Question

我试图将迁移应用于新数据库，但是我一直收到此错误，我删除了旧数据库中的所有迁移文件以及应用程序中的文件。当我尝试将迁移应用于新数据库或运行python manage.py runserver时，出现此错误..？我想知道可能是什么问题。正在使用Django 3.1.1

E:\All django project\Real-Estate-Django-Web-App-master>manage.py migrate
Traceback (most recent call last):
  File "E:\All django project\Real-Estate-Django-Web-App-master\manage.py", line 15, in <module>
    execute_from_command_line(sys.argv)
  File "C:\Python38\lib\site-packages\django\core\management\__init__.py", line 401, in execute_from_command_line
    utility.execute()
  File "C:\Python38\lib\site-packages\django\core\management\__init__.py", line 395, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "C:\Python38\lib\site-packages\django\core\management\base.py", line 330, in run_from_argv
    self.execute(*args, **cmd_options)
  File "C:\Python38\lib\site-packages\django\core\management\base.py", line 371, in execute
    output = self.handle(*args, **options)
  File "C:\Python38\lib\site-packages\django\core\management\base.py", line 85, in wrapped
    res = handle_func(*args, **kwargs)
  File "C:\Python38\lib\site-packages\django\core\management\commands\migrate.py", line 92, in handle
    executor = MigrationExecutor(connection, self.migration_progress_callback)
  File "C:\Python38\lib\site-packages\django\db\migrations\executor.py", line 18, in __init__
    self.loader = MigrationLoader(self.connection)
  File "C:\Python38\lib\site-packages\django\db\migrations\loader.py", line 53, in __init__
    self.build_graph()
  File "C:\Python38\lib\site-packages\django\db\migrations\loader.py", line 255, in build_graph
    self.graph.validate_consistency()
  File "C:\Python38\lib\site-packages\django\db\migrations\graph.py", line 195, in validate_consistency
    [n.raise_error() for n in self.node_map.values() if isinstance(n, DummyNode)]
  File "C:\Python38\lib\site-packages\django\db\migrations\graph.py", line 195, in <listcomp>
    [n.raise_error() for n in self.node_map.values() if isinstance(n, DummyNode)]
  File "C:\Python38\lib\site-packages\django\db\migrations\graph.py", line 58, in raise_error
    raise NodeNotFoundError(self.error_message, self.key, origin=self.origin)
django.db.migrations.exceptions.NodeNotFoundError: Migration auth.0013_user_following dependencies reference nonexistent parent node ('account', '0003_contact')

Answer 1

好吧！我终于能够解决问题，方法是先在虚拟环境中卸载Django，然后重做安装，但是问题仍然存在，因此我按照直觉删除了整个虚拟环境，然后进行了virtualenv的安装。安装了Django，它运行完美。感谢所有尝试提供帮助的人，我非常感谢您的回答。

Answer 2

auth.0013_user_following迁移需要0003_contact迁移，该迁移丢失。

尝试从所有应用中删除所有迁移并设置新数据库。

Answer 3

根据 Abubakari UmarblacKrussain Uma 提供的解决方案，我注意到链接到我的虚拟环境文件的包丢失/损坏。当我对照我的 requirements.text 文件检查它时，我注意到 Django 包被 django 2.2.27（django 小写）替换，并添加了一个条目 -jango 3.1.3。我手动编辑了 requirements.txt 文件以删除 -jango 3.1.3 条目并用 Django 3.1.3 替换 django 2.2.27 并从 requirements.txt。这解决了错误。为了更好地衡量，我为虚拟环境重新生成了 requirements.txt 文件。

删除数据库并尝试应用新的迁移后，出现此错误，提示为django.db.migrations.exceptions.NodeNotFoundError

3 个答案: