[rules-users] Using global in LHS

[Jaroslaw Kijanowski]

Hi,
  there are two issues:
- the left side of contains needs to be filed of Item (it also needs to 
be a Collection or array)
- in your case you should use "memberOf" to check if a field (catId) is 
a member of a Collection or array.

see the docs for more info (6.5.2.1.1.3.1. Operators)

However if you're going to use an array as your global, you will run 
into a CCE, because an array doesn't implement the Collection interface 
[1], [2].
I'm not sure if this is a bug in drools or an expected "constraint", 
hence a bug in the docs.
Anyway, your safe using a List.

Cheers,
  Jarek

[1] 
drools-core/src/main/java/org/drools/base/evaluators/BaseMemberOfEvaluator.java 
(evaluate())
[2] drools-core/src/main/java/org/drools/spi/FieldValue.java


Markus Helbig wrote:
> Hi,
> 
> again a question, any body had success using globals in LHS?
> 
> Following DSL
> 
> [condition][]is a Item=Item()
> [condition][]-is of type Advertisment=advertisment contains catId
> 
> 
> rule
>          when
>                 $pli: is a Item
>                     - is of type Advertisment
>          then
>                 // do whatever you want
> end
> 
> catId is a member of Item
> advertisment is a Integer[] array set as global
> 
> comiling ends with:
> 
> Unable to create Field Extractor for 'advertisment' of '[ClassObjectType
> 
> It works fine if advertisment is a member of Item, but i want to have
> it as global ...
> 
> Cheers
> 
> Markus
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users