add folium marker cluster to route /geolocalisation

app/routes.py

@@ -24,6 +24,7 @@ from collections import defaultdict
 
 from flask import Blueprint, render_template, request, url_for, redirect
 import folium
+from folium.plugins import MarkerCluster
 from pymongo import ASCENDING
 
 
@@ -191,6 +192,8 @@ def geolocalisation():
                                actes=plaintext_response(search, actecol, prince_bigram))
 
     m = folium.Map(location=[46.603354, 1.888334], zoom_start=6)
+    marker_cluster = MarkerCluster().add_to(m)
+
     markers = defaultdict(list)
 
     for result in actecol.find():
@@ -208,7 +211,7 @@ def geolocalisation():
         latitude = value[0][1]
         longitude = value[0][2]
         urls = [(url[0], url[3]) for url in value]
-        #print("urls", urls)
+        # print("urls", urls)
         popup = [f"{name}<br/>"]
         for location, see in urls:
             popup.append(f"<a href='{location}' target='_top'>{see}</a><br/>")
@@ -216,9 +219,10 @@ def geolocalisation():
         if latitude is not None:
             folium.Marker(
                 location=[latitude, longitude],
-                popup= popup,
+                popup=popup,
                 icon=folium.Icon(color='lightgray', icon="circle", prefix='fa')
-            ).add_to(m)
+            ).add_to(marker_cluster)
+            # to remove marker_cluster : .add_to(m)
 
     geolocalisation = m._repr_html_()
     return render_template("map.html", geolocalisation=geolocalisation)