[rules-users] Loop Drools on Multi Element

[laune]

Using forall isn't so complicated. You can use the simplified form, where
the
condition to be satisfied is written in the pattern selecting the domain.

rule setPriority
when
    $order: OrderType( priority != "high" )
    forall ( OrderLineType( quantity > 2 ) from $order.lineItem )
then
    modify( $order ){ setPriority( "high" ) }
    System.out.println( "set to high" );
end



This illustrates very nicely the duality (by de Morgan's laws) between
forall and negated existence.


As for efficiency: repeated evaluation of large lists where the elements
aren't facts /may/
slow you down - whether this is a problem depends on other factors.
 

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