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

[Mark Proctor]

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
>