django v2 compatible: tests needed

src/documents/admin.py

@@ -3,7 +3,10 @@ from datetime import datetime
 from django.conf import settings
 from django.contrib import admin
 from django.contrib.auth.models import User, Group
-from django.core.urlresolvers import reverse
+try:
+    from django.core.urlresolvers import reverse
+except:
+    from django.urls import reverse
 from django.templatetags.static import static
 
 from .models import Correspondent, Tag, Document, Log

src/documents/models.py

@@ -10,7 +10,10 @@ from collections import OrderedDict
 from fuzzywuzzy import fuzz
 
 from django.conf import settings
-from django.core.urlresolvers import reverse
+try:
+    from django.core.urlresolvers import reverse
+except:
+    from django.urls import reverse
 from django.db import models
 from django.template.defaultfilters import slugify
 from django.utils import timezone

src/paperless/urls.py

@@ -28,9 +28,9 @@ urlpatterns = [
     # API
     url(
         r"^api/auth/",
-        include('rest_framework.urls', namespace="rest_framework")
+        include(('rest_framework.urls','rest_framework'), namespace="rest_framework")
     ),
-    url(r"^api/", include(router.urls, namespace="drf")),
+    url(r"^api/", include((router.urls, 'drf'), namespace="drf")),
 
     # File downloads
     url(

src/reminders/models.py

@@ -3,6 +3,6 @@ from django.db import models
 
 class Reminder(models.Model):
 
-    document = models.ForeignKey("documents.Document")
+    document = models.ForeignKey("documents.Document",on_delete=models.DO_NOTHING)
     date = models.DateTimeField()
     note = models.TextField(blank=True)