extensions/forms.py

@@ -64,19 +64,12 @@ class AddPreviewFileForm(files.forms.BaseMediaFileForm):
         """Save Preview from the cleaned form data."""
         instance = super().save(*args, **kwargs)
 
-        # Create extension preview and save caption to it
-        extensions.models.Preview.objects.bulk_create(
-            [
-                extensions.models.Preview(
+        # Create extension preview and save caption to it, ignore duplicate records
+        extensions.models.Preview.objects.get_or_create(
             file=instance,
-                    caption=self.cleaned_data['caption'],
             extension=self.extension,
+            defaults={'caption': self.cleaned_data['caption']},
         )
-            ],
-            ignore_conflicts=True,
-            update_conflicts=False,
-        )
-
         return instance