问题
I'm getting an error when performing a migration after introducing a new app (django-allauth). I'm not sure what else to try in order to fix the error. I've tried a few things but they don't seem to help unfortunately.
when running manage.py migrate:
File "D:\Python27\Lib\site-packages\django\db\migrations\state.py", line 71,
in render raise
InvalidBasesError("Cannot resolve bases for %r\nThis can happen if you are inheriting
models from an app with migrations (e.g. contrib.auth)\n in an app with no migrations;
see https://docs.djangoproject.com/en/1.7/topics/migrations/#dependencies for more" %
new_unrendered_models)
django.db.migrations.state.InvalidBasesError: Cannot resolve bases for
[<ModelState: 'blog.BlogPage'>, <ModelState: 'blog.BlogIndexPage'>]
This can happen if you are inheriting models from an app with migrations
(e.g. contrib.auth) in an app with no migrations; see
https://docs.djangoproject.com/en/1.7/topics/migrations/#dependencies for more
models.py
from django.db import models
from wagtail.wagtailcore.models import Page, Orderable
from wagtail.wagtailcore.fields import RichTextField
from wagtail.wagtailadmin.edit_handlers import FieldPanel ,MultiFieldPanel,InlinePanel, PageChooserPanel
from modelcluster.fields import ParentalKey
class BlogPage(Page):
body = RichTextField()
date = models.DateField("Post date")
indexed_fields = ('body', )
search_name = "Blog Page"
BlogPage.content_panels = [
FieldPanel('title', classname="full title"),
FieldPanel('date'),
FieldPanel('body', classname="full"),
]
class LinkFields(models.Model):
link_page = models.ForeignKey(
'wagtailcore.Page',
null=True,
blank=True,
related_name='+'
)
panels = [
PageChooserPanel('link_page'),
]
class Meta:
abstract = True
class RelatedLink(LinkFields):
title = models.CharField(max_length=255, help_text="Link title")
panels = [
FieldPanel('title'),
MultiFieldPanel(LinkFields.panels, "Link"),
]
class Meta:
abstract = True
class BlogIndexPageRelatedLink(Orderable, RelatedLink):
page = ParentalKey('blog.BlogIndexPage', related_name='related_links')
class BlogIndexPage(Page):
intro = models.CharField(max_length=256)
indexed_fields = ('body', )
search_name = "Blog Index Page"
BlogIndexPage.content_panels = [
FieldPanel('title', classname="full title"),
FieldPanel('intro', classname="full"),
InlinePanel(BlogIndexPage, 'related_links', label="Related links"),
]
What I've tried so far:
- followed the advice here: https://stackoverflow.com/a/25858659 however this has not changed anything for me.
- I've also tried https://code.djangoproject.com/ticket/22051#comment:12 with no success.
note: makemigrations runs (no changes detected) but migrate fails.
platform setup: This is currently on Django 1.7.1 on a Windows box. django-allauth runs successfully within other apps on this box.
Has anyone come across this before and is there a fix?
thanks in advance
---issued command sequence below:
(env) D:\git\rebootv2.1\blog>python manage.py migrate
D:\Python27\Lib\site-packages\treebeard\mp_tree.py:102: RemovedInDjango18Warning: `MP_NodeManager.get_query_set` method
should be renamed `get_queryset`.
class MP_NodeManager(models.Manager):
Operations to perform:
Synchronize unmigrated apps: account, allauth, modelcluster, blog, compressor, facebook, wagtailsnippets, socialaccount
Apply all migrations: core, wagtailusers, wagtailembeds, wagtailadmin, sessions, admin, wagtailcore, sites, auth, contenttypes, wagtaildocs, taggit, wagtailsearch, wagtailforms, wagtailredirects, wagtailimages
Synchronizing apps without migrations:
Creating tables...
Installing custom SQL...
Installing indexes...
