overwrite field value in subclasses

Hi all,

One piece of my model is as follow :

class UpperAbstract(models.Model):

  CHOICE_A = 0

  CHOICE_B = 1

  CHOICE_C = 2

  myfield = models.PositiveSmallIntegerField(choices=((CHOICE_A,'A'),(CHOICE_B,"B"),(CHOICE_C,"C")),blank=False)

  class Meta:

abstract = True

class Foo(UpperAbstract):

      myfield = UpperAbstract.CHOICE_A

I am expecting any instance of Foo being created, to have 'myfield' always and "automatically" set to UpperAbstract.CHOICE_A

In my test the created object as null value and saving it is refused on IntegrityError because 'myfield' cannot be None

thank in advance for any help.

regards

manu

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