Re: [rules-users] Using global in LHS
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
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