community[patch]: chat message history mypy fixes (#17059)

Related to #17048

libs/community/langchain_community/chat_message_histories/elasticsearch.py

@@ -47,7 +47,7 @@ class ElasticsearchChatMessageHistory(BaseChatMessageHistory):
     ):
         self.index: str = index
         self.session_id: str = session_id
-        self.ensure_ascii: bool = esnsure_ascii  # type: ignore[assignment]
+        self.ensure_ascii = esnsure_ascii
 
         # Initialize Elasticsearch client from passed client arg or connection info
         if es_connection is not None:
@@ -177,7 +177,7 @@ class ElasticsearchChatMessageHistory(BaseChatMessageHistory):
                     "created_at": round(time() * 1000),
                     "history": json.dumps(
                         message_to_dict(message),
-                        ensure_ascii=self.ensure_ascii,
+                        ensure_ascii=bool(self.ensure_ascii),
                     ),
                 },
                 refresh=True,

libs/community/langchain_community/chat_message_histories/sql.py

@@ -39,7 +39,7 @@ class BaseMessageConverter(ABC):
         raise NotImplementedError
 
 
-def create_message_model(table_name, DynamicBase):  # type: ignore
+def create_message_model(table_name: str, DynamicBase: Any) -> Any:
     """
     Create a message model for a given table name.
 
@@ -52,8 +52,8 @@ def create_message_model(table_name, DynamicBase):  # type: ignore
 
     """
 
-    # Model decleared inside a function to have a dynamic table name
-    class Message(DynamicBase):
+    # Model declared inside a function to have a dynamic table name.
+    class Message(DynamicBase):  # type: ignore[valid-type, misc]
         __tablename__ = table_name
         id = Column(Integer, primary_key=True)
         session_id = Column(Text)

libs/community/langchain_community/chat_message_histories/tidb.py

@@ -40,7 +40,7 @@ class TiDBChatMessageHistory(BaseChatMessageHistory):
         self.session_id = session_id
         self.table_name = table_name
         self.earliest_time = earliest_time
-        self.cache = []  # type: ignore[var-annotated]
+        self.cache: List = []
 
         # Set up SQLAlchemy engine and session
         self.engine = create_engine(connection_string)