delete all documents button

app.py

@@ -27,21 +27,22 @@ def pdf_to_document_store(pdf_files):
     st.write(len(documents))
     preprocessed_docs = preprocessor.process(documents)
     document_store.write_documents(preprocessed_docs)
-    return None
 
 def summarize(files):
     pdf_to_document_store(files)
     summary = summarizer.predict(documents=document_store.get_all_documents(), generate_single_summary=True)
     st.write(summary)
-    
+
+
 uploaded_files = st.file_uploader("Choose PDF files", accept_multiple_files=True)
 
 if uploaded_files is not None:
     st.write(len(uploaded_files))
     if st.button('Summarize Documents'):
-        document_store.delete_documents()
         summarize(uploaded_files)
 
 if st.button('Calculate num of docs'):
     st.write(document_store.get_document_count())
 
+if st.button('Clear DocumentStore'):
+    document_store.delete_all_documents()