keywords_string not working on Product model

[romecode]

Even though Product.keywords.all() will return assigned keywords, Product.keywords_string does not return the csv of keywords.

The problem lies here:
save_model is run first in the admin and the old version of Product instance is saved as self._product=obj
related_items_changed runs after for the KeywordField
then save_formset runs and saves the previous obj in self._product over the new

keywords_string are overwritten

fetching the Product in save_formset does indeed fix the issue, however, I am not sure if this is the best way to go about it
self._product=Product.objects.get(pk=self._product.pk)

[stephenmcd]

I've applied mostly the same fix you suggested in the linked Mezzanine issue.

Thanks for your help!