问题
After I install Django-userena,there is an error my django version :1.9.5 I just install django-userena step by step ,but when i migrate it ,an error happend and I don't how to solve it.
Traceback (most recent call last):
File "manage.py", line 12, in <module>
execute_from_command_line(sys.argv)
File "C:\Python27\lib\site-packages\django\core\management\__init__.py", line 353, in execute_from_command_line
utility.execute()
File "C:\Python27\lib\site-packages\django\core\management\__init__.py", line 345, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "C:\Python27\lib\site-packages\django\core\management\base.py", line 348, in run_from_argv
self.execute(*args, **cmd_options)
File "C:\Python27\lib\site-packages\django\core\management\base.py", line 399, in execute
output = self.handle(*args, **options)
File "C:\Python27\lib\site-packages\django\core\management\commands\migrate.py", line 204, in handle
emit_post_migrate_signal(self.verbosity, self.interactive, connection.alias)
File "C:\Python27\lib\site-packages\django\core\management\sql.py", line 50, in emit_post_migrate_signal
using=db)
File "C:\Python27\lib\site-packages\django\dispatch\dispatcher.py", line 192, in send
response = receiver(signal=self, sender=sender, **named)
File "C:\Python27\lib\site-packages\guardian\management\__init__.py", line 33, in create_anonymous_user
User.objects.get(**lookup)
File "C:\Python27\lib\site-packages\django\db\models\manager.py", line 122, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "C:\Python27\lib\site-packages\django\db\models\query.py", line 381, in get
num = len(clone)
File "C:\Python27\lib\site-packages\django\db\models\query.py", line 240, in __len__
self._fetch_all()
File "C:\Python27\lib\site-packages\django\db\models\query.py", line 1074, in _fetch_all
self._result_cache = list(self.iterator())
File "C:\Python27\lib\site-packages\django\db\models\query.py", line 52, in __iter__
results = compiler.execute_sql()
File "C:\Python27\lib\site-packages\django\db\models\sql\compiler.py", line 848, in execute_sql
cursor.execute(sql, params)
File "C:\Python27\lib\site-packages\django\db\backends\utils.py", line 79, in execute
return super(CursorDebugWrapper, self).execute(sql, params)
File "C:\Python27\lib\site-packages\django\db\backends\utils.py", line 64, in execute
return self.cursor.execute(sql, params)
File "C:\Python27\lib\site-packages\django\db\utils.py", line 95, in __exit__
six.reraise(dj_exc_type, dj_exc_value, traceback)
File "C:\Python27\lib\site-packages\django\db\backends\utils.py", line 64, in execute
return self.cursor.execute(sql, params)
File "C:\Python27\lib\site-packages\django\db\backends\sqlite3\base.py", line 323, in execute
return Database.Cursor.execute(self, query, params)
django.db.utils.OperationalError: no such table: auth_user
apps:
INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'django.contrib.sites',
'userena',
'guardian',
'easy_thumbnails',
'accounts',
]
回答1:
The problem is this line:
File "C:\Python27\lib\site-packages\guardian\management\__init__.py", line 33, in create_anonymous_user
User.objects.get(**lookup)
guardian\management\__init__.py
is calling User
before it is defined.
Why is it called before it is defined?
...well, it is called by makemigrations
to find out if there are changes in the db
to define them (the changes that are found)
...so this is a "chicken and egg" problem.
I have the same error with a similar problem but the offending code was my own code (not a library like guardian
)
My code was like this:
CHAT_BOT_USER, created = User.objects.get_or_create(username='rosty', \ email=settings.EMAIL_HOST_USER)
The offending part is the User
being used before the auth_user
table is created
I solved by only executing the code when the table is present. This happens when there is no OperationError
. And you can know it with a try/except
like this:
from django.db import OperationalError
try:
CHAT_BOT_USER, created = User.objects.get_or_create(username='rosty', email=settings.EMAIL_HOST_USER)
except OperationalError:
CHAT_BOT_USER = None
if created:
CHAT_BOT_USER.set_password(settings.EMAIL_HOST_PASSWORD)
CHAT_BOT_USER.save()
This way makemigrations
runs the except
code and runserver
runs the try
code.
Note the created
boolean, you may use any other way to avoid makemigration
run code that depends on the User.objects....
results
回答2:
./manage.py migrate
if your Django version is 1.9 or lower, use
./manage.py syncdb
then
python manage.py createsuperuser
more details on https://github.com/django/django/blob/master/django/contrib/auth/forms.py
May it help
回答3:
I was get same error and to fix the same, I checked if the mentioned table in error is present in connected DB or not. It was not. Applied migration again and it worked.
python manage.py migrate
python manage.py makemigrations
来源:https://stackoverflow.com/questions/39071093/django-db-utils-operationalerror-no-such-table-auth-user