Drools rule iterate collections and verify property

Question

With Drools Rules "mvel" how to iterate over a collection and verify a property for each object in the collection?

score 6 · Accepted Answer · answered Feb 25 '11 at 12:33

6

Look for the forall keyword in the reference manual (follow documentation on the drools page).

answered Feb 25 '11 at 12:33

Geoffrey De Smet

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score 4 · Answer 2 · answered Oct 21 '11 at 22:37

4

Here's the code for going over the collection of Interests inside a Person object and checking if one of them is contains an interestName field "Running":

rule "likes running?"
    when
        $p : Person()
        $inter : Interest ( interestName == "Running" ) from $p.interests
    then
        System.out.println("I like running too.");
end

answered Oct 21 '11 at 22:37

Val Schuman

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Am I able to use $inter variable in RHS? I have problem with this in Guided Table Editor. – Patryk Dobrowolski Dec 19 '13 at 12:18
@PatrykDobrowolski yes – K.C. Mar 20 '14 at 12:42

Drools rule iterate collections and verify property

2 Answers2