unrecognized selector sent to instance 0x600000d68f00

I've got a simple premise I'm trying to implement, and I've created a test project to do so. Basically I want the app to load in a list, and then update the quantity of a given item in that list. I'm at a point where I get the following error message:

Code Block 
 "-[testies.QuantEntity quant]: unrecognized selector sent to instance 0x600000d68f00'

I've been over it and done as much research as I can, but now I'm stuck. Here is my code:

Where I store the array

Code Block 
import SwiftUI
struct Consoles {
    var id: Int
    var name: String
}
final class ConsoleModel{
    var consoles: [Consoles] = [
        Consoles(id: 0, name: "NES"),
        Consoles(id: 1, name: "SNES"),
        Consoles(id: 2, name: "Genesis"),
        Consoles(id: 3, name: "N64")
    ]
}

Displaying the list (selecting an item here crashes app)

Code Block 
import SwiftUI
struct ConsoleList: View {
    
    var consoles = ConsoleModel().consoles
    var body: some View {
        NavigationView{
            List(0 ..< consoles.count) {value in
                NavigationLink(
                    destination: ConsoleDetails(consoles: QuantEntity()),
                    label: {
                        Text(consoles[value].name)
                    })
            }
        }
    }
}

Details (what's supposed to show when selected)

Code Block 
import SwiftUI
import CoreData
struct ConsoleDetails: View {
    @State private var stepper: Int = 0
    @Environment(\.managedObjectContext) var moc
    var consoles: QuantEntity
    var body: some View {
        Stepper("number of games = \(stepper)", value: $stepper){_ in
            let newQuant = QuantEntity(context: self.moc)
            newQuant.quant = Int32(self.stepper)
            try? self.moc.save()
        }
        .onAppear{
            self.stepper = Int(consoles.quant)
        }
    }
}

Any advice or resources would be appreciated. I could be going about this completely wrong.

My first attempt was to use a local json and rewrite the file when saving a new value, but this came with it's own set of issues. My next attempt would be this: use Core Data to store a value that is attached to an index in an array.