Just for info, to complete this:
I read in the admin interface source code (contrib/admin/options.py) and
found a solution myself. It's not as clear and straightforward as one
would wish, but simple and robust:
We now simply override the `ModelAdmin.save_formset()` function like this:
def save_formset(self, request, form, formset, change):
if formset.model == Period:
# Save normally.
instances = formset.save()
if instances:
# At least *one* period has changed and was saved,
# so check/update *all* periods of that staff member.
instances[0].staff.UpdateAllPeriods()
else:
# The default implementation of save_formset():
formset.save()
(The ugly trick is the `instances[0].staff` to obtain the parent object.)
Function `UpdateAllPeriods()` simply loops over the `period_set` of the
Staff instance and updates the periods as required.
:-)
Best regards,
Carsten
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