fix(chroma): wrap update() ids/embeddings/metadatas in lists (#5757)

tests/vector_stores/test_chroma.py

@@ -133,7 +133,31 @@ def test_update_vector(chromadb_instance):
     chromadb_instance.update(vector_id=vector_id, vector=new_vector, payload=new_payload)
 
     chromadb_instance.collection.update.assert_called_once_with(
-        ids=vector_id, embeddings=new_vector, metadatas=new_payload
+        ids=[vector_id], embeddings=[new_vector], metadatas=[new_payload]
+    )
+
+
+def test_update_vector_metadata_only(chromadb_instance):
+    # Metadata-only update (vector=None) must not wrap None in a list.
+    vector_id = "id1"
+    new_payload = {"name": "updated_vector"}
+
+    chromadb_instance.update(vector_id=vector_id, vector=None, payload=new_payload)
+
+    chromadb_instance.collection.update.assert_called_once_with(
+        ids=[vector_id], embeddings=None, metadatas=[new_payload]
+    )
+
+
+def test_update_vector_embedding_only(chromadb_instance):
+    # Vector-only update (payload=None) must not wrap None in a list.
+    vector_id = "id1"
+    new_vector = [0.7, 0.8, 0.9]
+
+    chromadb_instance.update(vector_id=vector_id, vector=new_vector, payload=None)
+
+    chromadb_instance.collection.update.assert_called_once_with(
+        ids=[vector_id], embeddings=[new_vector], metadatas=None
     )