1. 程式人生 > >Django2.1遇到 app_label and isn't in an application in INSTALLED_APPS 錯誤

Django2.1遇到 app_label and isn't in an application in INSTALLED_APPS 錯誤

Django在應用列表中新增新的應用時有時會出錯

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'django.contrib.sites',
    'news_web',
    'DjangoUeditor',
    'mdeditor'
, 'django_markdown', 'markdownx', #'fluent_contents', ]

啟動專案時報錯為

Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0x7efe941f08c8>
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/Django-2.1-py3.6.egg/django/utils/autoreload.py"
, line 225, in wrapper fn(*args, **kwargs) File "/usr/local/lib/python3.6/site-packages/Django-2.1-py3.6.egg/django/core/management/commands/runserver.py", line 111, in inner_run autoreload.raise_last_exception() File "/usr/local/lib/python3.6/site-packages/Django-2.1-py3.6.egg/django/utils/autoreload.py", line
248, in raise_last_exception raise _exception[1] File "/usr/local/lib/python3.6/site-packages/Django-2.1-py3.6.egg/django/core/management/__init__.py", line 329, in execute autoreload.check_errors(django.setup)() File "/usr/local/lib/python3.6/site-packages/Django-2.1-py3.6.egg/django/utils/autoreload.py", line 225, in wrapper fn(*args, **kwargs) File "/usr/local/lib/python3.6/site-packages/Django-2.1-py3.6.egg/django/__init__.py", line 24, in setup apps.populate(settings.INSTALLED_APPS) File "/usr/local/lib/python3.6/site-packages/Django-2.1-py3.6.egg/django/apps/registry.py", line 120, in populate app_config.ready() File "/usr/local/lib/python3.6/site-packages/Django-2.1-py3.6.egg/django/contrib/admin/apps.py", line 23, in ready self.module.autodiscover() File "/usr/local/lib/python3.6/site-packages/Django-2.1-py3.6.egg/django/contrib/admin/__init__.py", line 26, in autodiscover autodiscover_modules('admin', register_to=site) File "/usr/local/lib/python3.6/site-packages/Django-2.1-py3.6.egg/django/utils/module_loading.py", line 47, in autodiscover_modules import_module('%s.%s' % (app_config.name, module_to_search)) File "/usr/local/lib/python3.6/importlib/__init__.py", line 126, in import_module return _bootstrap._gcd_import(name[level:], package, level) File "<frozen importlib._bootstrap>", line 994, in _gcd_import File "<frozen importlib._bootstrap>", line 971, in _find_and_load File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 665, in _load_unlocked File "<frozen importlib._bootstrap_external>", line 678, in exec_module File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed File "/opt/py/super/news_web/admin.py", line 7, in <module> from fluent_contents.admin import PlaceholderFieldAdmin File "/usr/local/lib/python3.6/site-packages/fluent_contents/admin/__init__.py", line 14, in <module> from fluent_contents.admin.placeholdereditor import PlaceholderEditorAdmin, PlaceholderEditorInline, PlaceholderEditorBaseMixin File "/usr/local/lib/python3.6/site-packages/fluent_contents/admin/placeholdereditor.py", line 14, in <module> from fluent_contents import extensions File "/usr/local/lib/python3.6/site-packages/fluent_contents/extensions/__init__.py", line 12, in <module> from .pluginbase import PluginContext, ContentPlugin, HttpRedirectRequest File "/usr/local/lib/python3.6/site-packages/fluent_contents/extensions/pluginbase.py", line 13, in <module> from django.contrib.sites.models import Site File "/usr/local/lib/python3.6/site-packages/Django-2.1-py3.6.egg/django/contrib/sites/models.py", line 80, in <module> class Site(models.Model): File "/usr/local/lib/python3.6/site-packages/Django-2.1-py3.6.egg/django/db/models/base.py", line 99, in __new__ "INSTALLED_APPS." % (module, name) RuntimeError: Model class django.contrib.sites.models.Site doesn't declare an explicit app_label and isn't in an application in INSTALLED_APPS.

將不用的app註釋掉也沒有起到作用,上網查解決方案。找了半天在Stack Overflow上找找到一篇答案,解決方法如下:
在setting中增加

INSTALLED_APPS = [
    ...
    'django.contrib.sites',
]

SITE_ID = 1