On 11 oct, 02:59, zhango <[EMAIL PROTECTED]> wrote:
> I'm overriding a model's save() method, and I want to detect changes
> in values for some of the model's fields (i.e. differences between the
> unsaved instance's values for some fields, and the values for those
> same fields currently in the database and about to be overwritten).
> Is it possible to do this, and if so, how?
class Yadda(models.Model):
blah = models.CharField(max_length=32)
def __unicode__(self):
return u"%s" % self.blah
def __init__(self, *args, **kw):
print "yadda __init__", args, kw
super(Yadda, self).__init__(*args, **kw)
self._old_blah = self.blah
def save(self, **kw):
print "yadda save"
if self.blah != self._old_blah:
print "blah changed - was : %s - now : %s" %
(self._old_blah, self.blah)
super(Yadda, self).save(**kw)
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