I have a rule similar to this:
CREATE RULE rule_branch_delete AS ON DELETE TO tree DO DELETE FROM tree WHERE ancestor_id IS NOT NULL AND OLD.child_id = ancestor_id;
The data is oraganized like this:
ancestor_id child_id ================================ NULL 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 2 4 2 5 2 6 3 7 3 8 etc.
This is an optimization table that relates all nodes in a branch to all it's ancestor nodes; to it's parent, to it's grand parent to it's grand grand parent, etc.
The tree is 3 to 5 levels deep. The intention is to delete all children of a branch that share the same ancestor when an ancestor gets deleted. This happens recursively, of course.
If I try a delete on the tree table I get "Infinite recursion detected on rules on tree". I'm pretty sure it's not "infinite" in my case, how can I make it delete the records regardless this "infinity"?
At the moment I use a trigger, but I would prefer a rule.
Alban.
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