CODEWITHSUNDEEP
core-dataswift2
Shawjak3
Shawjak3

Reputation: 541

How do I loop through an NSSet of Core Data

I have a User entity and a Hobby entity and a relationhip of to-many where one User can have many Hobbies. I am adding the user to a hobby like this, `@IBAction func addHobby(sender: AnyObject) {

    let appDel:AppDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
    let context:NSManagedObjectContext = appDel.managedObjectContext

    var newHobby = NSEntityDescription.insertNewObjectForEntityForName("Hobby", inManagedObjectContext: context) as! Hobby
    newHobby.name = addHobbyTextField.text
    newHobby.user = curUser

    do{

        try context.save()
    } catch{

        print("There was a problem \(error)")
    }

}`

but I am trying to figure out how to loop through the User entity object to see what hobbies a certain user has. I am using this currently but its not working, 

@IBAction func printUser(sender: AnyObject) {

    print(curUser!.hobby! as NSSet)

}

I get this in the console:

Relationship 'hobby' fault on managed object (0x7fef13674e10) <Core_Data_Demo.Users: 0x7fef13674e10> (entity: Users; id: 0xd000000000040000 <x-coredata://5E62A797-4124-4816-8AC0-32C5E723F830/Users/p1> ; data: {
hobby = "<relationship fault: 0x7fef134515c0 'hobby'>";
password = test;
username = free;

})

Any help would be awesome, I'm stuck.

Upvotes: 0

Views: 1533

Answers (1)

Marcus S. Zarra
Marcus S. Zarra

Reputation: 46728

The relationship will be a fault until you access it. That is what you are seeing in your print. You need to walk the relationship to see what is in it:

for item in curUser.hobby {
    print(item)
}

That will cause the relationship to be accessed which will realize the relationship and give you a set of objects to walk.

Note that even with that each hobby will be a fault so you may want to touch a property on the hobby instead of printing the entire object:

for item in curUser.hobby {
    print(item.name)
}

As an example.

I would suggest reading up on faulting in Core Data

Upvotes: 0

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