Django custom Model.Fields

Hi all,

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I am trying to create a Model Fields that is basically a AutoField, but in base 36. Here my definition: class AutoBase36Field(models.AutoField): description = _("AutoField on base36") @staticmethod def base36encode(number): try: number = int(number) except: raise TypeError('number must be an integer') if not isinstance(number, int): raise TypeError('number must be an integer') if number < 0: raise ValueError('number must be positive') alphabet, base36 = ['0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ', ''] while number: number, i = divmod(number, 36) base36 = alphabet[i] + base36 return base36 or alphabet[0] @staticmethod def base36decode(string): if string is None: return None return int(string, 36) def to_python(self, value): if value is None: return value try: return self.base36encode(value) except (TypeError, ValueError): raise exceptions.ValidationError( self.error_messages['invalid'], code='invalid', params={'value': value}, ) def from_db_value(self, value, expression, connection, context): if value is None: return value return self.base36encode(value) def get_prep_value(self, value): if value is None: return None return self.base36decode(value) And here is a Model class I am using: class Content(models.Model): mzk_id = AutoBase36Field(auto_created=True, primary_key=True, serialize=False, verbose_name='ID') name = models.TextField() I have a test failing: def test_incrementation_of_content_mzk_id(self): content1 = Content(name="a") content1.save() mzk_id_1 = int(content1.mzk_id, 36) As mzk_id is kept as an integer. Basically when creating the incremented field, Django doesn't go through to_python()... I am not sure why... Does anyone could help me up?

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