Deleting CoreData without onDelete in SwiftUI - core-data

Question

my app shows CoreData as following in VStack. List isn't possible due to ScrollView.
VStack (spacing: 20) {
ForEach(groups) { group in
NavigationLink(destination: GroupView()) {
ZStack (alignment: .bottomLeading) {
Image(uiImage: (UIImage(data: group.groupThumbnail ?? self.image) ?? UIImage(named: "defaultGroupThumbnail"))!)
.resizable(capInsets: EdgeInsets())
.aspectRatio(contentMode: .fill)
.frame(height: 200, alignment: .center)
.cornerRadius(22)
VStack (alignment: .leading) {
Text("\(group.groupTitle ?? "Untitled")")
.font(.title)
.fontWeight(.heavy)
.multilineTextAlignment(.leading)
Text("Consists of 5 Flowers")
}
.padding([.leading, .bottom], 18.0)
.foregroundColor(.primary)
}
However, I can delete my entries with onDelete. Therefore, I am trying to find an alternative with .contextMenu.
.contextMenu {
Button (role: .destructive) {
withAnimation {
self.deleteGroups(at: IndexSet.init(arrayLiteral: 0)) // This is the code I copied from the video.
}
} label: {
Label("Delete", systemImage: "trash")
}
Button {
print()
} label: {
Label("Edit", systemImage: "square.and.pencil")
}
}
I saw a video in which somebody was able to delete his entry with the combination of these to codes
When tapping on "Delete", the entry should be deleted by this code:
func deleteGroups(at offsets: IndexSet) {
for offset in offsets {
let group = groups[offset]
viewContext.delete(group)
}
//try? viewContext.save()
}
But, whenever I click this "Delete" Button in context menu, the wrong one gets deleted. I can't get the code to delete the selected entry. If anyone can help me, that would be appreciated. Thanks in Advance!
Not that important but, is there a delete feature compared to "onDelete" (such as swiping to delete) I can still implement? And are there any possibilities for animation in my case?
Kind Regards

Answer 1

Just delete it in the normal way:
Button (role: .destructive) {
withAnimation {
viewContext.delete(group)
do {
try viewContext.save()
} catch {
// show error
}
}
} label: {
Label("Delete", systemImage: "trash")
}
FYI I also edited your question to fix your ForEach syntax.

Answer 2

ForEach(groups, id: \.self) { group in
.contextMenu {
Button (role: .destructive) {
for index in groups.indices{
if group == groups[index]{
withAnimation{
viewContext.delete(group)
}
}
}
} label: {
Label("Delete", systemImage: "trash")
}
Button {
print()
} label: {
Label("Edit", systemImage: "square.and.pencil")
}
}