将Int16类型的Integer保存到Core Data-Swift

Question

I have a working app that saves a variety of different data points to Core Data. Every single item that saves to a String type field saves just find (I prove it out by fetching it afterwards and printing to screen). However, I'm having trouble with an integer field (Specifically the Int16 data type). Is there something wrong specifically with the line of code below trying to save the "activityOrder"?

    let newActivity = NSEntityDescription.insertNewObjectForEntityForName("Activities", inManagedObjectContext: context) as NSManagedObject

    newActivity.setValue(selectedOwnerName, forKey: "activityOwner")
    newActivity.setValue(selectedActivityType, forKey: "activityType")
    newActivity.setValue(newNumber, forKey: "activityOrder")

    //save the record
    do {
        try newActivity.managedObjectContext?.save()
    } catch {
        print(error)
    }

I can confirm that the variable "newNumber" has a value, and is 1 in fact. the "activityOwner" and "activityType" fields save properly (again, they are all String type fields).

Here is the code I'm using to check if there is anything in there:

    let orderFetchRequest: NSFetchRequest = NSFetchRequest(entityName: "Activities")
    orderFetchRequest.returnsObjectsAsFaults = false
    orderFetchRequest.fetchLimit = 1

    do {
        let orderResults = try appDelegate.managedObjectContext.executeFetchRequest(orderFetchRequest)
        orderData = orderResults as! [NSManagedObject]
    } catch let error as NSError {
        print("Could not fetch \(error), \(error.userInfo)")
    }

    let orderSortDescriptor = NSSortDescriptor(key: "activityOrder", ascending: true)
    orderFetchRequest.sortDescriptors = [orderSortDescriptor]

    print(orderData)

Effectively I print our "orderData" which prints the entire record (which is where I see values for all String data but nil for the order)

I'm fairly new to Core Data and Swift. Do Integers behave differently from Strings when saving to Core Data?

Answer 1

Core data could save only Object type. So if you want to dave Int type then convert it first into NSNumber object then save into Core Data.

let newActivity = NSEntityDescription.insertNewObjectForEntityForName("Activities", inManagedObjectContext: context) as NSManagedObject
newActivity.setValue(selectedOwnerName, forKey: "activityOwner")
newActivity.setValue(selectedActivityType, forKey: "activityType")
newActivity.setValue(NSNumber(short: newNumber), forKey: "activityOrder")