How do I ensure that a blank InlineModelAdmin is saved when the parent
form is submitted? Here's a simplified version of my code:
####
class Flagset(Model):
group = OneToOneField(Group)
flag = BooleanField()
class FlagsetInline(TabularInline):
model = Flagset
class GroupAdmin(ModelAdmin):
inlines = [FlagsetInline]
admin.site.unregister(Group)
admin.site.register(Group, GroupAdmin)
####
When I save a new Group, I want a Flagset to be created whether the
Flagset.flag box is checked or not. If I leave it blank, no object is
created. I tried adding a signal handler like the following to create
the object:
####
@receiver(post_save, sender=Group)
def create_flagset(sender, **kwargs):
if kwargs['created']:
Flagset.objects.get_or_create(group=kwargs['instance'])
####
This works when the flag is not set, but causes an error if it is
(because the Flagset is created twice, it looks like).
What can I do to make this scenario work whether the inline is touched
or not?
Thanks,
Dan
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