From be693bee4beef5866a901a81c74e6ef91bb06ecd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Laura=20Kl=C3=BCnder?= <laura@codingcatgirl.de>
Date: Thu, 27 Dec 2018 22:02:07 +0100
Subject: [PATCH] clear cache after each map update

---
 src/c3nav/mapdata/utils/cache/local.py | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/c3nav/mapdata/utils/cache/local.py b/src/c3nav/mapdata/utils/cache/local.py
index 7d4f3c13..2d081b25 100644
--- a/src/c3nav/mapdata/utils/cache/local.py
+++ b/src/c3nav/mapdata/utils/cache/local.py
@@ -2,6 +2,8 @@ from collections import OrderedDict
 
 from django.core.cache import cache
 
+from c3nav.mapdata.models import MapUpdate
+
 
 class NoneFromCache:
     pass
@@ -12,7 +14,9 @@ class LocalCacheProxy:
     # only usable for stuff that never changes, obviously
     def __init__(self, maxsize=128):
         self._maxsize = maxsize
+        self._mapupdate = None
         self._items = OrderedDict()
+        self._check_mapupdate()
 
     def get(self, key, default=None):
         print('get')
@@ -36,7 +40,14 @@ class LocalCacheProxy:
         while len(self._items) > self._maxsize:
             self._items.pop(next(iter(self._items.keys())))
 
+    def _check_mapupdate(self):
+        mapupdate = MapUpdate.current_cache_key()
+        if self._mapupdate != mapupdate:
+            self._items = []
+            self._mapupdate = mapupdate
+
     def set(self, key, value, expire):
+        self._check_mapupdate()
         cache.set(key, value, expire)
         self._items[key] = value
         self._prune()