My generic routine looks like this:
def update_linked_poly_side(base_side, ids, poly_side) # get back the current linked items, and the base part # of the polymorphic field names, like 'appllinkable' linked, poly_base = self.polymorphic_info base_side id_attr = base_side+'_id' linked.each do |link| linked_model_id = (link.send id_attr).to_s link.destroy unless ids.include(linked_model_id) ids.delete(linked_model_id) end ids.each do |id| linked.create(blah blah blah - create works fine) end end
The link.destroy works fine for the first link that is currently linked but isn't in the ids list, but it doesn't work for any subsequent links that should also be destroyed.
Runtime logging (not in the code above for clarity) reports: at entry, 3 appllink objects, ids ["3", "1", "2"] in linked (correct) poly_base = 'applinkable' (correct) ids = ["", "2"] in the linked.each do |link| loop it looks for "3" in ids, doesn't find it and logs: SQL (0.000694) BEGIN Appllink Destroy (0.000345) DELETE FROM 'appllinks' WHERE 'id' = 9 SQL (0.001159) COMMIT
then it looks for "1" in ids, doesn't find it and logs: SQL (0.000138) BEGIN SQL (0.000137) COMMIT
There isn't an issue with the first linked item that is to be deleted, but there isn't a SQL statement generated for any subsequent items that should be removed... adding new linked items works just fine (that's in the ids.each do |id| loop).
Any ideas? Anyone? Oh, and Rails 2.1.0, Ubuntu 8.04, Ruby 1.8.6