[rules-users] Globals in LHS of a rule?

[Mark Proctor]

Darko IVANCAN wrote:
> Hmm,
>
> Right.
> Size is not a property (getSize), thus (size==2) does not work.
>
> I'm not sure,but  myList(size()==2) could work though.
>   
you would have to do List() from myList, otherwise it assumes its 
reasoning over data asserted into the working memory - hmm I assume that 
works, never tried, as I'm not sure its a valid use case - just assert 
the object. You can use globals freely in field constraints. Remember 
the engine has no idea when globals change, so if they are used in the 
LHS they should be considered immutable.
> Does it ?
>
> darko
>
>
> On 27/11/2007 15:09, Michael Zimmermann wrote:
>   
>> Hi Darko,
>>
>>   
>>     
>>> Global java.util.List myList
>>>
>>> rule "SomeOtherRule"
>>> when
>>>     myList(size==2);
>>> then
>>> ...
>>> end
>>>     
>>>       
>> Sorry, won't work. Unable to resolve object type 'diameters'. What works
>> though is:
>>
>> rule "abc"
>> when
>>  eval (diameters.size() == 2)
>> then
>>  ...
>> end
>>
>> cu, Michael
>>
>>
>>
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>>
>>   
>>     
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