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我已经看到了一些关于此的帖子，但目前为止没有人帮助我。我有一个工作的Django应用程序，我想从sqlite到postgresql数据库。为此，我遵循djangogirls教程，这很棒，直到发生一些错误。django sqlite到postgresql迁移时的ProgrammingError
我已经在我的pc上下载了postgresql进行开发，然后我下载并安装了psycopg2，它工作正常，我更改了我的settings.py数据库配置，并且我正好在我想迁移到postgres的地方。
他们在本教程中说的是运行“python manage.py migrate”，这对我不起作用，可能是因为他们认为它是一个空白的应用程序或其他东西，而且我已经有了与之相关的迁移和模型。
，我读了运行
python manage.py makemigrations
python manage.py migrate
会做的伎俩，但我和我的自定义模型的问题。然后我读，我可以发表评论指出，用这个问题模型的所有代码，然后运行
python manage.py makemigrations
python manage.py migrate --fake
取消注释，并运行
python manage.py migrate
这一点我试过了，但现在我得到了同样的错误作为我的自定义模型，但对于contenttypes应用程序。
回溯是这样的：
（ “拉关系 'django_content_type' n'existe PAS”= “关系 'django_content_type' 不存在”）
Operations to perform:
Apply all migrations: auth, contenttypes, sessions, admin
Running migrations:
No migrations to apply.
Traceback (most recent call last):
File "C:\Users\gbastien1\Envs\django-carte\lib\site-packages\django\db\backends\utils.py", line 64, in execute
return self.cursor.execute(sql, params)
psycopg2.ProgrammingError: ERREUR: la relation « django_content_type » n'existe pas
LINE 1: ..."."app_label", "django_content_type"."model" FROM "django_co...
^
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "C:\Users\gbastien1\Envs\django-carte\lib\site-packages\django\contrib\contenttypes\models.py", line 67, in get_for_model
ct = self.get(app_label=opts.app_label, model=opts.model_name)
File "C:\Users\gbastien1\Envs\django-carte\lib\site-packages\django\db\models\manager.py", line 122, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "C:\Users\gbastien1\Envs\django-carte\lib\site-packages\django\db\models\query.py", line 381, in get
num = len(clone)
File "C:\Users\gbastien1\Envs\django-carte\lib\site-packages\django\db\models\query.py", line 240, in __len__
self._fetch_all()
File "C:\Users\gbastien1\Envs\django-carte\lib\site-packages\django\db\models\query.py", line 1074, in _fetch_all
self._result_cache = list(self.iterator())
File "C:\Users\gbastien1\Envs\django-carte\lib\site-packages\django\db\models\query.py", line 52, in __iter__
results = compiler.execute_sql()
File "C:\Users\gbastien1\Envs\django-carte\lib\site-packages\django\db\models\sql\compiler.py", line 848, in execute_sql
cursor.execute(sql, params)
File "C:\Users\gbastien1\Envs\django-carte\lib\site-packages\django\db\backends\utils.py", line 79, in execute
return super(CursorDebugWrapper, self).execute(sql, params)
File "C:\Users\gbastien1\Envs\django-carte\lib\site-packages\django\db\backends\utils.py", line 64, in execute
return self.cursor.execute(sql, params)
File "C:\Users\gbastien1\Envs\django-carte\lib\site-packages\django\db\utils.py", line 95, in __exit__
six.reraise(dj_exc_type, dj_exc_value, traceback)
File "C:\Users\gbastien1\Envs\django-carte\lib\site-packages\django\utils\six.py", line 685, in reraise
raise value.with_traceback(tb)
File "C:\Users\gbastien1\Envs\django-carte\lib\site-packages\django\db\backends\utils.py", line 64, in execute
return self.cursor.execute(sql, params)
django.db.utils.ProgrammingError: ERREUR: la relation « django_content_type » n'existe pas
LINE 1: ..."."app_label", "django_content_type"."model" FROM "django_co...
^
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "C:\Users\gbastien1\Envs\django-carte\lib\site-packages\django\core\management\__init__.py", line 353, in execute_from_command_line
utility.execute()
File "C:\Users\gbastien1\Envs\django-carte\lib\site-packages\django\core\management\__init__.py", line 345, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "C:\Users\gbastien1\Envs\django-carte\lib\site-packages\django\core\management\base.py", line 348, in run_from_argv
self.execute(*args, **cmd_options)
File "C:\Users\gbastien1\Envs\django-carte\lib\site-packages\django\core\management\base.py", line 399, in execute
output = self.handle(*args, **options)
File "C:\Users\gbastien1\Envs\django-carte\lib\site-packages\django\core\management\commands\migrate.py", line 204, in handle
emit_post_migrate_signal(self.verbosity, self.interactive, connection.alias)
File "C:\Users\gbastien1\Envs\django-carte\lib\site-packages\django\core\management\sql.py", line 50, in emit_post_migrate_signal
using=db)
File "C:\Users\gbastien1\Envs\django-carte\lib\site-packages\django\dispatch\dispatcher.py", line 192, in send
response = receiver(signal=self, sender=sender, **named)
File "C:\Users\gbastien1\Envs\django-carte\lib\site-packages\django\contrib\auth\management\__init__.py", line 85, in create_permissions
ctype = ContentType.objects.db_manager(using).get_for_model(klass)
File "C:\Users\gbastien1\Envs\django-carte\lib\site-packages\django\contrib\contenttypes\models.py", line 80, in get_for_model
"Error creating new content types. Please make sure contenttypes "
RuntimeError: Error creating new content types. Please make sure contenttypes is migrated before trying to migrate apps individually.
我的迁移是这样的：
admin
[X] 0001_initial
[X] 0002_logentry_remove_auto_add
auth
[X] 0001_initial
[X] 0002_alter_permission_name_max_length
[X] 0003_alter_user_email_max_length
[X] 0004_alter_user_username_opts
[X] 0005_alter_user_last_login_null
[X] 0006_require_contenttypes_0002
[X] 0007_alter_validators_add_error_messages
contenttypes
[X] 0001_initial
[X] 0002_remove_content_type_name
sessions
[X] 0001_initial
我不知道如何解决这个问题，因为我尝试了很多东西。数据库和部署不是我的优点。有人可以帮我解决这个问题吗？
编辑 我想我所有的变化恢复到我的申请工作，并通过删除我的源码文件和我所有的移民开始在部分，我删除了所有我的pyc（蟒蛇缓存）文件，注释掉所有代码与Ecole模型相关，然后再迁移，并且我仍然得到相同的错误：（
你想保留你的数据从sqlite？ “python manage.py migrate contenttypes”是做什么的？ –
我不介意从sqlite中丢失我的数据，并且该命令会输出与上述相同的错误：/ –
您可以编辑问题，而不是在答案中添加新的信息。 – marcanuy