ListPublisher section name transformer not working

[joeljfischer]

Hi, I have a .sectionBy clause set up, but it appears that the name transformer isn't working.

listPublisher = CoreStoreDefaults.dataStack.publishList(
    From<Stopwatch>()
        .sectionBy(\.$isStarted, { (sectionName) -> String? in
            if sectionName == "1" {
                return "Running".localized()
            } else {
                return "Stopped".localized()
            }
        })
        .orderBy(.descending(\.$name))
)

Here, $.isStarted a boolean virtual property, but that all appears to be working correctly. I can breakpoint within the .sectionBy closure and it's running and returning the correct string, but 0 or 1 is still appearing as the section header of my list. Do I need to implement titleForHeader / viewForHeaderInSection? It says to do so under the ListMonitor documentation but not the list publisher documentation. If so, what would I access to see my transformed string?

[JohnEstropia]

@joeljfischer The titleForHeader / viewForHeaderInSection for DiffableDataSource adapters currently doesn't support the custom sectionIndex transformers, sorry about that. I'll try to rework the adapters in an update, but for now you have the following options to work around it:

• Subclassing DiffableDataSource.TableViewAdapter or DiffableDataSource.CollectionViewAdapter and override the tableView(_:titleForHeaderInSection:) or collectionView(_:viewForSupplementaryElementOfKind:at:)

• Adding a Field.Virtual property that implements the logic. You can then use that property as the sectionBy key. See the Demo app's example:

  Modern.ColorsDemo.dataStack.publishList(
          From<Modern.ColorsDemo.Palette>()
              .sectionBy(\.$colorGroup)
              / /...
      )

      @Field.Virtual(
          "colorGroup",
          customGetter: { object, field in
  
              if let colorGroup = field.primitiveValue {
  
                  return colorGroup
              }
              let colorGroup: String
              switch object.$hue.value * 359 {
  
              case 0 ..< 20: colorGroup = "Lower Reds"
              case 20 ..< 57: colorGroup = "Oranges and Browns"
              case 57 ..< 90: colorGroup = "Yellow-Greens"
              case 90 ..< 159: colorGroup = "Greens"
              case 159 ..< 197: colorGroup = "Blue-Greens"
              case 197 ..< 241: colorGroup = "Blues"
              case 241 ..< 297: colorGroup = "Violets"
              case 297 ..< 331: colorGroup = "Magentas"
              default: colorGroup = "Upper Reds"
              }
              field.primitiveValue = colorGroup
              return colorGroup
          }
      )
      var colorGroup: String