Make filters in admin be sticky, according to:

http://code.djangoproject.com/ticket/3777

1 files changed, 36 insertions, 0 deletions

diff --git a/postgresqleu/util/middleware.py b/postgresqleu/util/middleware.py
new file mode 100644
index 00000000..265520c9
--- /dev/null
+++ b/postgresqleu/util/middleware.py
@@ -0,0 +1,36 @@
+from django import http
+
+class FilterPersistMiddleware(object):
+	def process_request(self, request):
+
+		path = request.path
+		if path.find('/admin/') != -1: #Dont waste time if we are not in admin
+			query_string = request.META['QUERY_STRING']
+			if not request.META.has_key('HTTP_REFERER'):
+				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)]
+			key = 'key'+path.replace('/','_')
+
+			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