Upgrade to Django 2.1 (#710)

* Upgrade to Django 2.0

* more models

* i18n foo

* Update setup.py

* Fix Sentry exception PRETIXEU-JC

* Enforce slug uniqueness

* Import sorting

* Upgrade to Django 2.1

* Travis config

* Try to fix PostgreSQL failure

* Smaller test matrix

* staticfiles→static

* Include request in all authenticate() calls

src/pretix/plugins/pretixdroid/models.py

@@ -6,7 +6,7 @@ from django.utils.translation import ugettext_lazy as _
 
 
 class AppConfiguration(models.Model):
-    event = models.ForeignKey('pretixbase.Event')
+    event = models.ForeignKey('pretixbase.Event', on_delete=models.CASCADE)
     key = models.CharField(max_length=190, db_index=True)
     all_items = models.BooleanField(default=True, verbose_name=_('Can scan all products'))
     items = models.ManyToManyField('pretixbase.Item', blank=True, verbose_name=_('Can scan these products'))

src/pretix/plugins/pretixdroid/signals.py

@@ -1,6 +1,6 @@
 
-from django.core.urlresolvers import resolve, reverse
 from django.dispatch import receiver
+from django.urls import resolve, reverse
 from django.utils.translation import ugettext_lazy as _
 
 from pretix.base.signals import logentry_display

src/pretix/plugins/pretixdroid/templates/pretixplugins/pretixdroid/configuration.html

@@ -1,7 +1,7 @@
 {% extends "pretixcontrol/event/base.html" %}
 {% load i18n %}
 {% load bootstrap3 %}
-{% load staticfiles %}
+{% load static %}
 {% block title %}{% trans "Check-in device configuration" %}{% endblock %}
 {% block content %}
     <h1>{% trans "Check-in device configuration" %}</h1>

src/pretix/plugins/pretixdroid/templates/pretixplugins/pretixdroid/configuration_code.html

@@ -1,7 +1,7 @@
 {% extends "pretixcontrol/event/base.html" %}
 {% load i18n %}
 {% load bootstrap3 %}
-{% load staticfiles %}
+{% load static %}
 {% block title %}{% trans "Device configuration" %}{% endblock %}
 {% block content %}
     {% if config.app == "pretixdroid" %}