[rules-users] How to limit results from a collect statement

[pentarious]

I found an interesting implementation to do that. If anyone is interested I
could share my solution.

Regards,

CG


Mark Proctor wrote:
> 
> There is no supported way to do this. You could use an inline-eval 
> against a global, but that is very clunkey. However it does seem like a 
> good feature idea for a future release, open a jira and I'll look into 
> getting it included.
> 
> Mark
> pentarious wrote:
>> Does anyone know a method to limit the number of results from a collect
>> statement? I was just wondering how to do something like this:
>> $myList : List() from collect( MyObject(myField == "something") ) limit 3
>> //it should put in $myList just the first 3 objects retrieved
>> I'm quite sure there is nothing in Drools which can natively support
>> something like that. So, how to do that, if needed? I tried this, but it
>> seems not to be working (I can't understand why, though):
>> $myList : List() from collect( MyObject(myField == "something") )
>> $myObject : MyObject() from $myList
>> eval( $myList.indexOf($myObject) < 3 )
>> Indeed, it doesn't work because the link beetween $myList and $myObject
>> seems to be released during any execution of the rule (In fact
>> $myList.contains($myObject) returns false! Again, I can't understand
>> why...)
>>
>> Any advice would be really appreciated!
>>
>> Regards,
>>
>> CG
>>   
> 
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