Re: [rules-users] creating a rule regarding an element of list stored in an object in a list

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&gt; 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&gt;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&gt; 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. > > _______________________________________________ > > rules-users mailing list > > rules-users(a)lists.jboss.org > > https://lists.jboss.org/mailman/listinfo/rules-users > > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > -- Sincerely, Alex Burman cell: 908-672-0198 _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users