From 74828e140989156c1829dda35dab259af1cc374e Mon Sep 17 00:00:00 2001
From: Jeremy Stretch <jstretch@digitalocean.com>
Date: Tue, 11 Jul 2017 14:52:50 -0400
Subject: [PATCH] Fixes #1334: Fix server error when adding an interface to a
 device

---
 netbox/circuits/forms.py | 2 +-
 netbox/dcim/forms.py     | 4 ++--
 netbox/ipam/forms.py     | 4 ++--
 netbox/tenancy/forms.py  | 2 +-
 4 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/netbox/circuits/forms.py b/netbox/circuits/forms.py
index c1ed007e2..d9954e55b 100644
--- a/netbox/circuits/forms.py
+++ b/netbox/circuits/forms.py
@@ -244,7 +244,7 @@ class CircuitTerminationForm(BootstrapMixin, ChainedFieldsMixin, forms.ModelForm
         # Initialize helper selectors
         instance = kwargs.get('instance')
         if instance and instance.interface is not None:
-            initial = kwargs.get('initial', {})
+            initial = kwargs.get('initial', {}).copy()
             initial['rack'] = instance.interface.device.rack
             initial['device'] = instance.interface.device
             kwargs['initial'] = initial
diff --git a/netbox/dcim/forms.py b/netbox/dcim/forms.py
index 65f73c45f..3b596b5ae 100644
--- a/netbox/dcim/forms.py
+++ b/netbox/dcim/forms.py
@@ -630,7 +630,7 @@ class DeviceForm(BootstrapMixin, TenancyForm, CustomFieldForm):
         instance = kwargs.get('instance')
         # 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 = kwargs.get('initial', {}).copy()
             initial['manufacturer'] = instance.device_type.manufacturer
             kwargs['initial'] = initial
 
@@ -1479,7 +1479,7 @@ class InterfaceCreateForm(DeviceComponentForm):
     def __init__(self, *args, **kwargs):
 
         # Set interfaces enabled by default
-        kwargs['initial'] = kwargs.get('initial', {})
+        kwargs['initial'] = kwargs.get('initial', {}).copy()
         kwargs['initial'].update({'enabled': True})
 
         super(InterfaceCreateForm, self).__init__(*args, **kwargs)
diff --git a/netbox/ipam/forms.py b/netbox/ipam/forms.py
index 7eb9a9599..f290335d2 100644
--- a/netbox/ipam/forms.py
+++ b/netbox/ipam/forms.py
@@ -217,7 +217,7 @@ class PrefixForm(BootstrapMixin, TenancyForm, CustomFieldForm):
 
         # Initialize helper selectors
         instance = kwargs.get('instance')
-        initial = kwargs.get('initial', {})
+        initial = kwargs.get('initial', {}).copy()
         if instance and instance.vlan is not None:
             initial['vlan_group'] = instance.vlan.group
         kwargs['initial'] = initial
@@ -492,7 +492,7 @@ class IPAddressForm(BootstrapMixin, TenancyForm, ReturnURLForm, CustomFieldForm)
 
         # Initialize helper selectors
         instance = kwargs.get('instance')
-        initial = kwargs.get('initial', {})
+        initial = kwargs.get('initial', {}).copy()
         if instance and instance.interface is not None:
             initial['interface_site'] = instance.interface.device.site
             initial['interface_rack'] = instance.interface.device.rack
diff --git a/netbox/tenancy/forms.py b/netbox/tenancy/forms.py
index 9950abfc2..969050841 100644
--- a/netbox/tenancy/forms.py
+++ b/netbox/tenancy/forms.py
@@ -102,7 +102,7 @@ class TenancyForm(ChainedFieldsMixin, forms.Form):
         # Initialize helper selector
         instance = kwargs.get('instance')
         if instance and instance.tenant is not None:
-            initial = kwargs.get('initial', {})
+            initial = kwargs.get('initial', {}).copy()
             initial['tenant_group'] = instance.tenant.group
             kwargs['initial'] = initial