SwiftUI Nested ForEach should only be used for *constant* data - swiftui

Question

I have created a view with a nested ForEach loop and I am getting the following error in the logs:
> count (2) != its initial count (1). `ForEach(_:content:)` should only
> be used for *constant* data. Instead conform data to `Identifiable` or
> use `ForEach(_:id:content:)` and provide an explicit `id`!
I have made the structs conform to identifiable which doesn't seem to reslove the error.
How can I resolve the error?
import SwiftUI
struct LessonStruct: Identifiable {
var id: Int
var name: String
var questions: [QuestionStruct]
}
struct QuestionStruct: Identifiable {
var id: Int
var type: QuestionType
var description: String
var questionId: Int
}
class LessonsObject: ObservableObject {
#Published var Array = [LessonStruct]()
#Published var selectedLesson: Int?
}
struct CreateLessonList: View {
#EnvironmentObject var lesson: LessonsObject
#Binding var showingActionSheet: Bool
var rowNumber:Int = 0
var body: some View {
VStack{
ForEach(self.lesson.Array) { each in
VStack(spacing: 0){
HStack(){
TextField("Lesson \(each.id) - click to change name", text: self.$lesson.Array[each.id-1].name).font(.custom("Proxima Nova Alt Bold", size: 20)).foregroundColor(Color.white).padding(.leading, 10)
Spacer()
Image("PlusIcon").resizable().frame(width: 20, height: 20).padding(.trailing, 10).onTapGesture {
self.lesson.selectedLesson = each.id - 1
self.showingActionSheet = true
}
}.frame( height: 40).background(Color.init("Orange"))
if(self.lesson.Array[each.id - 1].questions.count == 0){
VStack{
Text("Click the '+' icon to add a question.").font(.custom("Proxima Nova Alt Thin", size: 15))
}.frame(height: 70)
}else{
ForEach(self.lesson.Array[each.id - 1].questions.indices){ i in
if(self.lesson.Array[each.id - 1].questions[i].type == .Translation){
Group{
HStack{
Image("TranslationIcon").resizable().frame(width: 50, height:65)
Text(self.lesson.Array[each.id - 1].questions[i].description)
Spacer()
}.padding(20)
}
}
}
}
}
}.background(Color.init("White"))
}
}
}

Answer 1

Use internal ForEach as follows
ForEach(self.lesson.Array[each.id - 1].questions){ question in
if(question.type == .Translation){
Group{
HStack{
Image("TranslationIcon").resizable().frame(width: 50, height:65)
Text(question.description)
Spacer()
}.padding(20)
}
}
}
and review your LessonStruct.id construction logic, cause it looks error prone to refer to [.id - 1].