Ticket #17080: Deserializer.patch

django/core/serializers/python.py

@@ -122 +122 @@
                         data[field.attname] = field.rel.to._meta.get_field(field.rel.field_name).to_python(field_value)
                 else:
                     data[field.attname] = None
+            
+            # any custom field type where attname is different to name (and is not
+            # caught already by checks above) needs instantiating by attname due to
+            # the way Model.__init__ is written currently
+            elif field.name != field.attname:
+                data[field.attname] = field.to_python(field_value)
 
             # Handle all other fields
             else: