relations using CoreDatato-many key not allowed here - ios

Question

I am getting a crash related to a core data relationship which is to-many
nueva marca -----><Autos.Marca: 0x7fac604d3250> (entity: Marca; id:
0x7fac604d3300
<x-coredata:///Marca/tB1CE1C53-077E-4402-8E3A-E6C6F147B4672> ; data: {
modelos = (
);
nombre = NIKE; })
Nuevo modelo:::::::: <Autos.Modelo: 0x7fac604d6df0> (entity: Modelo;
id: 0x7fac604d6e50
<x-coredata:///Modelo/tB1CE1C53-077E-4402-8E3A-E6C6F147B4673> ; data:
{
marca = "0x7fac604d3300 <x-coredata:///Marca/tB1CE1C53-077E-4402-8E3A-E6C6F147B4672>";
nombre = "AIRFORCE 1"; }) arreglo Relationship 'modelos' on managed object (0x7fac604d3250) <Autos.Marca: 0x7fac604d3250> (entity:
Marca; id: 0x7fac604d3300
<x-coredata:///Marca/tB1CE1C53-077E-4402-8E3A-E6C6F147B4672> ; data: {
modelos = (
"0x7fac604d6e50 <x-coredata:///Modelo/tB1CE1C53-077E-4402-8E3A-E6C6F147B4673>"
);
nombre = NIKE; }) with objects {(
<Autos.Modelo: 0x7fac604d6df0> (entity: Modelo; id: 0x7fac604d6e50> <x-coredata:///Modelo/tB1CE1C53-077E-4402-8E3A-E6C6F147B4673> ; data:
{
marca = "0x7fac604d3300 <x-coredata:///Marca/tB1CE1C53-077E-4402-8E3A-E6C6F147B4672>";
nombre = "AIRFORCE 1"; }) )} Nuevo Marca <Autos.Marca: 0x7fac604d3250> (entity: Marca; id: 0xd000000000080000
<x-coredata://D8BC4DF2-5A4A-4D3D-A10D-91FE28DABA30/Marca/p2> ; data: {
modelos = (
"0xd000000000080002 <x-coredata://D8BC4DF2-5A4A-4D3D-A10D-91FE28DABA30/Modelo/p2>"
);
nombre = NIKE; }) 2016-05-03 11:21:22.778 Autos[745:17150] *** Terminating app due to uncaught exception
'NSInvalidArgumentException', reason: 'to-many key not allowed here'
*** First throw call stack: ( 0 CoreFoundation 0x000000010bbc7d85 __exceptionPreprocess + 165 1 libobjc.A.dylib
0x000000010d96bdeb objc_exception_throw + 48 2 CoreData
0x000000010b81efff -[NSSQLGenerator newSQLStatementForRequest:ignoreInheritance:countOnly:nestingLevel:nestIsWhereScoped:]
+ 1583 3 CoreData 0x000000010b7117e3 -[NSSQLGenerator newSQLStatementForFetchRequest:ignoreInheritance:countOnly:nestingLevel:nestIsWhereScoped:]
+ 35 4 CoreData 0x000000010b8047b8 -[NSSQLAdapter _statementForFetchRequest:ignoreInheritance:countOnly:nestingLevel:]
+ 344 5 CoreData 0x000000010b71167c -[NSSQLAdapter _newSelectStatementWithFetchRequest:ignoreInheritance:]
+ 316 6 CoreData 0x000000010b7112f6 -[NSSQLCore newRowsForFetchPlan:]
+ 118 7 CoreData 0x000000010b710bac -[NSSQLCore objectsForFetchRequest:inContext:]
+ 524 8 CoreData 0x000000010b710549 -[NSSQLCore executeRequest:withContext:error:]
+ 377 9 CoreData 0x000000010b7f5eaf __65-[NSPersistentStoreCoordinator executeRequest:withContext:error:]_block_invoke
+ 3311 10 CoreData 0x000000010b7ff4dd gutsOfBlockToNSPersistentStoreCoordinatorPerform
+ 189 11 libdispatch.dylib 0x000000010e4043eb _dispatch_client_callout
+ 8 12 libdispatch.dylib 0x000000010e3e8ef5 _dispatch_barrier_sync_f_invoke
+ 393 13 CoreData 0x000000010b7f05d5 _perform
+ 197 14 CoreData 0x000000010b7101b4 -[NSPersistentStoreCoordinator
executeRequest:withContext:error:]
+ 500 15 CoreData 0x000000010b70e973 -[NSManagedObjectContext executeFetchRequest:error:]
+ 579 16 CoreData 0x000000010b7c65f5 -[NSManagedObjectContext executeRequest:error:]
+ 421 17 Autos 0x000000010b652db9 _TFC5Autos14ViewController11viewDidLoadfT_T_
+ 3929 18 Autos 0x000000010b6531f2 _TToFC5Autos14ViewController11viewDidLoadfT_T_
+ 34 19 UIKit 0x000000010c58a984 -[UIViewController loadViewIfRequired]
+ 1198 20 UIKit 0x000000010c58acd3 -[UIViewController view]
...
My view controller code is:
let appDelegado:AppDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
let contexto:NSManagedObjectContext = appDelegado.managedObjectContext
let entidadMarca = "Marca"
let entidadModelo = "Modelo"
let modeloNike = "AIRFORCE 1"
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
//Conusltando Base de datos
let newMarca = NSEntityDescription.insertNewObjectForEntityForName(entidadMarca, inManagedObjectContext:contexto)
newMarca.setValue("NIKE", forKey: "nombre")
print("nueva marca ----->\(newMarca) \n")
//objeto modelo
let newModelo = NSEntityDescription.insertNewObjectForEntityForName(entidadModelo, inManagedObjectContext:contexto)
newModelo.setValue("AIRFORCE 1", forKey: "nombre")
let entytiModelo = NSEntityDescription.entityForName(entidadMarca, inManagedObjectContext:contexto)
let objArray = newMarca.mutableSetValueForKey("modelos")
objArray.addObject(newModelo)
print("Nuevo modelo:::::::: \(newModelo)")
print("arreglo \(objArray)")
saveInBD()
print("Nuevo Marca \(newMarca)")
let entityMarca = NSEntityDescription.entityForName(entidadMarca, inManagedObjectContext:contexto)
let oderBy = NSSortDescriptor(key: "nombre", ascending: true)
let consulta = NSFetchRequest(entityName:entidadMarca )
consulta.sortDescriptors = [oderBy]
let predicate = NSPredicate(format: "modelos = %#",modeloNike )
consulta.entity = entityMarca
consulta.predicate = predicate
if let resultado = try?contexto.executeRequest(consulta){
print("Resultado:::::::--->\(resultado)")
}else{
print("No hay Valores")
}
}
func saveInBD() {
do {
try contexto.save() // Il metodo .save() dell'NSManagedObjectContext svolge questo compito.
} catch let error {
print((error as! NSErrorPointer).debugDescription)
}
}
}

Answer 1

It looks like:
You are fetching the entity Marca
Your predicate for this fetch is NSPredicate(format: "modelos = %#",modeloNike)
modelos is a to-many relationship, which will be represented as a set
modeloNike is a String
So you're asking Core Data to compare two things which are not of the same type, comparing a set to a string. There's your problem.