Core Data, Problem with updating (duplicating instead) - core-data

Question

I am new to Swift UI. Could you please help me with core data updating?
Here is the point of a problem:
I am building a WatchOS app. There are 3 Views there:
FirstView - a view with a button to Add a new Goal and a List of added Goals.
AddGoalView - appears after pressing Add new Goal.
RingView - a view with a Goal Ring (similar to activity ring mechanics) and all the data presented.
The point of the problem is the next:
After adding a new Goal everything is alright. The Data passes correctly from AddGoalView to the FirstView. I need only 2 items to be passed out of AddGoalView (One String and one Double).
Then, after pressing on the recently created Goal I appear on the Ring View. I successfully pass there 2 items (that String and Double I mentioned).
On the RingView I want to update the 3-rd Item (double) and send it back. So it can be updated on the FirstView.
the Result:
Instead of updating this 3-d Item it just seems to create a completely new Goal on the First View below the previous Goal. Photo
My Code (FirstView):
struct FirstView: View {
#FetchRequest (
entity:NewGoal.entity(),
sortDescriptors:[NSSortDescriptor(keyPath: \NewGoal.dateAdded, ascending: false)],
animation: .easeInOut )
var results:FetchedResults<NewGoal>
#State var showMe = false
var body: some View {
ScrollView{
VStack{
VStack(alignment: .leading){
Text("My Goals:")
NavigationLink(
destination: AddGoalView(),
isActive: $showMe,
label: {
Image(systemName: "plus")
Text("Set Money Goal")
})
Text("Recents:")
ForEach(results){ item in
VStack(alignment: .leading){
NavigationLink(
destination: RingView(GTitle: item.goalTitle ?? "", Sum: item.neededSum),
label: {
HStack{
Image(systemName: "gear")
VStack(alignment: .leading){
Text(item.goalTitle ?? "")
HStack{
Text("$\(item.yourSum, specifier: "%.f")") ///This item doesn't update
Text("/ $\(item.neededSum, specifier: "%.f")")
}
}
}
})
}
}
}
}
}
}
}
My Code (AddGoalView):
struct AddGoalView: View {
#State private var goalTitle = ""
#State private var showMe:Bool = true
#State private var neededSum:Double = 0.0
#State private var isFocusedNum = false
#Environment(\.managedObjectContext) var context
#Environment(\.presentationMode) var presentationMode
var body: some View {
ScrollView{
VStack (alignment: .leading, spacing: 6){
TextField("Goal Name...", text: $goalTitle)
HStack{
Text("$\(neededSum, specifier: "%.f")")
.overlay(
RoundedRectangle(cornerRadius: 9)
.stroke(isFocusedNum ? Color.red : Color.white, lineWidth: 1)
.opacity(1.0))
.focusable(true) { newState in isFocusedNum = newState}
.animation(.easeInOut(duration: 0.1), value: isFocusedNum)
.digitalCrownRotation(
$neededSum,
from: 0,
through: 100000,
by: 25,
sensitivity: .high)
}
Button(action: addGoal) {
Text("Add Goal")
}
.disabled(neededSum == 0.0)
.disabled(goalTitle == "")
.navigationTitle("Edit")
}
}
}
private func addGoal(){
let goal = NewGoal(context: context)
goal.goalTitle = goalTitle
goal.dateAdded = Date()
goal.neededSum = neededSum
do{
try context.save()
presentationMode.wrappedValue.dismiss()
}catch let err{
print(err.localizedDescription)
}
}
My Code (RingView Code):
struct RingView: View {
#State private var isFocusedSum = false
#State private var yournewSum:Double = 0.0
var goalItem: NewGoal?
var Sum:Double
var GTitle:String
#Environment(\.managedObjectContext) var context
#Environment(\.presentationMode) var presentationMode
#FetchRequest var results: FetchedResults<NewGoal>
init(GTitle: String, Sum: Double){
self.GTitle = GTitle
self.Sum = Sum
let predicate = NSPredicate(format:"goalTitle == %#", GTitle)
self._results=FetchRequest(
entity: NewGoal.entity(),
sortDescriptors: [NSSortDescriptor(keyPath: \NewGoal.dateAdded, ascending: false)],
predicate: predicate,
animation: .easeInOut
)
}
var body: some View {
ZStack{
ForEach(results) { item in
RingShape(percent:(yournewSum/item.neededSum*100), startAngle: -90, drawnClockwise: false) /// Ring
.stroke(style: StrokeStyle(lineWidth: 10, lineCap: .round))
.fill(AngularGradient(gradient: Gradient(colors: [.red, .pink, .red]), center: .center))
.frame(width: 155, height: 155)
HStack(alignment: .top){
Spacer()
Button(action: addSum) { ///BUTTON TO Update
Image(systemName: "gear")
}
.clipShape(Circle())
}
VStack(alignment: .trailing, spacing: 0.0){
Spacer()
Text("$\(yournewSum, specifier: "%.f")") /// Here is the data I want to change via Digital Crown and update
.font(.title3)
.overlay(
RoundedRectangle(cornerRadius: 7)
.stroke(Color.white, lineWidth: 2)
.opacity(isFocusedSum ? 1.0:0.0)
)
.focusable(true) { newState in isFocusedSum = newState}
.animation(.easeInOut(duration: 0.3), value: isFocusedSum)
.digitalCrownRotation(
$yournewSum,
from: 0,
through: Double((item.neededSum)),
by: 10,
sensitivity: .high)
Text("/ $\(item.neededSum, specifier: "%.f")") ///Here is the Double data I entered in AddGoalView
.font(.caption)
}
.frame(width: 200, height: 230)
.padding(.top, 7)
VStack(alignment: .center, spacing: 1.0){
Text(item.goalTitle ?? "Your Goal Name") ///Here is the String data I entered in AddGoalView
.foregroundColor(.gray)
}
.padding(.top, 200.0)
}
}
.padding([.top, .leading, .trailing], 5.0)
}
private func addSum(){
let goal = goalItem == nil ? NewGoal(context: context): goalItem
goal?.yourSum = yournewSum //// I am trying to update the Data here, but after running the func it creates a duplicate.
do{
try context.save()
presentationMode.wrappedValue.dismiss()
} catch let err{
print(err.localizedDescription)
}
}

Answer 1

You never give var goalItem: NewGoal? the initial value of the item you want to update.
try replacing this
RingView(GTitle: item.goalTitle ?? "", Sum: item.neededSum)
with
RingView(goalItem: item, GTitle: item.goalTitle ?? "", Sum: item.neededSum)
and of course your have to change your initializer for RingView to
init(goalItem: NewGoal? = nil, GTitle: String, Sum: Double){
and add to the initializer this line
self.goalItem = goalItem