I removed the Queryset Ordering since the problem introducing the topic no longer shows up.
Suggesting a good article about migration strategies and customizing migration scripts would be great in a footnote, but I haven't found any. I was thinking whether I should write one myself, but I decided not to: probably it's beyond the scope of this chapter (it's called Advanced Forms after all) and deciding what strategy to use would require further discussions anyway.
Finally, I had to re-add the custom <input> to the html template. Conditionally adding classes seemed to be the easiest done this way, and we need that to display the error.
I removed the Queryset Ordering since the problem introducing the topic no longer shows up. Suggesting a good article about migration strategies and customizing migration scripts would be great in a footnote, but I haven't found any. I was thinking whether I should write one myself, but I decided not to: probably it's beyond the scope of this chapter (it's called Advanced Forms after all) and deciding what strategy to use would require further discussions anyway. Finally, I had to re-add the custom
<input>to the html template. Conditionally adding classes seemed to be the easiest done this way, and we need that to display the error.