django.db.utils.OperationalError when remove the parent model

[Cheng-Hung Hsueh]

My original models like this

class A(models.Model):
    data = models.CharField(max_length=30)

class B(models.Model):
    pass

Make migrations, then I modified the artitecture

class A(models.Model):
    data = models.CharField(max_length=30)

class B(models.Model):
    pass

Make migration and migrate.

get the error:

  File "/..../lib/python3.4/site-packages/django/db/backends/sqlite3/base.py", line 323, in execute
    return Database.Cursor.execute(self, query, params)
django.db.utils.OperationalError: near ")": syntax error

Is it a bug?

Env:
django 1.10.1

[Cheng-Hung Hsueh]

The sample project: https://github.com/sih4sing5hong5/django_migration_error

[Simon Charette]

Hi Cheng-Hung,

This is know bug[1]

Simon

[1] https://code.djangoproject.com/ticket/24424

Le mardi 13 septembre 2016 22:02:54 UTC-4, Cheng-Hung Hsueh a écrit :

The sample project: https://github.com/sih4sing5hong5/django_migration_error

[Cheng-Hung Hsueh]

I tyied with some new filed in model B.

class A(models.Model):
    data = models.CharField(max_length=30)

class B(A):
    data2 = models.CharField(max_length=30)

to

class A(models.Model):
    data = models.CharField(max_length=30)


class B(models.Model):

    data2 = models.CharField(max_length=30)

migrated and got

  File "/.../lib/python3.4/site-packages/django/db/models/base.py", line 226, in __new__
    base.__name__,
django.core.exceptions.FieldError: Local field 'id' in class 'B' clashes with field of the same name from base class 'A'.