“模型尚未加载”在填入Django 1.8和Python 2.7.8时出错 [英] "Models aren't loaded yet" error while populating in Django 1.8 and Python 2.7.8

问题描述

我正在使用此代码来填充我的数据库：

I am using this code to populate my database:

import os
def populate():
python_cat = add_cat('Python')

add_page(cat=python_cat, 
title="Official Python Tutorial",
url="http://docs.python.org/2/tutorial/")

add_page(cat=python_cat,
title="How to Think like a Computer Scientist",
url="http://www.greenteapress.com/thinkpython/")

add_page(cat=python_cat,
title="Learn Python in 10 minutes",
url="http://www.korokithakis.net/tutorials/python/")

django_cat = add_cat(name="Django")

add_page(cat=django_cat,
title="Official Django Tutorial",
url="http://djangoproject.com/en/1.5/intro/tutorial01/")

add_page(cat=django_cat,
title="Django Rocks",
url="http://www.djangorocks.com/")

add_page(cat=django_cat,
title="How to Tango with Django",
url="htttp://www.tangowithdjango.com/")

frame_cat = add_cat(name="Other Frameworks")

add_page(cat=frame_cat, 
title="Bottle",
url="http://bottlepy.org/docs/dev/")

add_page(cat=frame_cat, 
title="Flask",
url="http://flask.pocoo.org")

# Print out what we have added to the user. 
for c in Category.objects.all():
    for p in Page.objects.filter(category=c):
        print "- {0} - {1}".format(str(c), str(p))

def add_page(cat, title, url, views=0):
p = Page.objects.get_or_create(category=cat, title=title, url=url, views=views)[0]
return p

def add_cat(name):
c = Category.objects.get_or_create(name=name)
return c

if __name__ == '__main__':
print "Starting Rango population script..."
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'p.settings')
from rango.models import Category, Page
populate()

正在运行

python c:\python27\p\populate_rango.py

它给出错误：

Staring Rango population script...
Traceback (most recent call last):
File "c:\python27\p\populate_rango.py", line 59, in <module>
populate()
File "c:\python27\p\populate_rango.py", line 4, in populate
python_cat = add_cat('Python')
File "c:\python27\p\populate_rango.py", line 52, in add_cat
c = Category.objects.get_or_create(name=name)
File "C:\Python27\Lib\site-packages\django\db\models\manager.py", li
manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "C:\Python27\Lib\site-packages\django\db\models\query.py", line
et_or_create
return self.get(**lookup), False
File "C:\Python27\Lib\site-packages\django\db\models\query.py", line
clone = self.filter(*args, **kwargs)
File "C:\Python27\Lib\site-packages\django\db\models\query.py", line
ilter
return self._filter_or_exclude(False, *args, **kwargs)
File "C:\Python27\Lib\site-packages\django\db\models\query.py", line
filter_or_exclude
clone.query.add_q(Q(*args, **kwargs))
File "C:\Python27\Lib\site-packages\django\db\models\sql\query.py",
in add_q
clause, require_inner = self._add_q(where_part, self.used_aliases)
File "C:\Python27\Lib\site-packages\django\db\models\sql\query.py",
in _add_q
current_negated=current_negated, connector=connector)
File "C:\Python27\Lib\site-packages\django\db\models\sql\query.py",
in build_filter
lookups, parts, reffed_aggregate = self.solve_lookup_type(arg)
File "C:\Python27\Lib\site-packages\django\db\models\sql\query.py",
in solve_lookup_type
_, field, _, lookup_parts = self.names_to_path(lookup_splitted, se
a())
File "C:\Python27\Lib\site-packages\django\db\models\sql\query.py",
in names_to_path
field, model, direct, m2m = opts.get_field_by_name(name)
File "C:\Python27\Lib\site-packages\django\db\models\options.py", li
get_field_by_name
cache = self.init_name_map()
File "C:\Python27\Lib\site-packages\django\db\models\options.py", li
init_name_map
for f, model in self.get_all_related_m2m_objects_with_model():
File "C:\Python27\Lib\site-packages\django\db\models\options.py", li
get_all_related_m2m_objects_with_model
cache = self._fill_related_many_to_many_cache()
File "C:\Python27\Lib\site-packages\django\db\models\options.py", li
_fill_related_many_to_many_cache
for klass in self.apps.get_models():
File "C:\Python27\Lib\site-packages\django\utils\lru_cache.py", line
rapper
result = user_function(*args, **kwds)
File "C:\Python27\Lib\site-packages\django\apps\registry.py", line 1
_models
*self.check_models_ready()
File "C:\Python27\Lib\site-packages\django\apps\registry.py", line 1
ck_models_ready
raise AppRegistryNotReady("Models aren't loaded yet.")
django.core.exceptions.AppRegistryNotReady: Models aren't loaded yet.*

我的其他文件都可以，但是收到这个错误。我正在跟随Django 的探戈教程，但是正如本书所指的是Django 1.5.4，而我正在使用Django 1.8，任何人都可以帮助我吗？

Rest of my files are ok but getting this error. I am following the tutorial from Tango with Django book but as the book refers to Django 1.5.4 and i am using Django 1.8, so can anyone help me here?

推荐答案

我与Django 1.7rc2有异常。解决方案是在我的程序开始时添加这些行：

I had the same exception with Django 1.7rc2. The solution was to add these lines at the beginning of my program:

import django
django.setup()

更新：现在已经记录了Django 1.8。

这篇关于“模型尚未加载”在填入Django 1.8和Python 2.7.8时出错的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！