Update app.py

app.py

@@ -20,6 +20,9 @@ weaviate_url = os.getenv('WEAVIATE_URL')
 # Weaviate connection
 auth_config = weaviate.auth.AuthApiKey(api_key=weaviate_api_key)
 client = weaviate.Client(url=weaviate_url, auth_client_secret=auth_config, additional_headers={"X-Cohere-Api-Key": cohere_api_key})
+
+# Initialize vectorstore
+vectorstore = Weaviate(client, index_name="Articles", text_key="text")
 vectorstore._query_attrs = ["text", "title", "url", "views", "lang", "_additional {distance}"]
 vectorstore.embedding = CohereEmbeddings(model="embed-multilingual-v2.0", cohere_api_key=cohere_api_key)