more attempts

Author: MoralCode

common/guid.py

@@ -1,5 +1,6 @@
 from __future__ import absolute_import
 import uuid
+from sqlalchemy.dialects.postgresql import UUID
 from sqlalchemy import types, func
 
 #https://docs.sqlalchemy.org/en/13/core/custom_types.html#backend-agnostic-guid-type
@@ -8,16 +9,22 @@ class HashColumn(types.TypeDecorator):
 
     def load_dialect_impl(self, dialect):
         if dialect.name == 'postgresql':
-            return dialect.type_descriptor(uuid.UUID())
+            return dialect.type_descriptor(UUID())
         else:
             return dialect.type_descriptor(types.BINARY(16))
 
 
     def process_bind_param(self, value, dialect):
         if value is None:
             return value
+        elif dialect.name == 'postgresql':
+            return uuid.UUID(value)
         else:
-            return uuid.UUID(hex=value).bytes
+            if not isinstance(value, uuid.UUID):
+                return uuid.UUID(value).bytes
+            else:
+                # bytes
+                return value.bytes
 
     def process_result_value(self, value, dialect):
         if value is None: