From 60cf2dcbd7a7068d0a7300df5acf9e8e7fad3593 Mon Sep 17 00:00:00 2001
From: Jens Gutermuth <jens@gutermuth-online.de>
Date: Mon, 23 Mar 2015 01:58:12 +0100
Subject: [PATCH] Fix three N+1 queries in pin loading

Fetch the submitter with a join and get all the images and tags in one
query each. This reduces the total query count for loading 50 pins from
304 to 158.

See issue #85.
---
 pinry/core/api.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pinry/core/api.py b/pinry/core/api.py
index 56a4b21..334c019 100644
--- a/pinry/core/api.py
+++ b/pinry/core/api.py
@@ -135,7 +135,8 @@ class PinResource(ModelResource):
         filtering = {
             'submitter': ALL_WITH_RELATIONS
         }
-        queryset = Pin.objects.all()
+        queryset = Pin.objects.all().select_related('submitter'). \
+            prefetch_related('image', 'tags')
         resource_name = 'pin'
         include_resource_uri = False
         always_return_data = True