Django：从INSTALLED_APPS中删除django.contrib.sites时出错

我想从我的django项目中删除django.contrib.sites 。

当我尝试删除我在启动服务器时遇到以下错误：

 /usr/local/lib/python3.5/site-packages/django/db/models/fields/subclassing.py:22: RemovedInDjango110Warning: SubfieldBase has been deprecated. Use Field.from_db_value instead. web_1 | RemovedInDjango110Warning) web_1 | web_1 | /usr/local/lib/python3.5/site-packages/django/db/models/fields/subclassing.py:22: RemovedInDjango110Warning: SubfieldBase has been deprecated. Use Field.from_db_value instead. web_1 | RemovedInDjango110Warning) web_1 | web_1 | Performing system checks... web_1 | web_1 | System check identified no issues (0 silenced). web_1 | Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0x7f154e979048> web_1 | Traceback (most recent call last): web_1 | File "/usr/local/lib/python3.5/site-packages/django/utils/autoreload.py", line 226, in wrapper web_1 | fn(*args, **kwargs) web_1 | File "/usr/local/lib/python3.5/site-packages/django/core/management/commands/runserver.py", line 117, in inner_run web_1 | self.check_migrations() web_1 | File "/usr/local/lib/python3.5/site-packages/django/core/management/commands/runserver.py", line 163, in check_migrations web_1 | executor = MigrationExecutor(connections[DEFAULT_DB_ALIAS]) web_1 | File "/usr/local/lib/python3.5/site-packages/django/db/migrations/executor.py", line 20, in __init__ web_1 | self.loader = MigrationLoader(self.connection) web_1 | File "/usr/local/lib/python3.5/site-packages/django/db/migrations/loader.py", line 49, in __init__ web_1 | self.build_graph() web_1 | File "/usr/local/lib/python3.5/site-packages/django/db/migrations/loader.py", line 306, in build_graph web_1 | _reraise_missing_dependency(migration, parent, e) web_1 | File "/usr/local/lib/python3.5/site-packages/django/db/migrations/loader.py", line 276, in _reraise_missing_dependency web_1 | raise exc web_1 | File "/usr/local/lib/python3.5/site-packages/django/db/migrations/loader.py", line 302, in build_graph web_1 | self.graph.add_dependency(migration, key, parent) web_1 | File "/usr/local/lib/python3.5/site-packages/django/db/migrations/graph.py", line 126, in add_dependency web_1 | parent web_1 | django.db.migrations.exceptions.NodeNotFoundError: Migration services.0001_initial dependencies reference nonexistent parent node ('sites', '0002_alter_domain_unique') 

只有我在我的项目中所做的修改是在settings.py添加了以下信息：

 SITE_ID = 1 INSTALLED_APPS = [ 'django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.messages', 'django.contrib.staticfiles', 'django.contrib.sites' ] 

在执行以下命令后，在pipe理页面中查看结果：

 python manage.py makemigrations python manage.py migrate 

现在，当我从设置中删除configuration并运行makemigrations和migrate命令时，出现上述错误。

我正在使用python:3.5和Django:1.9来使用docker 。

Answer 1

似乎是由我自己解决。 以下我已经做了解决它的事情：

1. 从settings.py删除以下内容

   SITE_ID = 1

和INSTALLED_APPS块中的'django.contrib.sites'

 INSTALLED_APPS = [ 'django.contrib.sites' ] 

2. 从应用程序中的migrations文件夹中删除了自动生成的文件（我已经在其中导入了django.contrib.sites Models 的应用程序）。

3. 重新运行makemigrations和migrate命令。

4. 一切工作正常。

谢谢。