[rules-users] can't refer to the bound column fields from the LHS?..

[Edson Tirelli]

Vlad,

Not yet. We may eventually support that in the future through MVEL 
integration, but right now you can't do it. You can though use a return 
value predicate for that though:

Rule xxx

When

$r1: MyRecord (field1 == “xxx”)

$r2: MyRecord2 (field1 == ( $r1.getField1() ))

Then

System.out.println(“found match: “+$r2+”, “+$r1);

End


I know it was just an illustration example, but always good to 
reinforce: for the above case, the best would be to bind the attribute 
itself, not the fact:

Rule xxx

When

$r1: MyRecord ( $f1 : field1 == “xxx”)

$r2: MyRecord2 ( field1 == $f1 )

Then

System.out.println(“found match: “+$r2+”, “+$r1);

End


[]s
Edson


Olenin, Vladimir (MOH) wrote:

> Hi,
>
> I always assumed that one can refer to the properties of the bound 
> column in the LHS like this:
>
> MyRecord {
>
> String field1, field2;
>
> }
>
> MyRecord2 {
>
> String field1, field3;
>
> }
>
> Rule xxx
>
> When
>
> $r1: MyRecord (field1 == “xxx”)
>
> $r2: MyRecord2 (field1 == $r1.field1)
>
> Then
>
> System.out.println(“found match: “+$r2+”, “+$r1);
>
> End
>
> Compiler does complain on ‘$r1’ usage in the LHS (as part of 
> constraint for MyRecord2 fact), but works OK if used only in RHS. The 
> error I’m getting is: “Unable to find class $r1”. “$r1.getField1()” 
> doesn’t work either (getting “mismatched token, expecting ‘)’ “ error).
>
> Thanks,
>
> Vlad
>
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>
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-- 
 Edson Tirelli
 Software Engineer - JBoss Rules Core Developer
 Office: +55 11 3124-6000
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