Adding invoice pdf link to Order admin

shop/admin.py

@@ -8,6 +8,7 @@ admin.site.register(models.CoinifyAPIInvoice)
 admin.site.register(models.CoinifyAPICallback)
 admin.site.register(models.Invoice)
 
+
 @admin.register(models.ProductCategory)
 class ProductCategoryAdmin(admin.ModelAdmin):
     list_display = [
@@ -35,9 +36,9 @@ class TicketInline(admin.TabularInline):
 
 
 
-
 @admin.register(models.Order)
 class OrderAdmin(admin.ModelAdmin):
+    change_form_template = 'admin/change_order_form.html'
     list_display = [
         'id',
         'user',
@@ -67,4 +68,4 @@ class OrderAdmin(admin.ModelAdmin):
 
 @admin.register(models.Ticket)
 class TicketAdmin(admin.ModelAdmin):
-    pass
+    pass

shop/models.py

@@ -2,6 +2,7 @@ from django.conf import settings
 from django.db import models
 from django.db.models.aggregates import Sum
 from django.contrib.postgres.fields import DateTimeRangeField, JSONField
+from django.http import HttpResponse
 from django.utils.text import slugify
 from django.utils.translation import ugettext_lazy as _
 from django.utils import timezone

shop/templates/admin/change_order_form.html

@@ -0,0 +1,16 @@
+{% extends "admin/change_form.html" %}
+{% load i18n admin_urls admin_static admin_modify %}
+
+{% block object-tools-items %}
+<li>
+    {% url opts|admin_urlname:'history' original.pk|admin_urlquote as history_url %}
+    <a href="{% add_preserved_filters history_url %}" class="historylink">{% trans "History" %}</a>
+</li>
+{% if original.paid and original.invoice %}
+<li>
+  {% url 'shop:download_invoice' original.pk|admin_urlquote as invoice_url %}
+  <a href="{% add_preserved_filters invoice_url %}" class="historylink">{% trans "Invoice PDF" %}</a>
+</li>
+{% endif %}
+{% if has_absolute_url %}<li><a href="{{ absolute_url }}" class="viewsitelink">{% trans "View on site" %}</a></li>{% endif %}
+{% endblock %}

shop/views.py

@@ -39,11 +39,13 @@ from vendor.coinify_api import CoinifyAPI
 from vendor.coinify_callback import CoinifyCallback
 import json
 
+
 class EnsureUserOwnsOrderMixin(SingleObjectMixin):
     model = Order
 
     def dispatch(self, request, *args, **kwargs):
-        if self.get_object().user != request.user:
+        # If the user does not own this ticket OR is not staff
+        if self.get_object().user != request.user or not request.user.is_staff:
             raise Http404("Order not found")
 
         return super(EnsureUserOwnsOrderMixin, self).dispatch(