I need help to understand 2-entity relationship

Question

Created Jul ’15

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Participants 1

I can`t fined swift manual with more then 1 entity.

For example, i have 2 friends: Jon and David. I created this model core data:

1 entity: Frends

2 entity: Memo

I want save memo for Jon:

let entityDescription = NSEntityDescription.entityForName("Memo", inManagedObjectContext: managedObjectContext!)

let act = Memo(entity: entityDescription!, insertIntoManagedObjectContext: managedObjectContext)

act.text = "Gave me 2 books"

act.frend.name = "Jon"

var error: NSError?

managedObjectContext?.save(&error)

if let err = error {

println(err.localizedFailureReason)

} else {

println("Saved")

}

But I got message "nil"

???

Boost

Answer 1

Jul ’15

At last I fined solution:

let entityDescription = NSEntityDescription.entityForName("Frends", inManagedObjectContext: managedObjectContext!)

let act = Frends(entity: entityDescription!, insertIntoManagedObjectContext: managedObjectContext)

let entityDescriptionChild = NSEntityDescription.entityForName("Memo", inManagedObjectContext: managedObjectContext!)

let mem = Memo(entity: entityDescriptionChild!, insertIntoManagedObjectContext: managedObjectContext)

act.name = "Jonnie"

mem.text = "Gave me 2 books"

mem.frend = act

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