In certain cases it makes sense to do something like this:

case msg of
    Rated newRating ->
        let
            movie = model.currentMovie
        in
            { model | currentMovie = Movie model.title model.director newRating}

I’ve found this pattern useful in cases like updating the entire record, e.g.:

type alias User = { name : String, isLoggedIn : Bool }case msg of
  UpdateCurrentUser newUser ->
    { model | user = User newUser.name True }

Still not ideal, but I found it to help me reduce some code in the app I’m currently working on :-)