how to tell if a screen is add or change in django admin

Question

I am trying to determine if the admin screen in Django is add or change in the save method. If I internet search on this, I cannot find any answer. What is the proper way to do this in Python?

Answer 1

As with ModelForms, you can use a similar trick:

def save_model(self, request, obj, form, change):
    if obj._state.adding:
        # Adding
    else:
        # Editing

    super().save_model(request, obj, form, change)

Answer 2

We can check self.instance but just before super().init() is called. Try out my solution https://stackoverflow.com/a/70845558/15080117