add admin.FilterPersistMiddleware

middleware/admin.py

@@ -0,0 +1,43 @@
+# see http://code.djangoproject.com/ticket/3777
+
+from django import http
+
+class FilterPersistMiddleware(object):
+    def process_request(self, request):
+        if request.method != 'GET':
+            return None
+        
+        path = request.path
+        if path.find('/admin/') != -1: # Dont waste time if we are not in admin
+            query_string = request.META['QUERY_STRING']
+            key = 'key' + path.replace('/','_')
+            if not request.META.has_key('HTTP_REFERER'):
+                return None
+            if query_string: # Don't modify but save new queries
+                request.session[key] = query_string
+                return None
+            
+            session = request.session
+            if session.get('redirected', False): # so that we dont loop once redirected
+                del session['redirected']
+                return None
+
+            referrer = request.META['HTTP_REFERER'].split('?')[0]
+            referrer = referrer[referrer.find('/admin'):len(referrer)]
+
+            if path == referrer: # We are in same page as before
+                if query_string == '': # Filter is empty, delete it
+                    if session.get(key,False):
+                        del session[key]
+                    return None
+                request.session[key] = query_string
+            else: # We are are coming from another page, restore filter if available
+                if session.get(key, False):
+                    query_string=request.session.get(key)
+                    redirect_to = path+'?'+query_string
+                    request.session['redirected'] = True
+                    return http.HttpResponseRedirect(redirect_to)
+                else:
+                    return None
+        else:
+            return None

settings.py

@@ -70,6 +70,7 @@ MIDDLEWARE_CLASSES = (
     'django.middleware.common.CommonMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',
     'django.contrib.auth.middleware.AuthenticationMiddleware',
+    'texts.middleware.admin.FilterPersistMiddleware',
 )
 
 ROOT_URLCONF = 'texts.urls'