#24701: Migration created on python2.7 fail to load on python 3 due to
models.Manager
----------------------------+--------------------------------------
Reporter: aeby | Owner: nobody
Type: Bug | Status: new
Component: Migrations | Version: 1.8
Severity: Normal | Resolution:
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
----------------------------+--------------------------------------
Comment (by aeby):
=== On python 2.7 ===
''models.py''
{{{#!python
from django.db import models
class MyManager(models.Manager):
use_in_migrations = True
def something(self):
print('demo manager')
class MyModel(models.Model):
demo = models.BooleanField(default=True)
objects = MyManager()
}}}
''0001_initial.py''
{{{#!python
# -*- coding: utf-8 -*-
from __future__ import unicode_literals
from django.db import models, migrations
import demo.models
class Migration(migrations.Migration):
dependencies = [
]
operations = [
migrations.CreateModel(
name='MyModel',
fields=[
('id', models.AutoField(verbose_name='ID',
serialize=False, auto_created=True, primary_key=True)),
('demo', models.BooleanField(default=True)),
],
managers=[
(b'objects', demo.models.MyManager()),
],
),
]
}}}
=== On python 3.4 ===
''$ ./manage.py migrate demo''
{{{#!bash
Operations to perform:
Apply all migrations: demo
Running migrations:
Rendering model states...Traceback (most recent call last):
File "./manage.py", line 35, in <module>
execute_from_command_line(sys.argv)
File "/home/aeby/code/myproject/venv/lib/python3.4/site-
packages/django/core/management/__init__.py", line 338, in
execute_from_command_line
utility.execute()
File "/home/aeby/code/myproject/venv/lib/python3.4/site-
packages/django/core/management/__init__.py", line 330, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/aeby/code/myproject/venv/lib/python3.4/site-
packages/django/core/management/base.py", line 390, in run_from_argv
self.execute(*args, **cmd_options)
File "/home/aeby/code/myproject/venv/lib/python3.4/site-
packages/django/core/management/base.py", line 441, in execute
output = self.handle(*args, **options)
File "/home/aeby/code/myproject/venv/lib/python3.4/site-
packages/django/core/management/commands/migrate.py", line 221, in handle
executor.migrate(targets, plan, fake=fake, fake_initial=fake_initial)
File "/home/aeby/code/myproject/venv/lib/python3.4/site-
packages/django/db/migrations/executor.py", line 104, in migrate
state = migration.mutate_state(state, preserve=do_run)
File "/home/aeby/code/myproject/venv/lib/python3.4/site-
packages/django/db/migrations/migration.py", line 83, in mutate_state
operation.state_forwards(self.app_label, new_state)
File "/home/aeby/code/myproject/venv/lib/python3.4/site-
packages/django/db/migrations/operations/models.py", line 53, in
state_forwards
list(self.managers),
File "/home/aeby/code/myproject/venv/lib/python3.4/site-
packages/django/db/migrations/state.py", line 81, in add_model
self.reload_model(app_label, model_name)
File "/home/aeby/code/myproject/venv/lib/python3.4/site-
packages/django/db/migrations/state.py", line 140, in reload_model
self.apps.render_multiple(states_to_be_rendered)
File "/home/aeby/code/myproject/venv/lib/python3.4/site-
packages/django/db/migrations/state.py", line 250, in render_multiple
model.render(self)
File "/home/aeby/code/myproject/venv/lib/python3.4/site-
packages/django/db/migrations/state.py", line 533, in render
body,
File "/home/aeby/code/myproject/venv/lib/python3.4/site-
packages/django/db/models/base.py", line 189, in __new__
new_class.add_to_class(obj_name, obj)
File "/home/aeby/code/myproject/venv/lib/python3.4/site-
packages/django/db/models/base.py", line 324, in add_to_class
value.contribute_to_class(cls, name)
File "/home/aeby/code/myproject/venv/lib/python3.4/site-
packages/django/db/models/manager.py", line 169, in contribute_to_class
setattr(model, name, ManagerDescriptor(self))
TypeError: attribute name must be string, not 'bytes'
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/24701#comment:2>
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