我已經看到了一些關於此的帖子,但目前爲止沒有人幫助我。我有一個工作的Django應用程序,我想從sqlite到postgresql數據庫。爲此,我遵循djangogirls教程,這很棒,直到發生一些錯誤。django sqlite到postgresql遷移時的ProgrammingError
我已經在我的pc上下載了postgresql進行開發,然後我下載並安裝了psycopg2,它工作正常,我更改了我的settings.py數據庫配置,並且我正好在我想遷移到postgres的地方。
他們在本教程中說的是運行「python manage.py migrate」,這對我不起作用,可能是因爲他們認爲它是一個空白的應用程序或其他東西,而且我已經有了與之相關的遷移和模型。
,我讀了運行
python manage.py makemigrations
python manage.py migrate
會做的伎倆,但我和我的自定義模型的問題。然後我讀,我可以發表評論指出,用這個問題模型的所有代碼,然後運行
python manage.py makemigrations
python manage.py migrate --fake
取消註釋,並運行
python manage.py migrate
這一點我試過了,但現在我得到了同樣的錯誤作爲我的自定義模型,但對於contenttypes應用程序。
回溯是這樣的:
( 「拉關係 'django_content_type' n'existe PAS」= 「關係 '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.
我的遷移是這樣的:
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
我不知道如何解決這個問題,因爲我嘗試了很多東西。數據庫和部署不是我的優點。有人可以幫我解決這個問題嗎?
編輯 我想我所有的變化恢復到我的申請工作,並通過刪除我的源碼文件和我所有的移民開始在部分,我刪除了所有我的pyc(蟒蛇緩存)文件,註釋掉所有代碼與Ecole模型相關,然後再遷移,並且我仍然得到相同的錯誤:(
你想保留你的數據從sqlite? 「python manage.py migrate contenttypes」是做什麼的? –
我不介意從sqlite中丟失我的數據,並且該命令會輸出與上述相同的錯誤:/ –
您可以編輯問題,而不是在答案中添加新的信息。 – marcanuy