• Upgraded mod_wsgi to 3.3
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The default TEMPLATE_CONTEXT_PROCESSORS is without the django.core.context_processors.request

TEMPLATE_CONTEXT_PROCESSORS = (
      "django.contrib.auth.context_processors.auth",
      "django.core.context_processors.request",
      "django.core.context_processors.debug",
      "django.core.context_processors.i18n",
      "django.core.context_processors.media",
      "django.contrib.messages.context_processors.messages",
)

Hope this works for you.

     print request.session.session_key

We can have the same with Apache/modwsgi, all you need to do is the following:
pre requirements: Linux, python, apache, modwsgi running with WSGIDaemonProcess

1) Find the site-packages of your current python

python -c "from distutils.sysconfig import get_python_lib; print get_python_lib()"

2) monitor.py , copy this file inside your site-packages directory

import os
import sys
import time
import signal
import threading
import atexit
import Queue

_interval = 1.0
_times = {}
_files = []

_running = False
_queue = Queue.Queue()
_lock = threading.Lock()

def _restart(path):
    _queue.put(True)
    prefix = 'monitor (pid=%d):' % os.getpid()
    print >> sys.stderr, '%s Change detected to \'%s\'.' % (prefix, path)
    print >> sys.stderr, '%s Triggering process restart.' % prefix
    os.kill(os.getpid(), signal.SIGINT)

def _modified(path):
    try:
        # If path doesn't denote a file and were previously
        # tracking it, then it has been removed or the file type
        # has changed so force a restart. If not previously
        # tracking the file then we can ignore it as probably
        # pseudo reference such as when file extracted from a
        # collection of modules contained in a zip file.

        if not os.path.isfile(path):
            return path in _times

        # Check for when file last modified.

        mtime = os.stat(path).st_mtime
        if path not in _times:
            _times[path] = mtime

        # Force restart when modification time has changed, even
        # if time now older, as that could indicate older file
        # has been restored.

        if mtime != _times[path]:
            return True
    except:
        # If any exception occured, likely that file has been
        # been removed just before stat(), so force a restart.

        return True

    return False

def _monitor():
    while 1:
        # Check modification times on all files in sys.modules.

        for module in sys.modules.values():
            if not hasattr(module, '__file__'):
                continue
            path = getattr(module, '__file__')
            if not path:
                continue
            if os.path.splitext(path)[1] in ['.pyc', '.pyo', '.pyd']:
                path = path[:-1]
            if _modified(path):
                return _restart(path)

        # Check modification times on files which have
        # specifically been registered for monitoring.

        for path in _files:
            if _modified(path):
                return _restart(path)

        # Go to sleep for specified interval.

        try:
            return _queue.get(timeout=_interval)
        except:
            pass

_thread = threading.Thread(target=_monitor)
_thread.setDaemon(True)

def _exiting():
    try:
        _queue.put(True)
    except:
        pass
    _thread.join()

atexit.register(_exiting)

def track(path):
    if not path in _files:
        _files.append(path)

def start(interval=1.0):
    global _interval
    if interval < _interval:
        _interval = interval

    global _running
    _lock.acquire()
    if not _running:
        prefix = 'monitor (pid=%d):' % os.getpid()
        print >> sys.stderr, '%s Starting change monitor.' % prefix
        _running = True
        _thread.start()
    _lock.release()

3) Finally edit your application WSGI file and add the following before your application=django.core.handlers.wsgi.WSGIHandler():

...
import monitor

monitor.start(interval=5.0) # check every 5 seconds

for root,dirs,files in os.walk('/some/folder/where/your/app/is'):
        for x in files:
            if os.path.splitext(x)[1].lower() == '.py': # only .py files please.
                monitor.track(root + x)
...

original code is at http://code.google.com/p/modwsgi/wiki/ReloadingSourceCode#Monitoring_For_Code_Changes

>>> import django
>>> django.VERSION
(1, 2, 1, 'final', 0)
>>> django.get_version()
u'1.2.1 SVN-13348'
>>>

All you need to do is the following:
1) Add a admin.py (if you don’t already have yet…) for your app

from django.db import models
from django.contrib import admin

from myapp.hotels.models import Hotel

class HotelAdmin(admin.ModelAdmin):
    ...
    class Media:
        js = ("/media/javascript/yourjs.js",)

admin.site.register(Hotel, HotelAdmin)

2) Create a file yourjs.js under /media/javascript

(function($) {
    $(document).ready(function($) {
         // you can now use jquery / javascript here...
         alert('It worked.');
    });
})(django.jQuery);

3) Open the admin for your application and you should see the ‘It worked’ message.

from django.db.models import F

# views.py ...
offer = Offer.objects.get(...)
# SQL: UPDATE field_to_increment = field_to_increment + 1 ...
offer.field_to_increment = F('field_to_increment') + 1
offer.save()

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