[rules-users] null checking

[samd]

samd 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.
> 
> 

should be cheese: ( type == "chedder" ) from seller.cheese

anyways I tried doing this

(
 seller: ( seller.cheese != null && seller.active == true ) 
 cheese: ( cheese.type == "chedder" ) from seller.cheese
)
or
(
  seller: ( seller.cheese = null && seller.active == true ) 
)
Which throws an error
I just need the correct syntax I guess heh

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