upgrade django version from 4.2 to 5.1

pyproject.toml

@@ -16,10 +16,10 @@ classifiers = [
   "Environment :: Web Environment",
   "License :: OSI Approved :: Apache License, Version 2.0",
   "Programming Language :: Python :: 3.11",
-  "Framework :: Django :: 4.2",
+  "Framework :: Django :: 5.1",
 ]
 dependencies = [
-        'Django==4.2.*',
+        'Django==5.1.*',
         'djangorestframework==3.15.*',
         'python-dateutil==2.9.*',
         'isoweek',
@@ -103,7 +103,7 @@ dependencies = [
 [project.optional-dependencies]
 memcached = ["pylibmc"]
 dev = [
-            'django-debug-toolbar==4.0.*',
+            'django-debug-toolbar==4.4.*',
             'pycodestyle==2.12.*',
             'pyflakes==3.2.*',
             'flake8==7.1.*',

src/pretix/base/js_catalog_template.py

@@ -0,0 +1,104 @@
+js_catalog_template = r"""
+{% autoescape off %}
+'use strict';
+{
+  const globals = this;
+  const django = globals.django || (globals.django = {});
+
+  {% if plural %}
+  django.pluralidx = function(n) {
+    const v = {{ plural }};
+    if (typeof v === 'boolean') {
+      return v ? 1 : 0;
+    } else {
+      return v;
+    }
+  };
+  {% else %}
+  django.pluralidx = function(count) { return (count == 1) ? 0 : 1; };
+  {% endif %}
+
+  /* gettext library */
+
+  django.catalog = django.catalog || {};
+  {% if catalog_str %}
+  const newcatalog = {{ catalog_str }};
+  for (const key in newcatalog) {
+    django.catalog[key] = newcatalog[key];
+  }
+  {% endif %}
+
+  if (!django.jsi18n_initialized) {
+    django.gettext = function(msgid) {
+      const value = django.catalog[msgid];
+      if (typeof value === 'undefined') {
+        return msgid;
+      } else {
+        return (typeof value === 'string') ? value : value[0];
+      }
+    };
+
+    django.ngettext = function(singular, plural, count) {
+      const value = django.catalog[singular];
+      if (typeof value === 'undefined') {
+        return (count == 1) ? singular : plural;
+      } else {
+        return value.constructor === Array ? value[django.pluralidx(count)] : value;
+      }
+    };
+
+    django.gettext_noop = function(msgid) { return msgid; };
+
+    django.pgettext = function(context, msgid) {
+      let value = django.gettext(context + '\x04' + msgid);
+      if (value.includes('\x04')) {
+        value = msgid;
+      }
+      return value;
+    };
+
+    django.npgettext = function(context, singular, plural, count) {
+      let value = django.ngettext(context + '\x04' + singular, context + '\x04' + plural, count);
+      if (value.includes('\x04')) {
+        value = django.ngettext(singular, plural, count);
+      }
+      return value;
+    };
+
+    django.interpolate = function(fmt, obj, named) {
+      if (named) {
+        return fmt.replace(/%\(\w+\)s/g, function(match){return String(obj[match.slice(2,-2)])});
+      } else {
+        return fmt.replace(/%s/g, function(match){return String(obj.shift())});
+      }
+    };
+
+
+    /* formatting library */
+
+    django.formats = {{ formats_str }};
+
+    django.get_format = function(format_type) {
+      const value = django.formats[format_type];
+      if (typeof value === 'undefined') {
+        return format_type;
+      } else {
+        return value;
+      }
+    };
+
+    /* add to global namespace */
+    globals.pluralidx = django.pluralidx;
+    globals.gettext = django.gettext;
+    globals.ngettext = django.ngettext;
+    globals.gettext_noop = django.gettext_noop;
+    globals.pgettext = django.pgettext;
+    globals.npgettext = django.npgettext;
+    globals.interpolate = django.interpolate;
+    globals.get_format = django.get_format;
+
+    django.jsi18n_initialized = true;
+  }
+};
+{% endautoescape %}
+"""  # NOQA

src/pretix/base/signals.py

@@ -21,10 +21,16 @@ def _populate_app_cache():
 class EventPluginSignal(django.dispatch.Signal):
     """
     This is an extension to Django's built-in signals which differs in a way that it sends
-    out it's events only to receivers which belong to plugins that are enabled for the given
+    out its events only to receivers which belong to plugins that are enabled for the given
     Event.
     """
 
+    def get_live_receivers(self, sender):
+        receivers = self._live_receivers(sender)
+        if not receivers:
+            return []
+        return receivers[0]
+
     def _is_active(self, sender, receiver):
         if sender is None:
             # Send to all events!
@@ -65,7 +71,7 @@ def send(self, sender: Event, **named) -> List[Tuple[Callable, Any]]:
         if not app_cache:
             _populate_app_cache()
 
-        for receiver in self._sorted_receivers(sender):
+        for receiver in self.get_live_receivers(sender):
             if self._is_active(sender, receiver):
                 response = receiver(signal=self, sender=sender, **named)
                 responses.append((receiver, response))
@@ -89,7 +95,7 @@ def send_chained(self, sender: Event, chain_kwarg_name, **named) -> List[Tuple[C
         if not app_cache:
             _populate_app_cache()
 
-        for receiver in self._sorted_receivers(sender):
+        for receiver in self.get_live_receivers(sender):
             if self._is_active(sender, receiver):
                 named[chain_kwarg_name] = response
                 response = receiver(signal=self, sender=sender, **named)
@@ -116,7 +122,7 @@ def send_robust(self, sender: Event, **named) -> List[Tuple[Callable, Any]]:
         if not app_cache:
             _populate_app_cache()
 
-        for receiver in self._sorted_receivers(sender):
+        for receiver in self.get_live_receivers(sender):
             if self._is_active(sender, receiver):
                 try:
                     response = receiver(signal=self, sender=sender, **named)
@@ -126,18 +132,6 @@ def send_robust(self, sender: Event, **named) -> List[Tuple[Callable, Any]]:
                     responses.append((receiver, response))
         return responses
 
-    def _sorted_receivers(self, sender):
-        orig_list = self._live_receivers(sender)
-        sorted_list = sorted(
-            orig_list,
-            key=lambda receiver: (
-                0 if any(receiver.__module__.startswith(m) for m in settings.CORE_MODULES) else 1,
-                receiver.__module__,
-                receiver.__name__,
-            )
-        )
-        return sorted_list
-
 
 class GlobalSignal(django.dispatch.Signal):
     def send_chained(self, sender: Event, chain_kwarg_name, **named) -> List[Tuple[Callable, Any]]:

src/pretix/presale/views/widget.py

@@ -26,11 +26,12 @@
 from django.views.decorators.gzip import gzip_page
 from django.views.decorators.http import condition
 from django.views.i18n import (
-    JavaScriptCatalog, get_formats, js_catalog_template,
+    JavaScriptCatalog, get_formats,
 )
 from lxml import html
 
 from pretix.base.i18n import language
+from pretix.base.js_catalog_template import js_catalog_template
 from pretix.base.models import CartPosition, Event, Quota, SubEvent, Voucher
 from pretix.base.services.cart import error_messages
 from pretix.base.settings import GlobalSettingsObject