id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
27742	Unexpected migration on Parent -> child model inheritence	Anthony King	nobody	"After upgrading to 1.11, migrations are generated on unchanged fields for parent pointers.


models.py
{{{#!python
class Parent(models.Model):
    pass


class Child(Parent):
    pass
}}}

initial_migration.py
{{{#!python
# -*- coding: utf-8 -*-
# Generated by Django 1.10.5 on 2017-01-18 11:06
from __future__ import unicode_literals

from django.db import migrations, models
import django.db.models.deletion


class Migration(migrations.Migration):

    dependencies = [
        ('app', '0263_previous_migration'),
    ]

    operations = [
        migrations.CreateModel(
            name='Parent',
            fields=[
                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
            ],
        ),
        migrations.CreateModel(
            name='Child',
            fields=[
                ('parent_ptr', models.OneToOneField(auto_created=True, on_delete=django.db.models.deletion.CASCADE, parent_link=True, primary_key=True, serialize=False, to='app.Parent')),
            ],
            bases=('app.parent',),
        ),
    ]

}}}


post upgrade migration.py

{{{#!python
# -*- coding: utf-8 -*-
# Generated by Django 1.11a1 on 2017-01-18 11:06
from __future__ import unicode_literals

from django.db import migrations, models
import django.db.models.deletion


class Migration(migrations.Migration):

    dependencies = [
        ('app', '0264_child_parent'),
    ]

    operations = [
        migrations.AlterField(
            model_name='child',
            name='parent_ptr',
            field=models.OneToOneField(auto_created=True, on_delete=django.db.models.deletion.CASCADE, parent_link=True, primary_key=True, to='app.Parent'),
        ),
    ]

}}}
"	Bug	closed	Migrations	1.11	Release blocker	fixed		João Paulo Melo de Sampaio	Accepted	0	0	0	0	0	0