Which error are you seeing now? Try making this change and let us know what the
results are.
cart_obj, new_obj = Cart.objects.get(user=request.user)
if product_obj in cart_obj.products.all():
cart_obj.products.remove(product_obj)
added = False
Context:
http://www.learningaboutelectronics.com/Articles/How-to-check-if-an-object-is-in-a-ManyToManyField-in-Django.php
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