Log when message has disappeared

trans/views.py

@@ -7,6 +7,9 @@ from django.contrib import messages
 
 from trans.models import Project, SubProject, Translation, Unit
 from trans.forms import TranslationForm
+import logging
+
+logger = logging.getLogger('weblate')
 
 def home(request):
     projects = Project.objects.all()
@@ -68,6 +71,7 @@ def translate(request, project, subproject, lang):
                 # Check and save
                 return HttpResponseRedirect('%s?type=%s&oldpos=%d' % (obj.get_translate_url(), rqtype, pos))
             except Unit.DoesNotExist:
+                logger.error('message %s disappeared!', form.cleaned_data['checksum'])
                 messages.add_message(request, messages.ERROR, _('Message you wanted to translate is no longer available!'))
 
     # If we failed to get unit above or on no POST