[rules-users] having trouble using accumulate to create a list of non null objects

[burmanator]

I have 2 objects, Foo and Bar. Foo can store an instance of Bar. I am trying
to create a list of all the Bar objects that correspond to all the Foo
objects with a given name.

the line in my rule I am using is: 

Foo($name : Name)

$list : List() from accumulate( Foo( Name == $name, $b : Bar != null),
collectList($b))

Yet when I print out the list, it includes null elements. But if I instead
make the rule: 

$list : List() from accumulate( Foo( Name == $name, $b : Bar != null),
collectList($b!=null))

I get false for all the null Bar objects.

Am I missing something?



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