Sequential ID's for ActiveRecord Fixtures. For using fixtures in db/seeds.rb

seeds.rb

# Open and override ActiveRecord::FixtureSet with new identify method implementation to support sequentual ID's
module ActiveRecord
  class FixtureSet
    @@seq_id = 0
    @@seq_keys = {}
    def self.identify(label)
      @@seq_keys[label] ||= begin
        @@seq_id += 1
        @@seq_id
      end
      @@seq_keys[label]
    end
  end
end

#ActiveRecord::Fixtures.create_fixtures("#{Rails.root}/test/fixtures", ["users"])