Re: ModelAdmin with inlines: How to learn if/what has changed before the models are saved?

Hi Collin,

Am 20.12.2014 um 00:18 schrieb Collin Anderson:
> save_model() happens first, then save_related() which
> calls save_formset() on each formset.
>
> It might end up being easier to save the parent model _again_, instead
> of doing something before it's saved.

Thank you very much for your reply, that helped a lot!

> _has_changed() / has_changed() may come in handy in your case.
> https://docs.djangoproject.com/en/dev/ref/forms/fields/#has-changed

In Django 1.7, it seems that _has_changed() takes several parameters
that I had not readily available, so I eventually looked this up in the
Django 1.7 source code (django/forms/forms.py), and now instead of, for
example (probably valid Django 1.8 code):

if form.fields['birthday'].has_changed(): ...

with Django 1.7 I use:

if "birthday" in form.changed_data: ...

which works very well!

Thanks again for your help!

:-)

Best regards,
Carsten

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