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