On 17 July 2013 21:18, Jonathan Slenders <[email protected]>wrote:

> This is really nice. Both have their use cases, but I'm prefering the
> second when possible, because it's much more flexible and preserves
> database consistency.
> With the same efford you can make the following work:
>
> ProductEntry.objects.filter(lambda p: p.onpurchase_price * p.quantity
> == 5000.0)
>
> Or if you don't like the lambda keyword, extend the Q object. Something
> like this:
>
> ProductEntry.objects.filter(Q(onpurchase_price) * Q(quantity) == 5000.0)
>
>
ISTM it would be more of an extension of ExpressionNode, like F().

--
Curtis

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