Nonstandard postgresql sequence names

I’m working with a legacy postgresql database where the names of tables,
columns, etc., do not usually follow Rails conventions.

I’ve been able to work around it for the most part, but I ran into this:
I have the following test:
require File.dirname(FILE) + ‘/…/test_helper’

class SponsorTest < Test::Unit::TestCase
self.use_transactional_fixtures = true
fixture :sponsors, :table_name => “sponsor”
fixture :eligibilities, :table_name => “topic_eligibility”

Replace this with your real tests.

def test_truth
assert_kind_of Sponsor, sponsors(:first)
end
end

(The “fixture” method comes from a patch that allows me to specify
non-standard table names–the table in this case is called sponsor, not
sponsors).

The sponsor table’s primary key column is called “sponsor_key” instead
of id, and instead of it being a serial type, it is just an integer. It
is incremented using a sequence named “sponsor_seq”.

I also have a sponsors.yml fixture with unremarkable contents.
When I try and run the test I get this:

Loaded suite test/unit/sponsor_test
Started
EWARNING: there is no transaction in progress
E
Finished in 0.831961 seconds.

  1. Error:
    test_truth(SponsorTest):
    ActiveRecord::StatementInvalid: PGError: ERROR: relation
    “sponsor_sponsor_key_seq” does not exist
    : SELECT setval(‘sponsor_sponsor_key_seq’, (SELECT
    COALESCE(MAX(sponsor_key), 0)+1 FROM sponsor), false)
    […]

It looks like the code in fixture.rb hardcodes an assumption about
sequence names. Any way that could be parameterized?