Just tried it, like this:
class MyModel(models.Model):
myfield = models.CharField(unique = True, blank = True, null =
True)
def save(self, force_insert = False, force_update = False):
if self.myfield == '':
self.myfield = None
super(MyModel, self).save(force_insert, force_update)
I still get integrity errors if I leave myfield blank. :(
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