I've now had to learn this the hard way by having real live data
deleted from my database on two production projects and it pisses me
off big time every time.
I can accept that NOT nullable foreign relations cascade the delete
but not if they have null=True on them. Example:
class Survey(Models):
...
class Analysis(Models):
survey = ForeignKey(Survey, null=True)
Just looking at that it's to be fairly obvious that on deleting a
Survey instance it should nullify the foreign key relation on the
Analysis model. Not delete it!
On a perhaps unrelated note is it a bug that I can't prevent this with
signals? This doesn't work:
def disconnect(sender, instance, **kwargs):
for each in Analysis.objects.filter(survey=instance):
each.survey = None
each.save()
pre_delete.connect(disconnect, sender=Survey)
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