, a simple CoreData query language for Swift.
Person.queryset(context).filter(Person.name == "Kyle").delete()
To retrieve objects from CoreData with QueryKit, you can construct a QuerySet for your model in a managed object context.
A queryset is an immutable object, any operation will return a new queryset instead of modifying the queryset.
var queryset = Person.queryset(context)
You can filter a queryset using the filter and exclude methods, which
accept a predicate and return a new queryset.
queryset.filter(NSPredicate(format:"name == %@", "Kyle")) queryset.filter(Person.name == "Kyle") queryset.exclude(Person.age < 21)
You can order a queryset's results by using the orderBy method which accepts
a collection of sort descriptors:
queryset.orderBy(NSSortDescriptor(key: "name", ascending: true)) queryset.orderBy(Person.name.ascending) queryset.orderBy([Person.name.ascending, Person.age.descending])
You can use slicing to limit a queryset to a range. For example, to get the first 5 items:
queryset[0..5]
var kyle = queryset.filter(Person.name == "Kyle").get()
var orta = queryset[3]
println("There are \(queryset.count() - 1) more Kyle's.")
for person in queryset { println(person.name) }
queryset.array()
This method immediately deletes the objects in your queryset and returns a count and an error if the operation failed.
queryset.delete()
We've extended NSPredicate to add support for the !, && and || operators
for joining predicates together.
NSPredicate(format:"name == Kyle") || NSPredicate(format:"name == Katie") NSPredicate(format:"age >= 21") && !NSPredicate(format:"name == Kyle")
Person.name == "Kyle" || Person.name == "Katie" Person.age >= 21 || Person.name != "Kyle"
QueryKit is released under the BSD license. See LICENSE.