From 59b6b6ed780d6f2720665ddf5e290b01cafd3e7b Mon Sep 17 00:00:00 2001
From: James <james.baster@opendataservices.coop>
Date: Thu, 7 Apr 2022 10:25:57 +0100
Subject: [PATCH] Transaction by sector download: Eager load joined tables

Performance boost to /api/1/access/transaction/by_sector.csv

https://github.com/codeforIATI/iati-datastore/issues/346

Similiar to 863253cb3c83aed862908d77c310883d13131e0c
---
 iati_datastore/iatilib/frontend/dsfilter.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/iati_datastore/iatilib/frontend/dsfilter.py b/iati_datastore/iatilib/frontend/dsfilter.py
index bced2093..3ddf200b 100644
--- a/iati_datastore/iatilib/frontend/dsfilter.py
+++ b/iati_datastore/iatilib/frontend/dsfilter.py
@@ -361,7 +361,12 @@ def transactions_by_sector(args):
     return _filter(
         db.session.query(Transaction, SectorPercentage)
         .join(Activity, Activity.iati_identifier==Transaction.activity_id)
-        .join(SectorPercentage),
+        .join(SectorPercentage)
+        .options(
+            orm.selectinload(Transaction.recipient_country_percentages),
+            orm.selectinload(Transaction.recipient_region_percentages),
+            orm.selectinload(Transaction.sector_percentages),
+        ),
         args
     )