Update app.py

app.py

@@ -161,7 +161,7 @@ class PesticideDataFetcher:
                 # Correctly join the BASE_URL with the relative nextLink
                 url = urllib.parse.urljoin(self.BASE_URL, next_link)
                 params = None  # IMPORTANT: Don't send params again!
-                data = self.fetch_data(url)  # Fetch the next page of data
+                data = self.fetch_data(url)  # Fetch the next page of data.  NO PARAMS.
                 if not data:
                     break # Exit loop if data fetch fail
             else:
@@ -247,7 +247,7 @@ class PesticideDataFetcher:
             if next_link:
                 # Correctly join the BASE_URL with the relative nextLink
                 url = urllib.parse.urljoin(self.BASE_URL, next_link)
-                params = None  # IMPORTANT: Don't send params again!
+                params = None  # IMPORTANT: Don't send params again!  The nextLink ALREADY contains them.
             else:
                 url = None
             logger.info(f"Products retrieved so far: {products_loaded}")
@@ -568,9 +568,9 @@ class PesticideApp:
                 )
 
                 substance_results.select(  # Use .select() for interactive selection
-                    fn=lambda evt: evt.data[0] if evt.data else None,  # Extract ID
-                    inputs=substance_results,
-                    outputs=substance_select
+                        fn=lambda evt, data=substance_results: data.iloc[evt.index[0]]['ID'] if evt.index else None,
+                        inputs=[],
+                        outputs=substance_select
                 )