[fix] Disconnect logic

Author: dee077

openwisp_controller/geo/channels/consumers.py

@@ -31,8 +31,12 @@ def join_groups(self, user):
             super().join_groups(user)
             return
 
-        self.group_names = []
+        self.group_name = []
         for org in user.organizations_managed:
             group = f"loci.mobile-location.organization.{org}"
-            self.group_names.append(group)
+            self.group_name.append(group)
             async_to_sync(self.channel_layer.group_add)(group, self.channel_name)
+
+    def disconnect(self, close_code):
+        for group in getattr(self, "group_name", []):
+            async_to_sync(self.channel_layer.group_discard)(group, self.channel_name)