Index: openacs-4/packages/acs-kernel/sql/postgresql/acs-relationships-create.sql
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-kernel/sql/postgresql/acs-relationships-create.sql,v
diff -u -r1.10 -r1.11
--- openacs-4/packages/acs-kernel/sql/postgresql/acs-relationships-create.sql	9 Dec 2001 04:21:58 -0000	1.10
+++ openacs-4/packages/acs-kernel/sql/postgresql/acs-relationships-create.sql	9 Dec 2001 04:49:30 -0000	1.11
@@ -363,8 +363,11 @@
   actual_object_type_two acs_object_types.object_type%TYPE;
 begin
 
-    -- DRB: The obvious rewrite using exists kills Postgres!!!  Argh!!!  This is faster, so there ...
-    -- Get all the object type
+    -- DRB: The obvious rewrite to use Dan''s port of this to use tree_ancestor_keys kills
+    -- Postgres!!!  Argh!!!  This is fast, to, so there ...
+
+    -- Get all the object type info from the relationship.
+
     select rt.object_type_one, rt.object_type_two,
            o1.object_type, o2.object_type
     into target_object_type_one, target_object_type_two,
@@ -374,17 +377,19 @@
       and o1.object_id = new.object_id_one
       and o2.object_id = new.object_id_two;
 
-    select count(*) into dummy
-    from (select tree_ancestor_keys(acs_object_type_get_tree_sortkey(actual_object_type_one)) as tree_sortkey) parents1,
-      (select tree_ancestor_keys(acs_object_type_get_tree_sortkey(actual_object_type_two)) as tree_sortkey) parents2,
-      (select tree_sortkey from acs_object_types where object_type = target_object_type_one) root1,
-      (select tree_sortkey from acs_object_types where object_type = target_object_type_two) root2
-    where tree_ancestor_p(root1.tree_sortkey, parents1.tree_sortkey)
-      and tree_ancestor_p(root2.tree_sortkey, parents2.tree_sortkey);
+    if not exists (select 1
+                    from 
+                    (select tree_ancestor_keys(acs_object_type_get_tree_sortkey(actual_object_type_one))
+                      as tree_sortkey) parents1,
+                    (select tree_ancestor_keys(acs_object_type_get_tree_sortkey(actual_object_type_two))
+                      as tree_sortkey) parents2,
+                    (select tree_sortkey from acs_object_types where object_type = target_object_type_one)
+                      root1,
+                    (select tree_sortkey from acs_object_types where object_type = target_object_type_two)
+                      root2
+                   where root1.tree_sortkey = parents1.tree_sortkey
+                     and root2.tree_sortkey = parents2.tree_sortkey) then
 
-    if NOT FOUND then
-
-
       raise EXCEPTION ''-20001: %  violation: Invalid object types. Object % (%) must be of type % Object % (%) must be of type %'', new.rel_type, 
                                          new.object_id_one,
                                          actual_object_type_one,