创建新内容类型时出错。请确保在尝试单独迁移应用程序之前迁移内容类型

Question

我正在尝试从 Django 1.6 迁移到 Django 1.8。我在 Django 1.6 中使用South 管理migrations。我已经通过python manage.py makemigrations 成功创建了新的迁移文件。在运行python manage.py migrate --fake-initial 时，出现此错误

 Traceback (most recent call last):
  File "manage.py", line 39, in <module>
    execute_from_command_line(sys.argv)
  File "/home/jonty/.virtualenvs/squadrun/local/lib/python2.7/site-    packages/django/core/management/__init__.py", line 338, in   execute_from_command_line
    utility.execute()
  File "/home/jonty/.virtualenvs/squadrun/local/lib/python2.7/site-  packages/django/core/management/__init__.py", line 330, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/jonty/.virtualenvs/squadrun/local/lib/python2.7/site-packages/django/core/management/base.py", line 390, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/home/jonty/.virtualenvs/squadrun/local/lib/python2.7/site-packages/django/core/management/base.py", line 441, in execute
    output = self.handle(*args, **options)
  File "/home/jonty/.virtualenvs/squadrun/local/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 225, in handle
    emit_post_migrate_signal(created_models, self.verbosity, self.interactive, connection.alias)
  File "/home/jonty/.virtualenvs/squadrun/local/lib/python2.7/site-packages/django/core/management/sql.py", line 280, in emit_post_migrate_signal
using=db)
  File "/home/jonty/.virtualenvs/squadrun/local/lib/python2.7/site-packages/django/dispatch/dispatcher.py", line 201, in send
response = receiver(signal=self, sender=sender, **named)
  File "/home/jonty/.virtualenvs/squadrun/local/lib/python2.7/site-packages/django/contrib/auth/management/__init__.py", line 82, in create_permissions
    ctype = ContentType.objects.db_manager(using).get_for_model(klass)
  File "/home/jonty/.virtualenvs/squadrun/local/lib/python2.7/site-packages/django/contrib/contenttypes/models.py", line 78, in get_for_model
    "Error creating new content types. Please make sure contenttypes "

其中一个迁移文件0001_initial.py 说：

dependencies = [
    ('auth', '0006_require_contenttypes_0002'),
    ('clients', '0002_auto_20150428_1551'),
    ('players', '0001_initial'),
]

我猜这尤其是问题所在。有什么办法可以解决这个问题。任何帮助将不胜感激。

Answer 1

根据this，我认为这与“删除ContentType.name”有关。但不知何故，它不起作用。

通过手动从“django_content_type”表中删除列name。例如。

'ALTER TABLE django_content_type DROP COLUMN name'

我能够应用迁移。也许这至少能让你走得更远。

Answer 2

尝试先迁移身份验证应用程序，然后再迁移其他应用程序：

manage.py migrate auth
manage.py migrate <app_name>

Answer 3

就我而言，我解决这个问题的方法是更新到更新版本的 django。 如果您使用 mac，请执行以下操作：

1. pip install django --upgrade
2. python manage.py makemigrations
3. python manage.py 迁移

Answer 4

可能看起来很奇怪，但我通过升级到 Django 1.8 版解决了这个问题。 最初我使用的是 1.7 版

Answer 5

添加到@int_ua 的评论 将此作为依赖项添加到失败的迁移中：

dependencies = [
    ('contenttypes', '0002_remove_content_type_name'),
]

然后再次运行迁移。

Answer 6

我不得不在 Django 1.9.1 中合并两个系统，但我无法克服这个错误：

 "Error creating new content types. Please make sure contenttypes "

广泛的谷歌搜索和堆栈溢出没有结果。最后，我将调试行添加到

~/.virtualenvs/(venv_name)/lib/python2.7/site-packages/django/contrib/contenttypes/models.py

 except (OperationalError, ProgrammingError, IntegrityError):
        # It's possible to migrate a single app before contenttypes,
        # as it's not a required initial dependency (it's contrib!)
        # Have a nice error for this.
        print "\n\nError for Content type model "+opts.model_name+"\n\n"
        raise RuntimeError(
            "Error creating new content types. Please make sure contenttypes "
            "is migrated before trying to migrate apps individually."
        )

这告诉了我导致错误并最终导致修复的型号名称。

我正在使用 Postgres，表 django_content_type 和 auth_permission 的序列号没有指向表的末尾，导致插入失败。

这两行修复了（基于此SO post）

SELECT pg_catalog.setval(pg_get_serial_sequence('django_content_type', 'id'), (SELECT MAX(id) FROM django_content_type)+1);
SELECT pg_catalog.setval(pg_get_serial_sequence('auth_permission', 'id'), (SELECT MAX(id) FROM auth_permission)+1);