Rails Ruby on Rails

Rails does not detect the primary key value of new saved objects when the primary key is not a sequence, and the value is generated by another default function.

                         Table "public.moo"
 Column |         Type          |              Modifiers
--------+-----------------------+-------------------------------------
 id     | uuid                  | not null default uuid_generate_v4()
 moo    | character varying(64) |
Indexes:
    "moo_pkey" PRIMARY KEY, btree (id)

This works perfectly when using the postgresql command line;

INSERT INTO moo(moo) VALUES('moo') RETURNING id;
                  id
--------------------------------------
 9a5374a9-0bf3-4196-b68b-e1dd6ab69f69
(1 row)

INSERT INTO moo(moo) VALUES('moo') RETURNING id;
                  id
--------------------------------------
 a107f5da-f013-4c15-83e8-fb0220fa3918
(1 row)

etc..

When using the framework the id isn't retrieved:

irb(main):006:0> blah = Moo.create(:moo => 'testing123')
=> #<Moo id: nil, moo: "testing123">

irb(main):007:0> Moo.find_by_moo('testing123')
=> #<Moo id: "c4c3ea70-61d9-4d4b-baae-aa6adde0b58b", moo: "testing123">

Tested with Rails 3.0.3 and PostgreSQL 8.3.12.