[rules-users] Some serious problems while authoring rules

[Mark Proctor]

you have two patterns, there for you need two objects - it's a cross 
product. Try using an eval instead of a predicate, then you can bind all 
your variables on the first line, and eval them on the next line.

Until you move to 4.0 there is no clean way to do this.

Mark
Natraj Gudla wrote:
> Yes, infact i expected both the conditions to work against the same 
> object in the working memory? Is it not possible?
> For this scenario, drools has not been allowing me to do a comparison 
> amongst two attributes of the same class. When i do so, it complains 
> of not being to resolve the variable.
> Some thing like a1 > a2 does not work. I am forced to create a 
> declaration and then use it to compare. If i do so, the run time thing 
> fails.
>  
> How do i get around to compare two attributes from the same class. 
> Something like
>  
> a1 > a2 or say a1 > (a2 * 1.5)
>  
> Thanks
> Natraj
>
>  
> On 7/19/07, *Mark Proctor* <mproctor at codehaus.org 
> <mailto:mproctor at codehaus.org>> wrote:
>
>     You do understand that what you have there is a cross product,
>     you'll need two objects to match against that - were you expecting
>     this to wokr against and on the same single EMIAgainstProperty
>     object?
>
>     Mark
>     Natraj Gudla wrote:
>>     I am facing some serious blocking issues while writing few rules.
>>     In the rule below, a1, a2 are Double objects. When i have the
>>     first statement in the rule " EMIAgainstProperty( obj : a1 )",
>>     the rule does not fire....when i comment and re phrase the second
>>     line as emi : EMIAgainstProperty( a2 >= ( *new* Double(10* 1.5 ))
>>     ), the rule is fired.
>>      
>>     Why is the first line making the rule not to fire. I have
>>     reported a similar problem yesterday, but could not find a
>>     resolution. On the other hand, i am unable to refer a1 directly
>>     to say a1.doubleValue () in the second line, it throws up and
>>     error. Any help??? What is the way out?
>>     *
>>
>>     rule
>>
>>     *"Test" *when*
>>
>>     EMIAgainstProperty( obj : a1 )
>>
>>     emi : EMIAgainstProperty( a2 >= (
>>
>>     *new* Double(obj.doubleValue() * 1.5 )) ) *then*
>>
>>     System.out.println(
>>
>>     " Passed ");*
>>
>>     end
>>
>>     *
>>     ------------------------------------------------------------------------
>>
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>>       
>
>      
>
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