delete past save entries of core data in swift - swift

Question

I have a problem where i cannot completely delete data stored in core data entities. i am storing the username and password in a login system.
i am aware of using the .deleteObject() method but to be honest im not sure if this is actually working as i do a print statement to check in console what is stored and it appears to have not been deleted
here is my code:
let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
let context: NSManagedObjectContext = appDelegate.managedObjectContext
//add user to core data
let user = NSEntityDescription.insertNewObjectForEntityForName("User", inManagedObjectContext: context)
do{
try context.save()
}catch{
print("there was an error saving to core data")
}
do{
let request = NSFetchRequest(entityName: "User")
let results = try context.executeFetchRequest(request)
if results.count > 0{
for item in results as! [NSManagedObject]{
let username = item.valueForKey("username")
let password = item.valueForKey("password")
context.deleteObject(item)
print("aawawaw \(username), \(password)")
}
}
}catch{
print("there was an error")
}

Answer 1

You are printing the values that are stored in the let constants .
Try to implement in for loop
context.deleteObject(item)
let username = item.valueForKey("username")
let password = item.valueForKey("password")
print("aawawaw \(username), \(password)")

Answer 2

You did not really delete the objects from CD.
You should:
delete the object.
store the context
then perform a new fetch on the entity
print all instances of the entity
What you actually do is different:
store the context (with which changes whatever, but noting related to your question)
fetch the entity
delete object from the CD context
print the object that is still around although detached from CD.
as far as t. You are doing:
we can see, you don't save anything and threfore don't save the deleted state.