Django South迁移错误答案

【问题标题】：Django South migration errorDjango South迁移错误
【发布时间】：2012-08-06 15:03:53
【问题描述】：

我在尝试应用第一次南迁移时遇到错误。我尝试了各种建议（例如删除迁移文件夹中的 .pyc 文件，转换应用程序以及尝试重新启动它，其他小提琴）。有人可以在这里建议我可以做什么吗？谢谢

(env)~/code/django/ssc/dev/ssc/ssc> python manage.py migrate
Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 443, in execute_from_command_line
    utility.execute()
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 382, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 196, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 232, in execute
    output = self.handle(*args, **options)
  File "/usr/local/lib/python2.7/dist-packages/south/management/commands/migrate.py", line 108, in handle
    ignore_ghosts = ignore_ghosts,
  File "/usr/local/lib/python2.7/dist-packages/south/migration/__init__.py", line 166, in migrate_app
    Migrations.calculate_dependencies()
  File "/usr/local/lib/python2.7/dist-packages/south/migration/base.py", line 228, in calculate_dependencies
    migration.calculate_dependencies()
  File "/usr/local/lib/python2.7/dist-packages/south/migration/base.py", line 362, in calculate_dependencies
    for migration in self._get_dependency_objects("depends_on"):
  File "/usr/local/lib/python2.7/dist-packages/south/migration/base.py", line 342, in _get_dependency_objects
    for app, name in getattr(self.migration_class(), attrname, []):
  File "/usr/local/lib/python2.7/dist-packages/south/migration/base.py", line 314, in migration_class
    return self.migration().Migration
AttributeError: 'module' object has no attribute 'Migration'
(env)~/code/django/ssc/dev/ssc/ssc> python manage.py convert_to_south crewcal
This application is already managed by South.
(env)~/code/django/ssc/dev/ssc/ssc> python manage.py migrateTraceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 443, in execute_from_command_line
    utility.execute()
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 382, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 196, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 232, in execute
    output = self.handle(*args, **options)
  File "/usr/local/lib/python2.7/dist-packages/south/management/commands/migrate.py", line 108, in handle
    ignore_ghosts = ignore_ghosts,
  File "/usr/local/lib/python2.7/dist-packages/south/migration/__init__.py", line 166, in migrate_app
    Migrations.calculate_dependencies()
  File "/usr/local/lib/python2.7/dist-packages/south/migration/base.py", line 228, in calculate_dependencies
    migration.calculate_dependencies()
  File "/usr/local/lib/python2.7/dist-packages/south/migration/base.py", line 362, in calculate_dependencies
    for migration in self._get_dependency_objects("depends_on"):
  File "/usr/local/lib/python2.7/dist-packages/south/migration/base.py", line 342, in _get_dependency_objects
    for app, name in getattr(self.migration_class(), attrname, []):
  File "/usr/local/lib/python2.7/dist-packages/south/migration/base.py", line 314, in migration_class
    return self.migration().Migration
AttributeError: 'module' object has no attribute 'Migration'

【问题讨论】：

您是否真的创建了迁移？ python manage.py schemamigration --initial
你看到了吗：south.aeracode.org/ticket/819
代码在特定的迁移甚至特定的应用程序上都没有失败——它永远不会走那么远。要么你的 South 包有问题，要么你有某种令人毛骨悚然的现成项目结构。尝试删除并重新安装 South，如果您对模型或应用程序的布局方式有任何异常，请在您的问题中注明。
愚蠢的问题（发生在我身上一次）：迁移文件夹中有 init.py 文件吗？
再次重新安装，一切正常。摆弄的事情。感谢您的关注。

标签： django django-south

【解决方案1】：

可能有点晚了，但还是... 您的迁移包中是否有任何其他包（带有__init__.py 的文件夹）并且它会干扰结构？

【讨论】：

我做了scp hostname:/remote/path/to/app/migrations /local/path/to/app/migrations/。然后我在添加了一些迁移之后又做了一次，只不过这次因为migrations文件夹存在，scp把第二个副本放在里面。

【解决方案2】：

在我的情况下，AttributeError: 'module' object has no attribute 'Migration' 错误只是我的迁移文件夹中有一个额外的 .py 文件。

我的迁移目录中有一个额外的实用程序模块，导致 South 阻塞。将模块移动到不同的目录（在我的应用程序迁移目录之上）解决了我的问题。

【讨论】：

randlet，是的，你是对的，迁移文件夹中有额外的 .py 文件，我删除了它们，现在它可以正常工作了。
就我而言，我刚刚删除的迁移文件夹中有一个 init.py 文件

【解决方案3】：

哇。我收到 AttributeError: 'module' object has no attribute 'Migration' 错误，原因与上述答案完全不同。

我有一个缩进错误的迁移文件：

class Migration(SchemaMigration):
    def forwards(self, orm):
        # 

    def backwards(self, orm):
        # 
        models = {...}

相对于 ...

class Migration(SchemaMigration):
    def forwards(self, orm):
        # 

    def backwards(self, orm):
        # 

    models = {...}

我不知道为什么会出现这种情况，但是当我修复时错误消失了。

【讨论】：