Fix more Python 3.10+ union type parsing issues (#14)

* Fix parsing Python 3.10+ type hints when encoding search filters.
* Fix parsing Python 3.10+ type hints when decoding record values.
* Add missing release note for fixing parsing Python 3.10+ type hints when evaluating model refs.

Co-authored-by: Callum Dickinson <callum.dickinson@catalystcloud.nz>

Author: Callum027

changelog.d/12.fixed.md

@@ -0,0 +1 @@
+Fix parsing Python 3.10+ union type hints when evaluating model refs

changelog.d/14.fixed.md

@@ -0,0 +1 @@
+Fix parsing Python 3.10+ union type hints when encoding search filters, and decoding record values

openstack_odooclient/base/record.py

@@ -395,10 +395,9 @@ def _getattr_model_ref(
         attr_type_origin = get_type_origin(attr_type)
         if attr_type_origin is Union or attr_type_origin is UnionType:
             unsupported_union = (
-                "Only unions of the format Optional[T], "
-                "Union[T, type(None)] or Union[T, Literal[False]] "
-                "are supported for singular model refs, "
-                f"found type hint: {attr_type}"
+                "Only unions of the format 'T | None' "
+                "or 'T | Literal[False]' are supported for singular "
+                f"model refs, found type hint: {attr_type}"
             )
             union_types = set(get_type_args(attr_type))
             if len(union_types) > 2:  # noqa: PLR2004
@@ -465,7 +464,7 @@ def _decode_value(cls, type_hint: Any, value: Any) -> Any:
         # Not suitable for handling complicated union structures.
         # TODO(callumdickinson): Find a way to handle complicated
         # union structures more smartly.
-        if value_type is Union:
+        if value_type is Union or value_type is UnionType:
             attr_union_types = get_type_args(type_hint)
             if len(attr_union_types) == 2:  # noqa: PLR2004
                 # T | None

openstack_odooclient/base/record_manager.py

@@ -18,7 +18,7 @@
 import builtins
 
 from datetime import date, datetime
-from types import MappingProxyType
+from types import MappingProxyType, UnionType
 from typing import (
     TYPE_CHECKING,
     Annotated,
@@ -961,25 +961,32 @@ def _encode_value(self, type_hint: Any, value: Any) -> Any:
             return value
         # For every other field type, parse the possible value types
         # from the type hint.
+        # First, remove Annotated to get the actual attribute type.
         type_hint_origin = get_type_origin(type_hint) or type_hint
         attr_type = (
             get_type_args(type_hint)[0]
             if type_hint_origin is Annotated
-            else type_hint_origin
+            else type_hint
         )
+        # Next, get a list of allowed values types from the attribute type.
+        # If there is only one, create a list containing only that type.
         attr_type_origin = get_type_origin(attr_type) or attr_type
         value_types = (
             get_type_args(attr_type)
-            if attr_type_origin is Union
-            else [attr_type_origin]
+            if attr_type_origin is Union or attr_type_origin is UnionType
+            else [attr_type]
         )
         # Recursively handle the types that need to be serialised.
         for value_type in value_types:
+            value_type_origin = get_type_origin(value_type) or value_type
             if value_type is date and isinstance(value, date):
                 return value.strftime(DEFAULT_SERVER_DATE_FORMAT)
             if value_type is datetime and isinstance(value, datetime):
                 return value.strftime(DEFAULT_SERVER_DATETIME_FORMAT)
-            if value_type is list and isinstance(value, (list, set, tuple)):
-                v_type = get_type_args(type_hint)[0]
+            if value_type_origin is list and isinstance(
+                value,
+                (list, set, tuple),
+            ):
+                v_type = get_type_args(value_type)[0]
                 return [self._encode_value(v_type, v) for v in value]
         return value