Fix MongoDB implementation

src/ctp_slack_bot/db/mongo_db.py

@@ -51,24 +51,25 @@ class MongoDB(BaseModel):
             logger.error("Failed to initialize MongoDB client: {}", e)
             self._client = None
             self._db = None
+            raise
     
     @property
     def client(self: Self) -> AsyncIOMotorClient:
         """Get the MongoDB client instance."""
-        if not self._client:
+        if self._client is None:
             logger.warning("MongoDB client not initialized. Attempting to initialize.")
             self._initialize_client()
-            if not self._client:
+            if self._client is None:
                 raise ConnectionError("Failed to initialize MongoDB client")
         return self._client
     
     @property
     def db(self: Self) -> Any:
         """Get the MongoDB database instance."""
-        if not self._db:
+        if self._db is None:
             logger.warning("MongoDB database not initialized. Attempting to initialize client.")
             self._initialize_client()
-            if not self._db:
+            if self._db is None:
                 raise ConnectionError("Failed to initialize MongoDB database")
         return self._db
     

src/ctp_slack_bot/db/repositories/mongo_db_vectorized_chunk_repository.py

@@ -11,7 +11,7 @@ class MongoVectorizedChunkRepository(VectorizedChunkRepository):
     
     def __init__(self, mongo_db: MongoDB):
         self.mongo_db = mongo_db
-        self.collection = self.mongo_db.client.get_database().get_collection("vectorized_chunks")
+        self.collection = self.mongo_db.db.get_collection("vectorized_chunks")
         
         # Create indexes for efficient queries
         self.collection.create_index("chunk_id")