Update app.py

app.py

@@ -27,7 +27,7 @@ def load_chunks_and_embeddings():
         api_key="0291f33aee03412a47fa5d8e562e515182dcc5d9aac5a7fb5eefdd1759005979"
     )
     
-    vectorstore = FAISS.from_documents([], embedding=embeddings)  # اول خالی
+    vectorstore = None  # هنوز نساختیم
 
     # پروگرس بار
     progress = st.progress(0, text="🔄 در حال پردازش چانک‌ها...")
@@ -37,7 +37,11 @@ def load_chunks_and_embeddings():
     for i in range(0, total, batch_size):
         batch_docs = docs[i:i+batch_size]
         embeddings_batch = embeddings.embed_documents([doc.page_content for doc in batch_docs])
-        vectorstore.add_embeddings(embeddings_batch, batch_docs)
+
+        if vectorstore is None:
+            vectorstore = FAISS.from_embeddings(embeddings_batch, batch_docs)
+        else:
+            vectorstore.add_embeddings(embeddings_batch, batch_docs)
 
         progress.progress(min((i+batch_size)/total, 1.0))