Look up "Conditional Element collect" in the manual. That provides example code
for getting a list of matching facts.
For more complex tasks, there's "accumulate".
Steve
On 11 Apr 2013, at 17:51, Alex Burman <alexburman(a)gmail.com> wrote:
Continuing with this same example, How can I count the number of
times a student has received an A across all the classes?
I can get it to trigger each time a student appears in the rosters of 2 different
teachers and that student has an A in both but I can't figure out how to track it
across more then that.
On Fri, Apr 5, 2013 at 4:50 AM, Stephen Masters <stephen.masters(a)me.com> wrote:
Just thought I'd mention that I hadn't replied to this, because it looks way too
much like comp-sci homework. Not sure whether that's the same reason others
haven't replied either. ;)
A hint though to get you started. You can probably use something like...
$student: Student(grade != null) from $roster
… with a few lines before that to pick out the roster in a similar fashion.
To understand it, check out the Drools Expert manual for the "from" operator
for working with lists/collections.
Steve
On 3 Apr 2013, at 19:59, burmanator <alexburman(a)gmail.com> wrote:
> So the example I am working with is this:
> You have a Teacher object
> that stores a list of Rosters objects
> in each Roster is a list of Students objects
> each Student has a grade value
>
> How would I go about creating a rule to find all the students that got As
> for a given Teacher across all her Rosters?
>
>
>
> --
> View this message in context:
http://drools.46999.n3.nabble.com/creating-a-rule-regarding-an-element-of...
> Sent from the Drools: User forum mailing list archive at
Nabble.com.
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Sincerely,
Alex Burman
cell: 908-672-0198
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