Django custom Model.Fields

[Fabien Millerand]

Hi all,



down votefavorite 
<https://stackoverflow.com/questions/42011956/django-custom-model-fields#>

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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