create and save autotiles from air quality dynamic paage (#26982)

combo_plugin_gnm/templatetags/gnm.py

@@ -29,6 +29,7 @@ from requests import RequestException
 from django import template
 from django.conf import settings
 from django.core.serializers.json import DjangoJSONEncoder
+from django.core import signing
 from django.utils.dateparse import parse_datetime
 from django.utils.http import quote
 from django.utils.html import format_html
@@ -663,3 +664,21 @@ def indice_values(indices):
     for key in ('indice_j-1', 'indice_j', 'indice_j+1'):
         if indices.get(key):
             yield indices.get(key)
+
+@register.filter
+def airquality_hack(cell, request):
+    if cell.key == 'airquality' and not cell.parameters:
+        # Cell on airquality dynamic page, it has empty cell.parameters as it
+        # gets those from the query string.  In order to get un/favorite link
+        # to work we need to duplicate the cell into a concrete object with a
+        # copy of query parameters within.
+        if request.GET.get('ctx'):
+            ctx = signing.loads(request.GET['ctx'])
+            lon, lat = ctx['q_lon'], ctx['q_lat']
+        else:
+            lon, lat = request.path.split('/')[-2].split(',')
+        cell.parameters = {'lon': lon, 'lat': lat}
+        cell.placeholder = '_auto_tile'
+        cell.id = None
+        cell.save()
+    return cell