[rules-users] Inserting (asserting) objects during LHS evaluation - side effects?

[Mark Proctor]

no you can't do this.

Mark
Lance Arlaus wrote:
> All-
>
> What are the potential side effects of asserting objects during LHS
> evaluation, specifically a FROM clause?
>
> For example, using the example from the docs, let's assume that the
> zipcode property is in fact a field that's calculated via business
> rules.  So, I'd like to perform just-in-time insertion of the person's
> address and perhaps other objects as well necessary to the calculation.
>
> In other words, I'd like to implicitly assert objects on-demand as
> they're needed.  For the curious, this is something that's possible in
> Blaze Advisor using their is-needed rules, and for which I'm attempting
> to find a corresponding capability in Drools.
>
> I guess it comes down to the question of whether insertObject() is
> reentrant.  Anybody have a clue?  Or another way of approaching this?
>
> For reference, here's the documentation example using the from clause:
>
> rule "validate zipcode"
> when
>     Person( $personAddress : address ) 
>     Address( zipcode == "23920W") from $personAddress 
> then
>     # zip code is ok
> end
>
>
>
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