Delete all data from an attribute in CoreData

Question

How to delete all data for example from an attribute <name>, not Entity, from attribute. I have an entity name - Users, attribute - name and I don't know how to delete all data from an attribute.

Answer 1

for delete the all data you can use this function

func deleteAllData(entity: String) {

    let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
    let managedContext = appDelegate.managedObjectContext
    let fetchRequest = NSFetchRequest(entityName: entity)
    fetchRequest.returnsObjectsAsFaults = false

    do
    {
        let results = try managedContext.executeFetchRequest(fetchRequest)
        for managedObject in results
        {
            let managedObjectData:NSManagedObject = managedObject as! NSManagedObject
            managedContext.deleteObject(managedObjectData)
            print("Deleted")
        }

    } catch let error as NSError {
        print(error)
    }
}

and after that call the function like this

deleteAllData(entity: "your Entity name")