Fixes #8077: Fix exception when attaching image to location, circuit, or power panel

Author: jeremystretch

docs/release-notes/version-3.1.md

@@ -11,6 +11,7 @@
 
 * [#7674](https://github.com/netbox-community/netbox/issues/7674) - Fix inadvertent application of device type context to virtual machines
 * [#8074](https://github.com/netbox-community/netbox/issues/8074) - Ordering VMs by name should reference naturalized value
+* [#8077](https://github.com/netbox-community/netbox/issues/8077) - Fix exception when attaching image to location, circuit, or power panel
 * [#8078](https://github.com/netbox-community/netbox/issues/8078) - Add missing wireless models to `lsmodels()` in `nbshell`
 * [#8079](https://github.com/netbox-community/netbox/issues/8079) - Fix validation of LLDP neighbors when connected device has an asset tag
 

netbox/extras/api/serializers.py

@@ -170,17 +170,7 @@ def validate(self, data):
 
     @swagger_serializer_method(serializer_or_field=serializers.DictField)
     def get_parent(self, obj):
-
-        # Static mapping of models to their nested serializers
-        if isinstance(obj.parent, Device):
-            serializer = NestedDeviceSerializer
-        elif isinstance(obj.parent, Rack):
-            serializer = NestedRackSerializer
-        elif isinstance(obj.parent, Site):
-            serializer = NestedSiteSerializer
-        else:
-            raise Exception("Unexpected type of parent object for ImageAttachment")
-
+        serializer = get_serializer_for_model(obj.parent, prefix='Nested')
         return serializer(obj.parent, context={'request': self.context['request']}).data