From d24e3b37ca5d0e8e19c2d10d8b5709d74c989ea5 Mon Sep 17 00:00:00 2001
From: Denick <1049485+apie@users.noreply.github.com>
Date: Wed, 9 Sep 2020 22:12:11 +0200
Subject: [PATCH] Cast memoryview objects to bytes to be able to pickle them.
 (#163)

Fixes #125
---
 cachalot/apps.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/cachalot/apps.py b/cachalot/apps.py
index 58088f5..87b0ab6 100644
--- a/cachalot/apps.py
+++ b/cachalot/apps.py
@@ -1,3 +1,4 @@
+import copyreg
 from django import __version__ as django__version__, VERSION as django_version
 from django.apps import AppConfig
 from django.conf import settings
@@ -93,4 +94,7 @@ class CachalotConfig(AppConfig):
     name = 'cachalot'
 
     def ready(self):
+        # Cast memoryview objects to bytes to be able to pickle them.
+        # https://docs.python.org/3/library/copyreg.html#copyreg.pickle
+        copyreg.pickle(memoryview, lambda val: (memoryview, (bytes(val),)))
         cachalot_settings.load()