With Django==2.0, a RenameField on a model which has a reverse many to many
relationship raises an exception:
AttributeError: 'ManyToManyRel' object has no attribute 'field_name'
The same migration with Django==1.11 terminates successfully.
Migrations are automatically generated by `manage.py makemigrations`.
Am I missing something?
Below the code and the commands to reproduce the problem:
# myapp/models.py
from django.db import models
class ModelA(models.Model):
new_name = models.IntegerField()
class ModelB(models.Model):
model_as = models.ManyToManyField('ModelA')
# myapp/migrations/0001_initial.py
from django.db import migrations, models
class Migration(migrations.Migration):
initial = True
dependencies = [
]
operations = [
migrations.CreateModel(
name='ModelA',
fields=[
('id', models.AutoField(auto_created=True,
primary_key=True, serialize=False, verbose_name='ID')),
('old_name', models.IntegerField()),
],
),
migrations.CreateModel(
name='ModelB',
fields=[
('id', models.AutoField(auto_created=True,
primary_key=True, serialize=False, verbose_name='ID')),
('model_as', models.ManyToManyField(to='myapp.ModelA')),
],
),
]
# myapp/migrations/0002_auto_20171204_1012.py
from django.db import migrations
class Migration(migrations.Migration):
dependencies = [
('myapp', '0001_initial'),
]
operations = [
migrations.RenameField(
model_name='modela',
old_name='old_name',
new_name='new_name',
),
]
$ ./manage.py migrate
Operations to perform:
Apply all migrations: admin, auth, contenttypes, myapp, sessions
Running migrations:
Applying contenttypes.0001_initial... OK
Applying auth.0001_initial... OK
Applying admin.0001_initial... OK
Applying admin.0002_logentry_remove_auto_add... OK
Applying contenttypes.0002_remove_content_type_name... OK
Applying auth.0002_alter_permission_name_max_length... OK
Applying auth.0003_alter_user_email_max_length... OK
Applying auth.0004_alter_user_username_opts... OK
Applying auth.0005_alter_user_last_login_null... OK
Applying auth.0006_require_contenttypes_0002... OK
Applying auth.0007_alter_validators_add_error_messages... OK
Applying auth.0008_alter_user_username_max_length... OK
Applying auth.0009_alter_user_last_name_max_length... OK
Applying myapp.0001_initial... OK
Applying myapp.0002_auto_20171204_1012...Traceback (most recent call
last):
File "./manage.py", line 15, in <module>
execute_from_command_line(sys.argv)
File
"/home/edg/src/example/env/lib/python3.6/site-packages/django/core/management/__init__.py",
line 371, in execute_from_command_line
utility.execute()
File
"/home/edg/src/example/env/lib/python3.6/site-packages/django/core/management/__init__.py",
line 365, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File
"/home/edg/src/example/env/lib/python3.6/site-packages/django/core/management/base.py",
line 288, in run_from_argv
self.execute(*args, **cmd_options)
File
"/home/edg/src/example/env/lib/python3.6/site-packages/django/core/management/base.py",
line 335, in execute
output = self.handle(*args, **options)
File
"/home/edg/src/example/env/lib/python3.6/site-packages/django/core/management/commands/migrate.py",
line 200, in handle
fake_initial=fake_initial,
File
"/home/edg/src/example/env/lib/python3.6/site-packages/django/db/migrations/executor.py",
line 117, in migrate
state = self._migrate_all_forwards(state, plan, full_plan, fake=fake,
fake_initial=fake_initial)
File
"/home/edg/src/example/env/lib/python3.6/site-packages/django/db/migrations/executor.py",
line 147, in _migrate_all_forwards
state = self.apply_migration(state, migration, fake=fake,
fake_initial=fake_initial)
File
"/home/edg/src/example/env/lib/python3.6/site-packages/django/db/migrations/executor.py",
line 244, in apply_migration
state = migration.apply(state, schema_editor)
File
"/home/edg/src/example/env/lib/python3.6/site-packages/django/db/migrations/migration.py",
line 122, in apply
operation.database_forwards(self.app_label, schema_editor, old_state,
project_state)
File
"/home/edg/src/example/env/lib/python3.6/site-packages/django/db/migrations/operations/fields.py",
line 304, in database_forwards
to_model._meta.get_field(self.new_name),
File
"/home/edg/src/example/env/lib/python3.6/site-packages/django/db/backends/sqlite3/schema.py",
line 81, in alter_field
any(r.field_name == old_field.name for r in
model._meta.related_objects)):
File
"/home/edg/src/example/env/lib/python3.6/site-packages/django/db/backends/sqlite3/schema.py",
line 81, in <genexpr>
any(r.field_name == old_field.name for r in
model._meta.related_objects)):
AttributeError: 'ManyToManyRel' object has no attribute 'field_name'
$ pip freeze
Django==2.0
pytz==2017.3
--
You received this message because you are subscribed to the Google Groups
"Django users" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to django-users+unsubscr...@googlegroups.com.
To post to this group, send email to django-users@googlegroups.com.
Visit this group at https://groups.google.com/group/django-users.
To view this discussion on the web visit
https://groups.google.com/d/msgid/django-users/4c3ceae2-9576-47f4-a083-5129889dd238%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
