bugfixes and more comments

core/views/logbooks.py

@@ -3,6 +3,7 @@ import re
 from django.db.models import Q
 from django.shortcuts import redirect, render
 from django.views.generic.list import ListView
+from django.core.exceptions import ValidationError
 
 import troggle.settings as settings
 from troggle.core.models.logbooks import QM, LogbookEntry, PersonLogEntry, writelogbook
@@ -307,8 +308,17 @@ def logreport(request, year=1999):
         return render(request, "errors/generic.html", {"message": msg})
 
 def logbookentry(request, date, slug):
-    # start = time.time()
-    trips = LogbookEntry.objects.filter(date=date)  # all the trips not just this one
+    """Displays a single logbook entry
+    however, if an author has not used the correct URL in an image or a reference, then a link from
+    inside a logbook entry can arrive with this default address prefix. So we
+    have to handle that error without crashing.
+    """
+    try:
+        trips = LogbookEntry.objects.filter(date=date)  # all the trips not just this one
+    except ValidationError:
+        msg = f' Logbook entry invalid date:"{date}" probably because of relative (not absolute) addressing of "src=" or "haref=" in the text'
+        print(msg)
+        return render(request, "errors/generic.html", {"message": msg})
     this_logbookentry = trips.filter(date=date, slug=slug)
     year = slug[:4]