SOLVED: An extra row is created on each update of coredata

@AmitShrivastava

Dec '22

I have a simple form with one filed of a specific type that i am getting , every thing is perfect so far I am also able to update the record when i press enter/return. However when i go back and see the list i find an extra row has been created along with correct update what can be the reason of this , can any one suggest , like an extra managedObjectContext , wrong initialisation or any thing else

the code is as below

import SwiftUI
import CoreData

struct EditViewData: View {

    @Environment(\.managedObjectContext) var moc
    @Binding var carData: CarDetails
    @ObservedObject var dataEdit: DataController

    var body: some View {
        VStack {
            TextField("Brand", text: .init(
                get: { self.carData.brandNameTemp  },
                set: { self.carData.brandName = $0 }
            )) {
                let carChange = CarDetails(context: moc)        <----- context
                if carChange.carid == carData.carid {
                    carChange.brandName = carData.brandName
                }   <-----edit
                dataEdit.save()   <-----save
            }

        }
        .navigationBarBackButtonHidden(true)

    }
}

@delawaremathguy

Dec '22

hi Amit,

if the point of your EditViewData is to simply edit one field of an existing Core Data object (of type CarDetails), there is no reason to be executing this statement:

let carChange = CarDetails(context: moc)

this creates a new Core Data object in the managedObjectContext, and so it is no surprise that you find a new item has been added when you return to a list of such objects. (or are you trying to make this view perform both functions of "edit an existing carData" and "add a new carData?)

there may be more to discuss about your code, so let's see where you go next.

hope this helps,

DMG

@AmitShrivastava

Dec '22

I made one more change , thanks DMG , its all fine now

@Binding var carData: CarDetails

@ObservedObject var carData: CarDetails

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