From 8d4c686ae2b5d1c82dd87e4aa645546c65719e2b Mon Sep 17 00:00:00 2001
From: Jeremy Stretch <jstretch@digitalocean.com>
Date: Fri, 29 Jun 2018 14:09:20 -0400
Subject: [PATCH] Fixes #2192: Prevent a 0U device from being assigned to a
 rack position

---
 netbox/dcim/models.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/netbox/dcim/models.py b/netbox/dcim/models.py
index 39bd4ad3d..95e9299b8 100644
--- a/netbox/dcim/models.py
+++ b/netbox/dcim/models.py
@@ -963,6 +963,12 @@ class Device(CreatedUpdatedModel, CustomFieldModel):
                 'face': "Must specify rack face when defining rack position.",
             })
 
+        # Prevent 0U devices from being assigned to a specific position
+        if self.position and self.device_type.u_height == 0:
+            raise ValidationError({
+                'position': "A U0 device type ({}) cannot be assigned to a rack position.".format(self.device_type)
+            })
+
         if self.rack:
 
             try: