For example, altering 'pana.our.org''s netgroups field, the following
save() method results in this debug line which makes no sense to me:
CHANGED: Device pana.our.org had old netgroups [{'name':
u'testnetgroup', 'desc': u''}] and now has new netgroups [{'name':
u'testnetgroup', 'desc': u''}]
Both the new and old netgroups in that line are identical and reflect
the NEW value. Working code would state:
CHANGED: Device pana.our.org had old netgroups [{'name':
u'testnetgroup', 'desc': u''}] and now has new netgroups []
class Device(models.Model):
# ...
netgroups = models.ManyToManyField(Netgroup,
null=True,
verbose_name="Netgroups",
blank=True)
# ...
def save(self, *args, **kwargs):
try:
#
# Get the THEORETICALLY old data from database for this
device
#
oldnetgroups =
Device.objects.get(pk=self.pk).netgroups.values_list()
except:
# This is likely a brand new device object, so can't look
it up
oldnetgroups = None
#
# Compare the THEORETICAL old netgroups value with the
theoretical new value
#
if (oldnetgroups != None) and (oldnetgroups !=
self.netgroups.values_list()):
prefix = 'CHANGED'
else:
prefix = 'UNCHANGED'
if oldnetgroups != None:
fd = open('/tmp/test.log', 'a')
fd.write('%s: Device %s had old netgroups %s and now has
new netgroups %s\n' % (prefix, self.name, oldnetgroups,
self.netgroups.values()))
fd.close()
super(Device, self).save(*args, **kwargs)
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