I inherited a Django app without the migration files. I suppose the app was developed with an older Django version that the one on the server.

The first time python manage.py makemigrations is executed it is successful and produces 0001_initial.py file

Migration (python manage.py migrate) or new executions of makemigrations
with existent 0001_initial.py fail with a weird error:

 File "/afat/afatprivate/AFATdashboard/migrations/0001_initial.py", line 223, in Migration
bases=(models.Model, AFATdashboard.models.__support),
AttributeError: module 'AFATdashboard.models' has no attribute '_Migration__support'

I searched for _Migration__support and found nothing useful.

The error is the same with an empty database too, so this related answer didn’t solve the problem

Code from 0001_initial.py, last line is 223

 migrations.CreateModel(
        name='EconCostoCorpiIdrici3',
        fields=[
            ('waterbodycode', models.CharField(blank=True, db_column='waterBodyCode', max_length=255, null=True)),
            ('waterbodyname', models.CharField(blank=True, db_column='waterBodyName', max_length=255, null=True)),
            ('numinterventi', models.BigIntegerField(blank=True, db_column='numInterventi', null=True)),
            ('numinterventiconcosto', models.BigIntegerField(blank=True, db_column='numInterventiConCosto', null=True)),
            ('costocorpoidrico2227', models.DecimalField(blank=True, db_column='costoCorpoIdrico2227', decimal_places=65535, max_digits=65535, null=True)),
            ('coperturafinanziariacorpoidrico', models.DecimalField(blank=True, db_column='coperturaFinanziariaCorpoIdrico', decimal_places=65535, max_digits=65535, null=True)),
            ('percentualecoperturafinanziaria', models.DecimalField(blank=True, db_column='percentualeCoperturaFinanziaria', decimal_places=65535, max_digits=65535, null=True)),
            ('waterbodycostconfidence', models.DecimalField(blank=True, db_column='waterBodyCostConfidence', decimal_places=65535, max_digits=65535, null=True)),
            ('costocorpoidrico2227color', models.TextField(blank=True, db_column='costoCorpoIdrico2227Color', null=True)),
            ('recid', models.TextField(db_column='recId', primary_key=True, serialize=False)),
        ],
        options={
            'db_table': 'ECON_costo_corpi_idrici_3',
            'managed': False,
        },
        bases=(models.Model, AFATdashboard.models.__support),
    ),

What can I do ?

UPDATE 1

My models.py starts this way:

class __support:

I’m wondering if support has become a keyword

Besides I’m testing a reduced model.py and I’m finding other errors. Most DecimalFields have these attributes:

decimal_places=65535, max_digits=65535

and I suspect these numbers are too high to be supported.