如警告中所述，将发生以下两种情况：
通常，当你有from .models import SomeModels一个apps.py早期信号时（例如post_migrate），就会发生这种情况。建议不要使用AppConfig.get_model（）代替这里的经典方法。检查你的apps.py文件是否有任何模型导入，并使用此api替换它们。
例如代替：
# apps.py
from django.apps import AppConfig
from .models import MyModel
def do_stuff(sender, **kwargs):
MyModel.objects.get() # etc...
class MyAppConfig(AppConfig):
name = 'src.my_app_label'
def ready(self):
post_migrate.connect(do_stuff, sender=self)
做这个 ：
# apps.py
from django.apps import AppConfig
def do_stuff(sender, **kwargs):
mymodel = sender.get_model('MyModel')
mymodel.objects.get() # etc...
class MyAppConfig(AppConfig):
name = 'src.my_app_label'
def ready(self):
post_migrate.connect(do_stuff, sender=self)
请注意，此强制性是在Bug ＃21719中引入的。
RemovedInDjango19Warning: Model class django.contrib.sites.models.Site doesn't declare an explicit app_label and either isn't in an application in INSTALLED_APPS or else was imported before its application was loaded. This will no longer be supported in Django 1.9.
class Site(models.Model):
我的解决方案是：
添加'django.contrib.sites'到INSTALLED_APPS
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