我正在尝试将django-south 迁移到现有应用程序以向其添加django-audit-log(以跟踪用户启动的模块更改),但遇到了重大错误。特别是作为 LastUserField 的 action_user_id 字段(存储指定正在跟踪的更改的用户)。
如果我从一个空白模型开始,我可以通过以下方式添加一个 audit_log:
from audit_log.models.managers import AuditLog
...
class SomeModel(models.Model)
...
audit_log = AuditLog()
应用这个简单的更改并在 django-south 中进行模式迁移会理解地给我一个错误:
! Cannot freeze field 'myapp.mymodelauditlogentry.action_user'
! (this field has class audit_log.models.fields.LastUserField)
! South cannot introspect some fields; this is probably because they are custom
! fields. If they worked in 0.6 or below, this is because we have removed the
! models parser (it often broke things).
! To fix this, read http://south.aeracode.org/wiki/MyFieldsDontWork
我阅读了 MyFieldsDontWork wiki(以及自定义字段/自省部分),但它并不是 100% 清楚我需要做什么才能使这些字段正常工作。
我尝试添加:
from south.modelsinspector import add_introspection_rules
add_introspection_rules([], ["^audit_log\.models\.fields\.LastUserField"])
到我的models.py,它允许./manage.py schemamigration 创建一个迁移脚本,之前的错误消失了。但是,当我尝试迁移(应用迁移)时,出现以下错误:
Running migrations for myapp:
- Migrating forwards to 0004_auto__add_mymodelauditlogentry.
> my_app:0004_auto__add_mymodelauditlogentry
Traceback (most recent call last):
File "./manage.py", line 11, in <module>
execute_manager(settings)
File "/usr/local/lib/python2.6/dist-packages/Django-1.2.3-py2.6.egg/django/core/management/__init__.py", line 438, in execute_manager
utility.execute()
File "/usr/local/lib/python2.6/dist-packages/Django-1.2.3-py2.6.egg/django/core/management/__init__.py", line 379, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/usr/local/lib/python2.6/dist-packages/Django-1.2.3-py2.6.egg/django/core/management/base.py", line 191, in run_from_argv
self.execute(*args, **options.__dict__)
File "/usr/local/lib/python2.6/dist-packages/Django-1.2.3-py2.6.egg/django/core/management/base.py", line 220, in execute
output = self.handle(*args, **options)
File "/usr/local/lib/python2.6/dist-packages/South-0.7.3-py2.6.egg/south/management/commands/migrate.py", line 105, in handle
ignore_ghosts = ignore_ghosts,
File "/usr/local/lib/python2.6/dist-packages/South-0.7.3-py2.6.egg/south/migration/__init__.py", line 191, in migrate_app
success = migrator.migrate_many(target, workplan, database)
File "/usr/local/lib/python2.6/dist-packages/South-0.7.3-py2.6.egg/south/migration/migrators.py", line 221, in migrate_many
result = migrator.__class__.migrate_many(migrator, target, migrations, database)
File "/usr/local/lib/python2.6/dist-packages/South-0.7.3-py2.6.egg/south/migration/migrators.py", line 292, in migrate_many
result = self.migrate(migration, database)
File "/usr/local/lib/python2.6/dist-packages/South-0.7.3-py2.6.egg/south/migration/migrators.py", line 125, in migrate
result = self.run(migration)
File "/usr/local/lib/python2.6/dist-packages/South-0.7.3-py2.6.egg/south/migration/migrators.py", line 93, in run
south.db.db.current_orm = self.orm(migration)
File "/usr/local/lib/python2.6/dist-packages/South-0.7.3-py2.6.egg/south/migration/migrators.py", line 246, in orm
return migration.orm()
File "/usr/local/lib/python2.6/dist-packages/South-0.7.3-py2.6.egg/south/utils.py", line 62, in method
value = function(self)
File "/usr/local/lib/python2.6/dist-packages/South-0.7.3-py2.6.egg/south/migration/base.py", line 422, in orm
return FakeORM(self.migration_class(), self.app_label())
File "/usr/local/lib/python2.6/dist-packages/South-0.7.3-py2.6.egg/south/orm.py", line 46, in FakeORM
_orm_cache[args] = _FakeORM(*args)
File "/usr/local/lib/python2.6/dist-packages/South-0.7.3-py2.6.egg/south/orm.py", line 125, in __init__
self.models[name] = self.make_model(app_label, model_name, data)
File "/usr/local/lib/python2.6/dist-packages/South-0.7.3-py2.6.egg/south/orm.py", line 318, in make_model
field = self.eval_in_context(code, app, extra_imports)
File "/usr/local/lib/python2.6/dist-packages/South-0.7.3-py2.6.egg/south/orm.py", line 236, in eval_in_context
return eval(code, globals(), fake_locals)
File "<string>", line 1, in <module>
File "/usr/local/lib/python2.6/dist-packages/django_audit_log-0.2.1-py2.6.egg/audit_log/models/fields.py", line 12, in __init__
super(LastUserField, self).__init__(User, null = True, **kwargs)
TypeError: __init__() got multiple values for keyword argument 'null'
编辑(中午 12 月 20 日):如果我将行添加到 models.py,我可以应用架构迁移
from south.modelsinspector import add_introspection_rules, add_ignored_fields
add_ignored_fields(["^audit_log\.models\.fields\.LastUserField"])
除此之外,audit_log 中间件不起作用,因为 myapp_mymodelauditlogentry 中没有 action_user_id 整数字段通过“id”引用“auth_user”。然后我手动应用 SQL(sqlite 语法;通过在新创建的数据库上使用 sqliteman 获得。)
ALTER TABLE "myapp_mymodelauditlogentry" ADD "action_user_id" integer REFERENCES "auth_user" ("id");
它有效。如果有人用迁移/内省解释我应该如何在 django-south 的上下文中执行此操作,我仍然会给予赏金,而无需使用原始数据库依赖 SQL 并感激不尽。
另外,我为 action_user_id 创建了一个索引。我注意到模型的正常创建会导致一个名为
CREATE INDEX "myapp_mymodelauditlogentry_26679921" ON "myapp_mymodelauditlogentry" ("action_user_id")
我发现哈希 26679921 是基于字段名称创建的,'%x' % (abs(hash(('action_user_id',))) % 4294967296L,)
而不是基于其他任何内容(因此应该始终是 _26679921,除非数据库需要截断长名称)。我不确定索引的名称是否重要;但想要安全。