implement caching for get_hosting_package

docs/changelog.rst

@@ -1,6 +1,9 @@
 Changelog
 =========
 
+* :support:`-` cache result of get_hosting_package method of
+  gvawebcore.views.HostingPackageAndCustomerMixin to improve page loading
+  performance
 * :feature:`-` add ability to add, list and delete SSH public keys assigned to
   a hosting package's operating system user and change their comments
 * :feature:`-` add ability to add SSH public keys for operating system users

gnuviechadmin/gvawebcore/views.py

@@ -17,10 +17,14 @@ class HostingPackageAndCustomerMixin(object):
     hosting_package_kwarg = 'package'
     """Keyword argument used to find the hosting package in the URL."""
 
+    hostingpackage = None
+
     def get_hosting_package(self):
-        return get_object_or_404(
-            CustomerHostingPackage,
-            pk=int(self.kwargs[self.hosting_package_kwarg]))
+        if self.hostingpackage is None:
+            self.hostingpackage = get_object_or_404(
+                CustomerHostingPackage,
+                pk=int(self.kwargs[self.hosting_package_kwarg]))
+        return self.hostingpackage
 
     def get_customer_object(self):
         return self.get_hosting_package().customer