Removed node_label parameter from Neo4jMessageHistory

examples/customize/llms/llm_with_neo4j_message_history.py

@@ -34,9 +34,7 @@
     database=DATABASE,
 )
 
-history = Neo4jMessageHistory(
-    session_id="123", driver=driver, node_label="Message", window=10
-)
+history = Neo4jMessageHistory(session_id="123", driver=driver, window=10)
 
 for question in questions:
     res: LLMResponse = llm.invoke(

examples/question_answering/graphrag_with_neo4j_message_history.py

@@ -51,9 +51,7 @@
     llm=llm,
 )
 
-history = Neo4jMessageHistory(
-    session_id="123", driver=driver, node_label="Message", window=10
-)
+history = Neo4jMessageHistory(session_id="123", driver=driver, window=10)
 
 questions = [
     "Who starred in the Apollo 13 movies?",

src/neo4j_graphrag/message_history.py

@@ -129,7 +129,7 @@ class Neo4jMessageHistory(MessageHistory):
         driver = neo4j.GraphDatabase.driver(URI, auth=AUTH)
 
         history = Neo4jMessageHistory(
-            session_id="123", driver=driver, node_label="Message", window=10
+            session_id="123", driver=driver, window=10
         )
 
         message = LLMMessage(role="user", content="Hello!")
@@ -147,33 +147,28 @@ def __init__(
         self,
         session_id: Union[str, int],
         driver: neo4j.Driver,
-        node_label: str = "Session",
         window: Optional[PositiveInt] = None,
     ) -> None:
         validated_data = Neo4jMessageHistoryModel(
             session_id=session_id,
             driver_model=Neo4jDriverModel(driver=driver),
-            node_label=node_label,
             window=window,
         )
         self._driver = validated_data.driver_model.driver
         self._session_id = validated_data.session_id
-        self._node_label = validated_data.node_label
         self._window = (
             "" if validated_data.window is None else validated_data.window - 1
         )
         # Create session node
         self._driver.execute_query(
-            query_=CREATE_SESSION_NODE_QUERY.format(node_label=self._node_label),
+            query_=CREATE_SESSION_NODE_QUERY.format(node_label="Session"),
             parameters_={"session_id": self._session_id},
         )
 
     @property
     def messages(self) -> List[LLMMessage]:
         result = self._driver.execute_query(
-            query_=GET_MESSAGES_QUERY.format(
-                node_label=self._node_label, window=self._window
-            ),
+            query_=GET_MESSAGES_QUERY.format(node_label="Session", window=self._window),
             parameters_={"session_id": self._session_id},
         )
         messages = [
@@ -199,7 +194,7 @@ def add_message(self, message: LLMMessage) -> None:
             message (LLMMessage): The message to add.
         """
         self._driver.execute_query(
-            query_=ADD_MESSAGE_QUERY.format(node_label=self._node_label),
+            query_=ADD_MESSAGE_QUERY.format(node_label="Session"),
             parameters_={
                 "role": message["role"],
                 "content": message["content"],
@@ -210,6 +205,6 @@ def add_message(self, message: LLMMessage) -> None:
     def clear(self) -> None:
         """Clear the message history."""
         self._driver.execute_query(
-            query_=CLEAR_SESSION_QUERY.format(node_label=self._node_label),
+            query_=CLEAR_SESSION_QUERY.format(node_label="Session"),
             parameters_={"session_id": self._session_id},
         )

src/neo4j_graphrag/types.py

@@ -256,17 +256,10 @@ class Text2CypherRetrieverModel(BaseModel):
 class Neo4jMessageHistoryModel(BaseModel):
     session_id: Union[str, int]
     driver_model: Neo4jDriverModel
-    node_label: str = "Session"
     window: Optional[PositiveInt] = None
 
     @field_validator("session_id")
     def validate_session_id(cls, v: Union[str, int]) -> Union[str, int]:
         if isinstance(v, str) and len(v) == 0:
             raise ValueError("session_id cannot be empty")
         return v
-
-    @field_validator("node_label")
-    def validate_node_label(cls, v: str) -> str:
-        if len(v) == 0:
-            raise ValueError("node_label cannot be empty")
-        return v

tests/e2e/test_graphrag_e2e.py

@@ -104,7 +104,6 @@ def test_graphrag_happy_path_with_neo4j_message_history(
     message_history = Neo4jMessageHistory(
         driver=driver,
         session_id="123",
-        node_label="Message",
     )
     message_history.clear()
     message_history.add_messages(

tests/unit/test_message_history.py

@@ -69,27 +69,19 @@ def test_in_memory_message_history_clear() -> None:
 
 def test_neo4j_message_history_invalid_session_id(driver: MagicMock) -> None:
     with pytest.raises(ValidationError) as exc_info:
-        Neo4jMessageHistory(session_id=1.5, driver=driver, node_label="123", window=1)  # type: ignore[arg-type]
+        Neo4jMessageHistory(session_id=1.5, driver=driver, window=1)  # type: ignore[arg-type]
     assert "Input should be a valid string" in str(exc_info.value)
 
 
 def test_neo4j_message_history_invalid_driver() -> None:
     with pytest.raises(ValidationError) as exc_info:
-        Neo4jMessageHistory(session_id="123", driver=1.5, node_label="123", window=1)  # type: ignore[arg-type]
+        Neo4jMessageHistory(session_id="123", driver=1.5, window=1)  # type: ignore[arg-type]
     assert "Input should be an instance of Driver" in str(exc_info.value)
 
 
-def test_neo4j_message_history_invalid_node_label(driver: MagicMock) -> None:
-    with pytest.raises(ValidationError) as exc_info:
-        Neo4jMessageHistory(session_id="123", driver=driver, node_label=1.5, window=1)  # type: ignore[arg-type]
-    assert "Input should be a valid string" in str(exc_info.value)
-
-
 def test_neo4j_message_history_invalid_window(driver: MagicMock) -> None:
     with pytest.raises(ValidationError) as exc_info:
-        Neo4jMessageHistory(
-            session_id="123", driver=driver, node_label="123", window=-1
-        )
+        Neo4jMessageHistory(session_id="123", driver=driver, window=-1)
     assert "Input should be greater than 0" in str(exc_info.value)