fix: Use the indexed metadata field 'ref_doc_id' instead of 'doc_id' during deletion. (#19759)

Author: KutouAkira

llama-index-integrations/vector_stores/llama-index-vector-stores-postgres/llama_index/vector_stores/postgres/base.py

@@ -1070,7 +1070,7 @@ def delete(self, ref_doc_id: str, **delete_kwargs: Any) -> None:
         self._initialize()
         with self._session() as session, session.begin():
             stmt = delete(self._table_class).where(
-                self._table_class.metadata_["doc_id"].astext == ref_doc_id
+                self._table_class.metadata_["ref_doc_id"].astext == ref_doc_id
             )
 
             session.execute(stmt)
@@ -1082,7 +1082,7 @@ async def adelete(self, ref_doc_id: str, **delete_kwargs: Any) -> None:
         self._initialize()
         async with self._async_session() as session, session.begin():
             stmt = delete(self._table_class).where(
-                self._table_class.metadata_["doc_id"].astext == ref_doc_id
+                self._table_class.metadata_["ref_doc_id"].astext == ref_doc_id
             )
 
             await session.execute(stmt)