Resolved RemovedInDjango20Warning deprecation warnings

netbox/secrets/models.py

@@ -6,8 +6,8 @@ from django.conf import settings
 from django.contrib.auth.hashers import make_password, check_password
 from django.contrib.auth.models import Group, User
 from django.core.exceptions import ValidationError
-from django.core.urlresolvers import reverse
 from django.db import models
+from django.urls import reverse
 from django.utils.encoding import force_bytes, python_2_unicode_compatible
 
 from dcim.models import Device
@@ -69,7 +69,7 @@ class UserKey(CreatedUpdatedModel):
     copy of the master encryption key. The encrypted instance of the master key can be decrypted only with the user's
     matching (private) decryption key.
     """
-    user = models.OneToOneField(User, related_name='user_key', editable=False)
+    user = models.OneToOneField(User, related_name='user_key', editable=False, on_delete=models.CASCADE)
     public_key = models.TextField(verbose_name='RSA public key')
     master_key_cipher = models.BinaryField(max_length=512, blank=True, null=True, editable=False)
 
@@ -283,7 +283,7 @@ class Secret(CreatedUpdatedModel):
     A Secret can be up to 65,536 bytes (64KB) in length. Each secret string will be padded with random data to a minimum
     of 64 bytes during encryption in order to protect short strings from ciphertext analysis.
     """
-    device = models.ForeignKey(Device, related_name='secrets')
+    device = models.ForeignKey(Device, related_name='secrets', on_delete=models.CASCADE)
     role = models.ForeignKey('SecretRole', related_name='secrets', on_delete=models.PROTECT)
     name = models.CharField(max_length=100, blank=True)
     ciphertext = models.BinaryField(editable=False, max_length=65568)  # 16B IV + 2B pad length + {62-65550}B padded