Intercept NoReverseMatch eceptions more helpfully

core/views/caves.py

@@ -12,6 +12,7 @@ from django.urls import reverse
 from django.http import HttpResponse, HttpResponseRedirect, HttpResponseNotFound
 from django.shortcuts import get_object_or_404, render
 from django.core.exceptions import ObjectDoesNotExist, MultipleObjectsReturned
+from django.urls import NoReverseMatch
 
 import troggle.settings as settings
 from troggle.core.views import expo
@@ -235,11 +236,13 @@ def rendercave(request, cave, slug, cave_id=''):
             editable = False              
         if not cave_id:
             cave_id = slug # cave.unofficial_number
-        try:
-            context = {'cave_editable': editable, 'settings': settings, 'cave': cave, 'cavepage': True, 
+        context = {'cave_editable': editable, 'settings': settings, 'cave': cave, 'cavepage': True, 
                 'cave_id': cave_id, 'svxstem': str(svxstem), 'svx3d':svx3d}
-            r = render(request, templatefile, context) # crashes here if url not set up for 'edit_cave' in urls.py
+        try:
+            r = render(request, templatefile, context) # crashes here with NoReverseMatch if url not set up for 'edit_cave' in urls.py
             return r
+        except NoReverseMatch:
+            raise
         except:
             message = f'Failed to render cave: {slug}'
             return render(request,'errors/generic.html', {'message': message})
@@ -259,9 +262,9 @@ def cavepage(request, karea, subpath):
     kpath = karea + subpath
     # print(f" ! cavepage:'{kpath}' kataster area:'{karea}' rest of path:'{subpath}'")
     
+    cave = Cave.objects.get(url = kpath) # ideally this will be unique
+    print(f" ! cavepage: url={kpath} -- {cave}")
     try:
-        cave = Cave.objects.get(url = kpath) # ideally this will be unique
-        # print(f" ! cavepage: url={kpath} -- {cave}")
         r = rendercave(request, cave, cave.slug())
         return r
 
@@ -273,8 +276,10 @@ def cavepage(request, karea, subpath):
         caves = Cave.objects.filter(url = kpath) 
         # we should have a -several variant for the cave pages, not just the svxcaves:
         return render(request, 'svxcaveseveral.html', {'settings': settings, "caves":caves })
+    except NoReverseMatch:
+        raise
     except:
-        message = f'Failed to find cave: {kpath}'
+        message = f'Failed to render cave: {kpath} (it does exist and is unique) because of a Django URL resolution error. Check urls.py.'
         return render(request,'errors/generic.html', {'message': message})
         
     return rendercave(request, cave, cave.slug(), cave_id=cave_id)