Models Mixin Inherit Many to Many

Hello,

i need a mixin where i can inherit many to many like this:

mixin.py:

class RightsModelRelation(models.Model):

    user_link = models.ForeignKey(User, on_delete=models.CASCADE, blank=False, null=False, default=None,

                                    related_name="%(class)s_rights_user")

    right_to_view = models.BooleanField(default=True)

    right_to_change = models.BooleanField(default=False)

    right_to_delete = models.BooleanField(default=False)

class RightsModelMixin(models.Model):

    owner = models.ForeignKey(User, on_delete=models.CASCADE, null=False, default=None,

                              related_name="%(class)s_owner", )

    rights_link = models.ManyToManyField(RightsModelRelation, default=None,

                                         related_name="%(class)s_rights_link")

and in my normal model.py i want:

class Address(RightsModelMixin,models.Model):

    lastname = models.CharField(max_length=255, default="", )

    firstname = models.CharField(max_length=255, default="", blank=True, null=True)

On migrations i get:

You are trying to add a non-nullable field 'rightsmodelmixin_ptr' to address without a default; we can't do that (the database needs something to populate existing rows).

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