Help. (coredata, ForEach crash) I've been looking for an answer for 16 hours.

I am using coredata.

Draw a rectangle by taking only 2 values ​​with ForEach. However, when I add new data or modify the data, the app crashes.

ForEach must have a maximum index value of 1. This is because the limit of fetchrequest is 2. However, when I add new data, the value of index becomes 2 and get an 'out of range' error.

I've been looking for an answer for 16 hours.

import SwiftUI

struct chart: View{
  @Environment(\.managedObjectContext) private var viewContext
  @FetchRequest var datas: FetchedResults<Mind>
   
  @State var show = [true, false]
   
  init() {
    let request: NSFetchRequest<Success> = Mind.fetchRequest()
     
    request.sortDescriptors = [
      NSSortDescriptor(keyPath: \Success.date, ascending: false)
    ]
    request.fetchLimit = 2
    _datas = FetchRequest(fetchRequest: request)
  }
   
  var body: some View{
    VStack(alignment: .leading){
      ForEach(0..<datas.map{$0.suc}.count, id: \.self){ index in
        RoundedRectangle(cornerRadius: 5)
          .fill(Color.objcolor.opacity(show[index] ? 1 : 0.7))
          .frame(width: 10, height: 5)
      }
    }
  }
}