更新Django - 错误:'没有名为migration的模块'

Question

我正在将我的Django App从Django 1.5.5 tot 1.9升级,Django-cms从2.4.3升级到3.3(以及所有相应的软件包).

在我仔细研究了折旧函数的所有错误之后,我现在偶然发现了一个我无法理解的错误:'没有名为migration的模块'

我在运行时遇到这个错误(在virtualenv中): - python manage.py runserver以及运行时 - python manage.py migrate

Traceback (most recent call last):
  File "manage.py", line 20, in <module>
    execute_from_command_line(sys.argv)
  File "/var/www/env/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 350, in execute_from_command_line
    utility.execute()
  File "/var/www/env/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 342, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/var/www/env/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 195, in fetch_command
    klass = load_command_class(app_name, subcommand)
  File "/var/www/env/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 39, in load_command_class
    module = import_module('%s.management.commands.%s' % (app_name, name))
  File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
  File "/var/www/env/local/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 16, in <module>
    from django.db.migrations.autodetector import MigrationAutodetector
  File "/var/www/env/local/lib/python2.7/site-packages/django/db/migrations/__init__.py", line 1, in <module>
    from .migration import Migration, swappable_dependency  # NOQA
ImportError: No module named migration

manage.py

#!/usr/bin/env python2
import os
import sys

if __name__ == "__main__":

    settings_module_path = 'ais.settings.production'
    ########## Attempt to override settings using local settings
    try:
        from ais.settings.local_settings import *
        # For developmentent, file will probably hold the following:
        settings_module_path = 'ais.settings.development'
        print "!!!manage.py settings overwritten!!!"
    except ImportError:
        pass
    os.environ['DJANGO_SETTINGS_MODULE'] = settings_module_path

    from django.core.management import execute_from_command_line

    execute_from_command_line(sys.argv)

migrate.sh

#!/bin/sh
echo "Starting ..."

echo ">> Deleting old migrations"
find . -path "*/migrations/*.py" -not -name "__init__.py" -delete
find . -path "*/migrations/*.pyc"  -delete


# Optional
echo ">> Deleting sqlite  (if exists) database"
find . -name "db.sqlite3" -delete

echo ">> Running manage.py makemigrations"
python manage.py makemigrations

echo ">> Running manage.py migrate"
python manage.py migrate

echo ">> Done"

Answer 1

您的脚本似乎是问题所在.它试图删除您的迁移,但它实际上也删除了Django /django/db/migrations/文件的内容.请注意,它显式不会删除__init__.py文件,但会删除其他文件.

一种选择就是删除这些行:

echo ">> Deleting old migrations" 
find . -path "*/migrations/*.py" -not -name "__init__.py" -delete 
find . -path "*/migrations/*.pyc"  -delete

一旦你在生产中运行Django,你不应该删除旧的迁移,因为你可能想要为迁移添加自定义代码.这看起来像是开发的便利脚本.

Answer 2

如果您的错误仍然如下:

 from .migration import Migration, swappable_dependency  # NOQA
ImportError: No module named 'django.db.migrations.migration'

你需要重新安装dajngo

检查Django版本,然后强制重新安装它

python -m django --version

pip install --upgrade --force-reinstall包

  pip install --upgrade --force-reinstall  Django==2.0.5

Answer 3

正如@YPCrumble 指出的那样，您的“>> 删除旧迁移”脚本也删除了/django/db/migrations/文件。要恢复它，您需要卸载 Django 并重新安装它。