Merge pull request 'Fix image upload bugs' (#10) from dev into main

Reviewed-on: #10

pflaenzli/pflaenzli/models.py

@@ -52,9 +52,12 @@ def auto_delete_image_on_delete(sender, instance, **kwargs):
 
 @receiver(models.signals.pre_save, sender=Offer)
 def delete_old_image(sender, instance, **kwargs):
+    if instance.pk:
         try:
             old_image = sender.objects.get(pk=instance.pk).image
         except sender.DoesNotExist:
             return False
 
+        new_image = instance.image
+        if old_image != new_image:
             default_storage.delete(old_image.path)

pflaenzli/pflaenzli/views.py

@@ -87,7 +87,10 @@ def offer_edit(request, offer_id):
         form = CreateOfferForm(request.POST, request.FILES, instance=offer)
         if form.is_valid():
             offer = form.save(commit=False)
+            if 'image' in request.FILES:
                 offer.image.name = generate_unique_filename(form.cleaned_data['image'].name)
+            else:
+                offer.image = offer.image
             offer.user = request.user
             offer.save()
             messages.success(request, _("Offer updated successfully!"))