[rules-users] Question about Drools accessing a global HashMap and comparing it to an object value

[Greg Barton]

Not a bug in drools, but a bug in my brain.  :) The first term in a condition element must come from the object, and objCode was bound in the previous object.  I didn't test that rule before posting, so my bad.

GreG

On Jan 27, 2011, at 15:15, mviens <mike at viens.com> wrote:

> 
> Hi Greg,
> 
> Thank you for the reply.  I converted the rules back to being processed in
> singular mode versus through an ArrayList as you recommended.  I am curious
> about the reason though -- is it a performance issue or does it just make it
> more difficult to work with within the rule?
> 
> I tried your recommendation of the rule, but it caused an error:
> 
> rule "Check for valid code"
>    when
>        obj : MyObj(objState : state, objCode : code)
>        codes : State2Code(state == objState && objCode not memberOf codes)
>    then
>        obj.addError("Code is not valid for the State");
> end
> 
> BuildError: Unable to create Field Extractor for 'objCode' of
> '[ClassObjectType class=com.abc.xyz.StateFips]' in rule 'Check for valid
> Code'
> 
> 
> When I changed the rule to this, the error is gone and it worked just fine.
> 
> rule "Check for valid code"
>    when
>        obj : MyObj(objState : state, objCode : code)
>        codes : State2Code(state == objState && codes not contains objCode)
>    then
>        obj.addError("Code is not valid for the State");
> end
> 
> Do you have any thoughts on why the first rule does not work but the second
> one does?  Is it a bug?  The only difference between the rule I have and the
> one you suggested was using a comma versus ==.  I tried with the comma, but
> the error remained.  I am using Drools 5.1.1.
> 
> Mike V.
> -- 
> View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Question-about-Drools-accessing-a-global-HashMap-and-comparing-it-to-an-object-value-tp2334346p2364040.html
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