Re: html response before saving object

database save is not async.

a few possibilities:

- does the product exist?

- is the cart_item really not created? (or is the cart the thing not being created?)

- is the prefetch_related pre-caching the related cart items, so in the template it doesn't see the new item? (hint: redirect to the same page to load the page again)

- are you using transactions?

- you could moving around some print statements, or my favorite: assert False, to see what code is actually getting run.

also, while you're upgrading (or after), you can now use simpler code for that last line:

return render(request, 'products/cart.html', response_args)

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