Hi All, I''m trying to set up a region tree, and when I unit test the class, the fixure does not seem to load ''in order'', and as a result i get the following error: test_traverse(RegionTest): ActiveRecord::StatementInvalid: ERROR C23503 Minsert or update on table "region" violates foreign key constraint "fk_region_parent" DKey (parent_id)=(4) is not present in table "region". Fri_triggers.c L3290 Rri_ReportViolation: INSERT INTO region ("name", "country_id", "id", "parent_id") VALUES (''West End'', 1, 5, 4) ''test_traverse'' is empty test, and the rest of the test just has the appropriate fixture(s) to load. The region.rb file looks like this: class Region < ActiveRecord::Base acts_as_tree :order => "name" end The fixture looks like this: sydney_region: id: 1 name: Sydney country_id: 1 haymarket_region: id: 2 name: Haymarket country_id: 1 parent_id: 1 rocks_region: id: 3 name: The Rocks country_id: 1 parent_id: 1 brisbane_region: id: 4 name: Brisbane country_id: 1 westend_region: id: 5 name: West End country_id: 1 parent_id: 4 and the table def looks like this: create table region ( id serial not null, country_id int not null, parent_id int null, name varchar(50) not null, constraint pk_region primary key (id) ); create unique index idx_region_candidatekey on region(country_id, name); -- edit: removed country FK create index idx_region_parent on region(parent_id); alter table region add constraint fk_region_parent foreign key (parent_id) references region(id) ; Of course, if I remove the ''fk_region_parent'' constraint, everything is peachy, but I''d rather skip that if possible. I also tried commenting out the fixture with id 5 (that is referenced in the error) and the error just changed to refer to the one with id 2. Anyone got any ideas? Cheers, Dan