Resolved RemovedInDjango20Warning deprecation warnings

netbox/circuits/models.py

@@ -1,6 +1,6 @@
 from django.contrib.contenttypes.fields import GenericRelation
-from django.core.urlresolvers import reverse
 from django.db import models
+from django.urls import reverse
 from django.utils.encoding import python_2_unicode_compatible
 
 from dcim.fields import ASNField
@@ -150,7 +150,9 @@ class CircuitTermination(models.Model):
     circuit = models.ForeignKey('Circuit', related_name='terminations', on_delete=models.CASCADE)
     term_side = models.CharField(max_length=1, choices=TERM_SIDE_CHOICES, verbose_name='Termination')
     site = models.ForeignKey('dcim.Site', related_name='circuit_terminations', on_delete=models.PROTECT)
-    interface = models.OneToOneField('dcim.Interface', related_name='circuit_termination', blank=True, null=True)
+    interface = models.OneToOneField(
+        'dcim.Interface', related_name='circuit_termination', blank=True, null=True, on_delete=models.CASCADE
+    )
     port_speed = models.PositiveIntegerField(verbose_name='Port speed (Kbps)')
     upstream_speed = models.PositiveIntegerField(blank=True, null=True, verbose_name='Upstream speed (Kbps)',
                                                  help_text='Upstream speed, if different from port speed')

netbox/circuits/views.py

@@ -1,10 +1,10 @@
 from django.contrib import messages
 from django.contrib.auth.decorators import permission_required
 from django.contrib.auth.mixins import PermissionRequiredMixin
-from django.core.urlresolvers import reverse
 from django.db import transaction
 from django.db.models import Count
 from django.shortcuts import get_object_or_404, redirect, render
+from django.urls import reverse
 
 from extras.models import Graph, GRAPH_TYPE_PROVIDER
 from utilities.forms import ConfirmationForm