Enable dictionary specification of related objects in API

netbox/utilities/utils.py

@@ -85,6 +85,38 @@ def serialize_object(obj, extra=None):
     return data
 
 
+def dict_to_filter_params(d, prefix=''):
+    """
+    Translate a dictionary of attributes to a nested set of parameters suitable for QuerySet filtering. For example:
+
+        {
+            "name": "Foo",
+            "rack": {
+                "facility_id": "R101"
+            }
+        }
+
+    Becomes:
+
+        {
+            "name": "Foo",
+            "rack__facility_id": "R101"
+        }
+
+    And can be employed as filter parameters:
+
+        Device.objects.filter(**dict_to_filter(attrs_dict))
+    """
+    params = {}
+    for key, val in d.items():
+        k = prefix + key
+        if isinstance(val, dict):
+            params.update(dict_to_filter_params(val, k + '__'))
+        else:
+            params[k] = val
+    return params
+
+
 def deepmerge(original, new):
     """
     Deep merge two dictionaries (new into original) and return a new dict