Improved code [skip ci]

Author: ankane

pgvector/halfvec.py

@@ -108,10 +108,11 @@ def _from_db(cls, value: str | HalfVector | None) -> list[float] | None:
         if value is None:
             return value
 
-        if isinstance(value, str):
-            return cls._list_from_text(value)
+        # Handle conversion from low-level driver
+        if isinstance(value, HalfVector):
+            return value.to_list()
 
-        return value.to_list()
+        return cls._list_from_text(value)
 
     @classmethod
     def _list_from_text(cls, value: str) -> list[float]:

pgvector/vector.py

@@ -106,10 +106,11 @@ def _from_db(cls, value: str | Vector | None) -> list[float] | None:
         if value is None:
             return value
 
-        if isinstance(value, str):
-            return cls._list_from_text(value)
+        # Handle conversion from low-level driver
+        if isinstance(value, Vector):
+            return value.to_list()
 
-        return value.to_list()
+        return cls._list_from_text(value)
 
     @classmethod
     def _list_from_text(cls, value: str) -> list[float]: