Here's how I'd address this issue. I haven't compiled or run this but I
hope it communicates the idea.
rule "Every mother and father produce a child"
no-loop
when
$mother : Mother( )
$father : Father( )
not Child( mother = $mother, father = $father )
then
Child child = new Child($mother.getId() + "-" +
$father.getId());
child.setMother($mother);
child.setFather($father);
insertLogical( child );
end
rule "Every child gets his/her father's first and last name"
no-loop
when
$father : Father( $first: first, $last: last )
$child : Child( father == $father,
first != $first,
last != last )
then
$child.setFirst($first);
$child.setLast($last);
update($child);
end
rule "Every child gets his/her mother's middle name"
no-loop
when
$mother : Mother( $middle: middle )
$child : Child( mother == $mother,
middle != middle )
then
$child.setMiddle($middle);
update($child);
end
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