Can't set id if model inherits from non-abstract model

Two kinds of problems here (the cause is probably the same):

class A(models.Model):
    id = models.CharField(max_length=50, primary_key=True)

class B(A):
    pass

Expected :id for b
Actual   :DFKYQIC7NU2NOPVAL2CV5I4JZJPIHA5BP9BHGOWFEX4X825Q5T

    @pytest.mark.django_db
    def test_setting_id():
        from smartpatient.events.models import A, B

        a = N(A, id='id for a')
        assert a.id == 'id for a'
        b = N(B, id='id for b')
>       assert b.id == 'id for b'
E       AssertionError: assert 'DFKYQIC7NU2NOPVAL2CV5I4JZJPIHA5BP9BHGOWFEX4X825Q5T' == 'id for b'

G has the same problem.

If I leave the A.id field default, then:

class A(models.Model):
    pass

class B(A):
    pass

    @pytest.mark.django_db
    def test_setting_id():
        from smartpatient.events.models import A, B

        a = N(A, id=555)
        assert a.id == 555
>       b = N(B, id=666)

(...)

self = <_mysql.connection open to 'mysql-all' at 0x3b65bb8>
query = b'INSERT INTO `events_a` (`id`) VALUES (DEFAULT)'

    def query(self, query):
        # Since _mysql releases GIL while querying, we need immutable buffer.
        if isinstance(query, bytearray):
            query = bytes(query)
>       _mysql.connection.query(self, query)
E       django_dynamic_fixture.ddf.BadDataError: ('events.models.A', IntegrityError(1364, "Field 'id' doesn't have a default value"))

../.virtualenvs/venv3.6/lib/python3.6/site-packages/MySQLdb/connections.py:224: BadDataError

Python 3.6 Django 2.0.13 DDF 2.0.0 (the same problems with 3.1.1)

It worked before the upgrade from Django 1.11.29 and DDF 1.9.5. I suspect the changes in Django broke this functionality in DDF.

Thanks in advance for fixing this! DDF is very, very useful and convenient for testing, generating sample data, and whatnot. Big kudos to all contributors!

paulocheque / django-dynamic-fixture

Can't set id if model inherits from non-abstract model #138