Swift 3 - Core Data - create object - arrays

Question

So I am trying to fetch my data from my core data database, put it into objects and then into an array which I then callback.
func getCoffeeBrandsFromDB(callback: #escaping (_ dbCoffeeBrands: Array<Any>)-> ()) {
//create a fetch request, telling it about the entity
print("running getCBFDB")
var coffeeBrandArray = Array<Any>()
let fetchRequest: NSFetchRequest<NSFetchRequestResult> = NSFetchRequest(entityName: "CoffeeBrand")
do {
let searchResults = try getContext().fetch(fetchRequest)
print ("num of results = \(searchResults.count)")
for brands in searchResults as! [NSManagedObject] {
let brand = CoffeeBrand()
brand.dataBaseId = brands.value(forKey: "dataBaseId") as! Int64
brand.brandName = brands.value(forKey: "brandName") as? String
brand.numberOfCoffeesNeeded = brands.value(forKey: "numberOfCoffeesNeeded") as! Int32
coffeeBrandArray.append(brand)
print("brands virker med \(brand.brandName!)")
}
print("CcffeeBrandArray.count is: \(coffeeBrandArray.count)")
callback(coffeeBrandArray)
} catch {
print("Error with request: \(error)")
}
}
When I run getCoffeeBrandsFromDB I get this errorlog:
running getCBFDB
num of results = 4
2017-02-08 15:47:02.179211 Keebin_development_1[8373:626945] [error] error: CoreData: error: Failed to call designated initializer on NSManagedObject class 'CoffeeBrand'
CoreData: error: CoreData: error: Failed to call designated initializer on NSManagedObject class 'CoffeeBrand'
2017-02-08 15:47:02.180 Keebin_development_1[8373:626945] -[CoffeeBrand setDataBaseId:]: unrecognized selector sent to instance 0x608000279e80
2017-02-08 15:47:02.189 Keebin_development_1[8373:626945] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[CoffeeBrand setDataBaseId:]: unrecognized selector sent to instance 0x608000279e80'
*** First throw call stack:
(
0 CoreFoundation 0x0000000110c36d4b __exceptionPreprocess + 171
1 libobjc.A.dylib 0x000000011027721e objc_exception_throw + 48
2 CoreFoundation 0x0000000110ca6f04 -[NSObject(NSObject) doesNotRecognizeSelector:] + 132
3 CoreFoundation 0x0000000110bbc005 ___forwarding___ + 1013
4 CoreFoundation 0x0000000110bbbb88 _CF_forwarding_prep_0 + 120
5 Keebin_development_1 0x000000010fc20e5c _TF20Keebin_development_121getCoffeeBrandsFromDBFT8callbackFGSaP__T__T_ + 1804
6 Keebin_development_1 0x000000010fc2d314 _TFC20Keebin_development_126LoyaltyCardsViewController11viewDidLoadfT_T_ + 180
7 Keebin_development_1 0x000000010fc2d5e2 _TToFC20Keebin_development_126LoyaltyCardsViewController11viewDidLoadfT_T_ + 34
8 UIKit 0x00000001111fca3d -[UIViewController loadViewIfRequired] + 1258
9 UIKit 0x000000011123d28f -[UINavigationController _layoutViewController:] + 55
10 UIKit 0x000000011123db77 -[UINavigationController _updateScrollViewFromViewController:toViewController:] + 471
11 UIKit 0x000000011123dcee -[UINavigationController _startTransition:fromViewController:toViewController:] + 133
12 UIKit 0x000000011123eef9 -[UINavigationController _startDeferredTransitionIfNeeded:] + 874
13 UIKit 0x000000011123ffdb -[UINavigationController __viewWillLayoutSubviews] + 58
14 UIKit 0x0000000111436dd7 -[UILayoutContainerView layoutSubviews] + 223
15 UIKit 0x000000011111fab8 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 1237
16 QuartzCore 0x00000001161ffbf8 -[CALayer layoutSublayers] + 146
17 QuartzCore 0x00000001161f3440 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 366
18 QuartzCore 0x00000001161f32be _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24
19 QuartzCore 0x0000000116181318 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 280
20 QuartzCore 0x00000001161ae3ff _ZN2CA11Transaction6commitEv + 475
21 UIKit 0x0000000111053d9b _UIApplicationFlushRunLoopCATransactionIfTooLate + 206
22 UIKit 0x000000011185e77c __handleEventQueue + 5672
23 CoreFoundation 0x0000000110bdb761 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
24 CoreFoundation 0x0000000110bc098c __CFRunLoopDoSources0 + 556
25 CoreFoundation 0x0000000110bbfe76 __CFRunLoopRun + 918
26 CoreFoundation 0x0000000110bbf884 CFRunLoopRunSpecific + 420
27 GraphicsServices 0x00000001152f9a6f GSEventRunModal + 161
28 UIKit 0x000000011105ac68 UIApplicationMain + 159
29 Keebin_development_1 0x000000010fc3fe5f main + 111
30 libdyld.dylib 0x000000011434d68d start + 1
31 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
I can't seem to figure out where my problem is. I have created my CoffeeBrand+CoreDataClass.Swift and CoffeeBrand+CoreDataProperties.Swift with the editor-> create NSManaged Object Subclass and as other SO questions/answered has said with the codegen to manual/none.
The two classes mentioned:
import Foundation
import CoreData
#objc(CoffeeBrand)
public class CoffeeBrand: NSManagedObject {
}
and:
import Foundation
import CoreData
extension CoffeeBrand {
#nonobjc public class func fetchRequest() -> NSFetchRequest<CoffeeBrand> {
return NSFetchRequest<CoffeeBrand>(entityName: "CoffeeBrand");
}
#NSManaged public var brandName: String?
#NSManaged public var dataBaseId: Int64
#NSManaged public var id: Int64
#NSManaged public var numberOfCoffeesNeeded: Int32
}
Can someone see where I'm going wrong? Obviously it's in my for-loop but I don't know where/what/how to do it right.
Thanks in advance!

Answer 1

I figured out where I went wrong.
I changed let fetchRequest: NSFetchRequest<NSFetchRequestResult> = NSFetchRequest(entityName: "CoffeeBrand")
to
let fetchRequest: NSFetchRequest<NSManagedObject> = NSFetchRequest(entityName: "CoffeeBrand")
this way it is objects I fetch from the DB.
Then it was easy. Now my for-loop is simply:
for brands in searchResults {
coffeeBrandArray.append(brands)
}
callback(coffeeBrandArray)
} catch {
print("Error with request: \(error)")
}
}
And now everything works as it should.