我在Django中修改了一个应用的名字,重命名了它的文件夹、导入和所有引用(模板/索引)。但是现在,当我试图运行python manage.py runserver时,我得到了这个错误
Error: Could not import settings 'nameofmynewapp.settings' (Is it on sys.path?): No module named settings
如何调试和解决此错误?有线索吗?
我在Django中修改了一个应用的名字,重命名了它的文件夹、导入和所有引用(模板/索引)。但是现在,当我试图运行python manage.py runserver时,我得到了这个错误
Error: Could not import settings 'nameofmynewapp.settings' (Is it on sys.path?): No module named settings
如何调试和解决此错误?有线索吗?
当前回答
为什么不直接使用“查找和替换”选项呢?(每个代码编辑器都有)?
例如Visual Studio Code(在Edit选项下):
您只需输入旧名称和新名称,并替换项目中的所有内容,只需单击一下。
注意:这只重命名文件内容,而不是文件和文件夹名称。不要忘记重命名文件夹,例如。Templates /my_app_name/重命名为Templates /my_app_new_name/
其他回答
按照以下步骤在Django中更改应用程序的名称:
Rename the folder which is in your project root Change any references to your app in their dependencies, i.e. the app's views.py, urls.py , manage.py , and settings.py files. Edit the database table django_content_type with the following command: UPDATE django_content_type SET app_label='<NewAppName>' WHERE app_label='<OldAppName>' Also, if you have models, you will have to rename the model tables. For postgres, use ALTER TABLE <oldAppName>_modelName RENAME TO <newAppName>_modelName. For mysql too, I think it is the same (as mentioned by @null_radix). (For Django >= 1.7) Update the django_migrations table to avoid having your previous migrations re-run: UPDATE django_migrations SET app='<NewAppName>' WHERE app='<OldAppName>'. Note: there is some debate (in comments) if this step is required for Django 1.8+; If someone knows for sure please update here. If your models.py 's Meta Class has app_name listed, make sure to rename that too (mentioned by @will). If you've namespaced your static or templates folders inside your app, you'll also need to rename those. For example, rename old_app/static/old_app to new_app/static/new_app. For renaming django models, you'll need to change django_content_type.name entry in DB. For postgreSQL, use UPDATE django_content_type SET name='<newModelName>' where name='<oldModelName>' AND app_label='<OldAppName>' Update 16Jul2021: Also, the __pycache__/ folder inside the app must be removed, otherwise you get EOFError: marshal data too short when trying to run the server. Mentioned by @Serhii Kushchenko
元点(如果使用virtualenv):值得注意的是,如果您重命名包含virtualenv的目录,那么env中可能会有几个包含绝对路径的文件,也需要更新。如果你得到类似ImportError: No module named…这可能就是罪魁祸首。(感谢@danyamachine提供这篇文章)。
其他参考资料:你可能也想参考下面的链接,以获得更完整的图片:
用Django和South重命名应用 我如何将一个模型从一个django应用程序迁移到一个新的? 如何更改Django应用程序的名称? 使用Django South进行向后迁移 使用Django/South重命名模型的最简单方法? Python代码(感谢A.Raouf)来自动化上述步骤(未经测试的代码。我已经警告过你了!) Python代码(感谢rafaponieman)来自动化上述步骤(未经测试的代码。我已经警告过你了!)
Django 1.7新增了一个应用注册表,用于存储配置并提供自省功能。这个机制让你改变几个应用程序的属性。
我想说的主要观点是,重命名应用并不总是必要的:通过应用配置,可以解决冲突的应用。但如果你的应用需要友好的命名,这也是一种方法。
例如,我想把我的民意调查应用程序命名为“用户反馈”。它是这样的:
在polls目录下创建一个apps.py文件:
from django.apps import AppConfig
class PollsConfig(AppConfig):
name = 'polls'
verbose_name = "Feedback from users"
在polls/__init__.py中添加默认应用配置:
default_app_config = 'polls.apps.PollsConfig'
更多应用配置请访问:https://docs.djangoproject.com/en/1.7/ref/applications/
如果你正在使用PyCharm并且项目在重命名后停止工作:
编辑运行/调试配置并更改环境变量DJANGO_SETTINGS_MODULE,因为它包含了您的项目名称。 进入Settings / Languages & Frameworks / Django,更新Settings文件的位置。
重新迁移,寻找更干净的板块。
这可以毫不痛苦地做,如果其他应用程序没有外键模型从应用程序被重命名。检查并确保他们的迁移文件没有列出任何来自此迁移的迁移。
Backup your database. Dump all tables with a) data + schema for possible circular dependencies, and b) just data for reloading. Run your tests. Check all code into VCS. Delete the database tables of the app to be renamed. Delete the permissions: delete from auth_permission where content_type_id in (select id from django_content_type where app_label = '<OldAppName>') Delete content types: delete from django_content_type where app_label = '<OldAppName>' Rename the folder of the app. Change any references to your app in their dependencies, i.e. the app's views.py, urls.py , 'manage.py' , and settings.py files. Delete migrations: delete from django_migrations where app = '<OldAppName>' If your models.py 's Meta Class has app_name listed, make sure to rename that too (mentioned by @will). If you've namespaced your static or templates folders inside your app, you'll also need to rename those. For example, rename old_app/static/old_app to new_app/static/new_app. If you defined app config in apps.py; rename those, and rename their references in settings.INSTALLED_APPS Delete migration files. Re-make migrations, and migrate. Load your table data from backups.
有趣的问题!我很快就要给很多应用重命名了,所以我先做了个预演。
这种方法允许在原子步骤中取得进展,以最大限度地减少对正在重命名应用程序的其他开发人员的干扰。
请参阅答案底部的链接,以获得工作示例代码。
Prepare existing code for the move: Create an app config (set name and label to defaults). Add the app config to INSTALLED_APPS. On all models, explicitly set db_table to the current value. Doctor migrations so that db_table was "always" explicitly defined. Ensure no migrations are required (checks previous step). Change the app label: Set label in app config to new app name. Update migrations and foreign keys to reference new app label. Update templates for generic class-based views (the default path is <app_label>/<model_name>_<suffix>.html) Run raw SQL to fix migrations and content_types app (unfortunately, some raw SQL is unavoidable). You can not run this in a migration. UPDATE django_migrations SET app = 'catalogue' WHERE app = 'shop'; UPDATE django_content_type SET app_label = 'catalogue' WHERE app_label = 'shop'; Ensure no migrations are required (checks previous step). Rename the tables: Remove "custom" db_table. Run makemigrations so django can rename the table "to the default". Move the files: Rename module directory. Fix imports. Update app config's name. Update where INSTALLED_APPS references the app config. Tidy up: Remove custom app config if it's no longer required. If app config gone, don't forget to also remove it from INSTALLED_APPS.
示例解决方案:我已经创建了app-rename- Example,一个示例项目,在这里你可以看到我如何重命名一个应用程序,一次提交一次。
这个例子使用的是Python 2.7和Django 1.8,但我相信同样的过程至少可以在Python 3.6和Django 2.1上工作。