not very nice, and probably not pythonic (still learning) but now I added
another two for loops to find old references and delete them:
if action == "post_add":
if isinstance(instance, Database):
# then update pairs
for a in instance.audioData():
for q in instance.questions.all():
pair = AudioQuestionPair.objects.get_or_create(audioData
=a, question=q, database=instance)
for choice in q.get_choices():
answer = Answer.objects.get_or_create(body=choice,
audioQuestionPair=pair[0])
# check for removed questions and delete pairs
pairs = AudioQuestionPair.objects.filter(database=instance)
toDelete = []
for pair in pairs:
if pair.question not in instance.questions.all():
toDelete.append(pair)
for item in toDelete:
item.delete()
On Friday, January 30, 2015 at 9:44:29 PM UTC+1, Tobias Dacoir wrote:
>
> I have a many-to-many relationship which the Admin can change using the
> Admin Site. I use a ModelAdmin.filter_horizontal, but even with the default
> widget it's the same.
>
> I registered a receiver when m2m_changed, however it always only calls:
> pre_clear, post_clear, pre_add, post_add, in that order.
>
> Now for post_add I have code to execute, to create new objects in the
> database, however when a value is removed from this many-to-many field, I
> need to delete some objects. Since pre_remove is never called, I can't tell
> which value was removed and I'm unable to find out which objects to delete.
>
> Is there a way to modify the Admin page to actually call remove / add on
> the Model? Or I need another way to find out which value was removed.
>
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