Django/Python Runtime Error: Maximum recursion depth exceeded

Question

I'm trying to add a blog app to my Django project. When I put everything together, I can see my blog posts page, but something with the blogapp/urls.py file is causing me to get a maximum recursion error somewhere and I'm having a hard time finding it. First, here is the error message in full:

RuntimeError at /admin/
maximum recursion depth exceeded while calling a Python object
Request Method: GET
Request URL:    localhost/admin/  #I edited this due to a posting error
Django Version: 1.4
Exception Type: RuntimeError
Exception Value:    
maximum recursion depth exceeded while calling a Python object
Exception Location: /Users/User/tmp/newproject/DJANGO/lib/python2.7/site-packages/Django-1.4-py2.7.egg/django/utils/translation/trans_real.py in get_language, line 222
Python Executable:  /Users/User/tmp/newproject/DJANGO/bin/python
Python Version: 2.7.1

Here is the urlpatterns variable from mysite/urls.py:

urlpatterns = patterns('',
    url(r'^polls/', include('polls.urls')),
    url(r'^blogapp/', include('blogapp.urls')),
    url(r'^admin/', include(admin.site.urls)),
)

And this is my blogapp/urls.py file:

from django.conf.urls import patterns, include, url
from django.views.generic import ListView
from blogapp.models import Post
urlpatterns = patterns('',
    url(r'^', ListView.as_view(queryset=Post.objects.all().order_by("-created")[:2],
                            template_name="/Users/User/tmp/newproject/DJANGO/mysite/templates/blogapp/blog.htm    l")),     
    url(r'^blog/', include('blogapp.urls')),
)

And, for good measure, this is my blogapp/models.py file:

from django.db import models

class Post(models.Model):
    '''represents a class instance of a blog entry'''
    title = models.CharField(max_length=100)
    created = models.DateTimeField()
    body = models.TextField()

    def __unicode__(self):
        return self.title

Answer 1

You seem to be including blogapp.urls inside itself. Doesn't sound like a good idea.

Answer 2

The problem is that django logout method is in your view logout method. So it calls itself and never ends.

So you may rename your view logout method as 'signout' or something like that.

Other way is import django logout with other name like below and called it in your logout method: from django.contrib.auth import logout as core_logout

Answer 3

I got the similar error:

RecursionError: maximum recursion depth exceeded in comparison

When creating and saving Person object in save() overridden in Person class as shown below:

from django.db import models

class Person(models.Model):
    first_name = models.CharField(max_length=30)
    last_name = models.CharField(max_length=30)

    # ...
    
    def save(self, *args, **kwargs): # Here
        person = Person(first_name='Soi', last_name='Tato')
        person.save()

So, it seems like person.save() calls save() in Person class again and again, then finally caused the error.

Answer 4

I would assume you're trying to create member object properties

''represents a class instance of a blog entry'''
    title = models.CharField(max_length=100)
    created = models.DateTimeField()
    body = models.TextField()

which should ideally go into the constructor method under

 def __init__(self):
''represents a class instance of a blog entry'''
    title = models.CharField(max_length=100)
    created = models.DateTimeField()
    body = models.TextField()