Hi,
I recently needed to override a manytomany field on the save_model()
method in the admin. However, this is not possible because it will get
overwritten later with the original values. I asked if this will
change in the future on the django-developers list:
http://groups.google.com/group/django-developers/msg/180d491dc781be49
Never got an answer...
Anyway, here is how I solved it. If you look at django/contrib/admin/
options.py, you will see that the order of saving is this:
1. save_model()
2. save_m2m()
3. save_formset()
So, overriding the save_formset() method (I'm using inlines anyway,
but I think it would work without them as well) enables me change the
way manytomany behaves. Example use in my MyAdmin.py:
def save_formset(self, request, form, formset, change):
"override the manytomany field"
super(MyAdmin, self).save_formset(request, form, formset,
change)
if formset.field == something: # see note later on
# form.instance is your model
...do something with form.instace
....
form.instance.save()
Note: this function will run as many times as the inline forms you
have, so make sure it only happens once, maybe using an if statement
to check something on your formset, as done above.
hope it helps someone,
hadaraz
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