[rules-users] null checking

[David Sinclair]

I may be wrong, but that rule syntax looks off. Does it compile? This is
what I imagine u are trying to do

$seller : Seller(cheese != null and active == true)
             Cheese(type == "chedder") from $seller.cheese
On Thu, Oct 16, 2008 at 1:29 PM, samd <sdoyle_2 at yahoo.com> wrote:

>
> How do I evaluate null conditions in the following case for example?
>
> seller: ( seller.cheese != null && seller.active == true )
> cheese: ( cheese.type == "chedder" ) from seller.cheese
>
> In the above example seller.cheese is null but seller is used in the second
> part of the rule since we can't evaluate facts for null for some reason how
> do you check for a null condition.
>
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> http://www.nabble.com/null-checking-tp20015953p20015953.html
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