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swiftcore-data

Swift: How to filter in Core Data

I'm using the following code to fetch all the data in "category". 

let appDelegate = UIApplication.sharedApplication().delegate as AppDelegate

let managedContext = appDelegate.managedObjectContext!
let fetchRequest = NSFetchRequest(entityName:"category")
let fetchedResults = managedContext.executeFetchRequest(fetchRequest, error: &error) as [NSManagedObject]?

How do I only brings categories where the "type" is equal to "products"?

Solution

  • To "filter" results in Core Data, use NSPredicate like so: 

    let filter = "products"
let predicate = NSPredicate(format: "type = %@", filter)
fetchRequest.predicate = predicate