Add Data to Core Data from Array Swift 3

Question

If I have an array of data for instance:

let  array = ["73", "24", "12", "62", "42"]

And I would like to loop through the array and add its number to my entity called Device with attribute asset_tag and then print out the values from my core data stack.

Currently my code is as follows:

 var data: [String] = ["53","35","26","42","12"]

   let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext

        let task = Device(context: context)

        task.asset_tag = data


        (UIApplication.shared.delegate as! AppDelegate).saveContext()


        do {
            data = try context.fetch(Device.fetchRequest())
        }

        catch {
            print ("This did not work")
        }


        print (data)

but it doesn't look like you can just add an array as the source for data into an attribute.

Do you want to create 5 devices with one attribute respectively or 1 device ? Anyway the array is an array of strings, why do you annotate it as most unspecified [Any]? — vadian
– vadian, Commented Jun 8, 2017 at 4:01
I would like to enter 5 devices, each device would be a different asset tag number. — Martheli
– Martheli, Commented Jun 8, 2017 at 23:22
Then no, you can't do it this way. You need a repeat loop to create the 5 devices. — vadian
– vadian, Commented Jun 9, 2017 at 4:04
Device(context: context) is a custom method. I have no idea what it does exactly. Otherwise (pseudocode) : for tag in data { let device = create_the_device(); device.asset_tag = tag } save_the_context() — vadian
– vadian, Commented Jun 9, 2017 at 20:13

Martheli · Accepted Answer · 2017-06-10 02:23:21Z

1

Spent some time and finally figured it out. Code is as follows:

for device in data {

            let newArray = NSEntityDescription.insertNewObject(forEntityName: "Device", into: context)

            newArray.setValue(device, forKey: "asset_tag")
        }

answered Jun 10, 2017 at 2:23

Martheli

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