Update rag.py

app/rag.py

@@ -107,9 +107,9 @@ class ChatPDF:
         return streaming_response
 
     def clear(self):
-        for id in self.doc_ids:
-            self.vector_store.delete(id)
-        self.pdf_count = 0
-        self.text_chunks = []
-        self.doc_ids = []
-        self.nodes = []
+        if self.nodes:
+            self.vector_store.delete_nodes(self.nodes)
+            self.pdf_count = 0
+            self.text_chunks = []
+            self.doc_ids = []
+            self.nodes = []