[rules-users] Using global in LHS

[Jaroslaw Kijanowski]

Markus Helbig wrote:
> Hi,
> 
> also using memberOf results in: Unable to create Field Extractor for
> 'advertisment' of '[ClassObjectType
> 
> do i'll miss sth else?

Yes, I guess so  ;)
Now you are using
is of type Advertisment=advertisment memberOf catId
right?
As I said before the let side of "contains", "memberOf, etc must be a 
field. catId is a field, advertisment is a global.
To have it fixed try
is of type Advertisment=catId memberOF advertisment

Cheers,
  Jarek


> 
> Cheers
> 
> Markus
> 
> On Thu, May 29, 2008 at 2:48 PM, Jaroslaw Kijanowski
> <jaroslaw.kijanowski at redhat.com> wrote:
>> 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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>>> rules-users at lists.jboss.org
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