I’m trying to restrict following model to “one per day”. It can reference 2 types of other structs (templet or preset) hence 2 different id’s. And it sets it’s creation day date to same one.

I was expecting #Unique constraint to work in a way where it “upserts” models with say same templateId and date, but it still creates new ones.

Am I doing something wrong, or misunderstanding how this is supposed to work?

import SwiftUI
import SwiftData


@Model
final class MySession {
  #Index< MySession >(
    [.presetId], [.templateId],
    [.presetId, .createdAtDay],
    [.templateId, .createdAtDay]
  )
  #Unique< MySession >([.presetId, .createdAtDay], [.templateId, .createdAtDay])
  
  var presetId: UUID?
  var templateId: UUID?
  var createdAtDay: Date
  
  init(
    presetId: UUID?,
    templateId: UUID?
  ) {
    self.presetId = presetId
    self.templateId = templateId
    self.createdAtDay = Calendar.current.startOfDay(for: .now)
  }
}