Running migrations:
Applying sites.0001_initial...Traceback (most recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "D:\Python27\Lib\site-packages\django\core\management\__init__.py", line 385, in execute_from_command_line
utility.execute()
File "D:\Python27\Lib\site-packages\django\core\management\__init__.py", line 377, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "D:\Python27\Lib\site-packages\django\core\management\base.py", line 288, in run_from_argv
self.execute(*args, **options.__dict__)
File "D:\Python27\Lib\site-packages\django\core\management\base.py", line 338, in execute
output = self.handle(*args, **options)
File "D:\Python27\Lib\site-packages\django\core\management\commands\migrate.py", line 160, in handle
executor.migrate(targets, plan, fake=options.get("fake", False))
File "D:\Python27\Lib\site-packages\django\db\migrations\executor.py", line 63, in migrate
self.apply_migration(migration, fake=fake)
File "D:\Python27\Lib\site-packages\django\db\migrations\executor.py", line 91, in apply_migration
if self.detect_soft_applied(migration):
File "D:\Python27\Lib\site-packages\django\db\migrations\executor.py", line 135, in detect_soft_applied
apps = project_state.render()
File "D:\Python27\Lib\site-packages\django\db\migrations\state.py", line 71, in render raise InvalidBasesError("Cannot resolve bases for %r\nThis can happen if you are inheriting models from an app with migrations (e.g. contrib.auth)\n in an app with no migrations; see https://docs.djangoproject.com/en/1.7/topics/migrations/#dependencies for more" % new_unrendered_models)
django.db.migrations.state.InvalidBasesError: Cannot resolve bases for [<ModelState: 'blog.BlogPage'>, <ModelState: 'blog.BlogIndexPage'>]
This can happen if you are inheriting models from an app with migrations (e.g. contrib.auth)
in an app with no migrations; see https://docs.djangoproject.com/en/1.7/topics/migrations/#dependencies for more
(env) D:\git\rebootv2.1\blog>python manage.py makemigrations
D:\Python27\Lib\site-packages\treebeard\mp_tree.py:102: RemovedInDjango18Warning: `MP_NodeManager.get_query_set` method
should be renamed `get_queryset`.
class MP_NodeManager(models.Manager):
No changes detected
[what fixed this for me] - ended up being a problem with sequencing I guess....
- disable all of the allauth apps within INSTALLED_APPS in settings.py
- run manage.py migrate enable all of the allauth apps and disable the wagtail app that was generated for the project (e.g. blog)
- run manage.py migrate again enable both sets of apps in INSTALLED_APPS
- run manage.py migrate again
seems to be happy now.
hope this helps someone and saves them some time!
回答1:
ended up being a problem with sequencing I guess....
- disable all of the allauth apps within INSTALLED_APPS in settings.py
- run manage.py migrate enable all of the allauth apps and disable the wagtail app that was generated for the project (e.g. blog)
- run manage.py migrate again enable both sets of apps in INSTALLED_APPS
- run manage.py migrate again
seems to be happy now.
hope this helps someone and saves them some time!
回答2:
I had the error Cannot resolve bases for ... This can happen if you are inheriting models from an app with migrations as well. It was caused because python manage.py makemigrations did not create any migration files. This was because I had no migrations folder. After I added that folder (and an empty __init__.py inside) all worked well.
回答3:
I encountered this while trying to get the wagtail demo working (without trying to install 3rd party apps). Because the error was in treebeard, I guessed that there might be a newer version available. Sure enough, this did the trick:
pip uninstall django-treebeard
pip install django-treebeard==3.0
And now I can run this command in the wagtail demo setup without error:
./manage.py load_initial_data
回答4:
In my case, I created the model inheriting from auth.models.User
class User(auth.models.User, auth.models.PermissionsMixin):
def __str__(self):
return "@{}".format(self.username)
That is the cause of the error.
Solution:
Disable(comments) that model => run migrate => enable that model => run migrate again. It should work.
来源：https://stackoverflow.com/questions/27261030/migration-error-with-django-1-7-1