From 67282882faae39e21fac626284a5ed3be841911e Mon Sep 17 00:00:00 2001
From: Jeremy Stretch <jstretch@digitalocean.com>
Date: Fri, 12 May 2017 15:55:18 -0400
Subject: [PATCH] Fixed RelatedObjectDoesNotExist error when trying to create a
 new device

---
 netbox/dcim/forms.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/netbox/dcim/forms.py b/netbox/dcim/forms.py
index 09ea6af8c..cdfc8d0a8 100644
--- a/netbox/dcim/forms.py
+++ b/netbox/dcim/forms.py
@@ -596,7 +596,8 @@ class DeviceForm(BootstrapMixin, TenancyForm, CustomFieldForm):
 
         # Initialize helper selectors
         instance = kwargs.get('instance')
-        if instance and instance.device_type is not None:
+        # Using hasattr() instead of "is not None" to avoid RelatedObjectDoesNotExist on required field
+        if instance and hasattr(instance, 'device_type'):
             initial = kwargs.get('initial', {})
             initial['manufacturer'] = instance.device_type.manufacturer
             kwargs['initial'] = initial