Django: AppRegistryNotReady()

Question

Python: 2.7; Django: 1.7; Mac 10.9.4

I'm following the tutorial of Tango with Django

At Chapter 5, the tutorial teaches how to create a population script, which can automatically create some data for the database for the ease of development.

I created a populate_rango.py at the same level of manage.py.

Here's the populate_rango.py:

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("Django")      add_page(         cat=django_cat,         title="Official Django Tutorial",         url="https://docs.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="http://www.tangowithdjango.com/"     )      frame_cat = add_cat("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"     )      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)[0]     return c  if __name__ == '__main__':     print "Starting Rango population script..."     os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'tangle.settings')     from rango.models import Category, Page     populate() 

Then I run python populate_rango.py at the terminal at the level of manage.py, AppRegistryNotReady() is raised:

django.core.exceptions.AppRegistryNotReady 

Then I googled it, found something like this:

Standalone scripts¶ If you’re using Django in a plain Python script — rather than a management command — and you rely on the DJANGO_SETTINGS_MODULE environment variable, you must now explicitly initialize Django at the beginning of your script with:  >>> import django >>> django.setup() Otherwise, you will hit an AppRegistryNotReady exception. 

And I still have no idea what should I do, can some one help? Thx!!!

Answer 1

If you are using your django project applications in standalone scripts, in other words, without using manage.py - you need to manually call django.setup() first - it would configure the logging and, what is important - populate apps registry.

Quote from Initialization process docs:

setup()

This function is called automatically:

• When running an HTTP server via Django’s WSGI support.

• When invoking a management command.

It must be called explicitly in other cases, for instance in plain Python scripts.

In your case, you need to call setup() manually:

if __name__ == '__main__':     print "Starting Rango population script..."     os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'tangle.settings')      import django     django.setup()      populate() 

Also, this problem is described in detail in Troubleshooting section.