这是我正在使用的spec_helper：

require 'active_record'
require 'active_record/fixtures'
require 'active_support'
require 'rspec/rails/extensions/active_record/base'
require 'rspec/rails/adapters'
require 'rspec/rails/fixture_support'  # Includes ActiveRecord::TestFixtures
                                       # into the RSpec config

require 'my_models'

# Setup database connection
environment = "test"
configuration = YAML::load(File.open('config/database.yml'))
ActiveRecord::Base.establish_connection(configuration[environment])

RSpec.configure do |config|
  config.fixture_path = File.expand_path("../../test/fixtures",__FILE__)

  # If you're not using ActiveRecord,or you'd prefer not to run each of your
  # examples within a transaction,remove the following line or assign false
  # instead of true.
  config.use_transactional_fixtures = true

  # Run specs in random order to surface order dependencies. If you find an
  # order dependency and want to debug it,you can fix the order by providing
  # the seed,which is printed after each run.
  #     --seed 1234
  config.order = "random"

  # Run each test inside a DB transaction
  config.around(:each) do |test|
    ActiveRecord::Base.transaction do
      test.run
      raise ActiveRecord::Rollback
    end
  end
end

这是一个测试的例子

require 'spec_helper'

describe Transaction do

  before :each do
    self.class.fixtures :users,:merchants
  end

  it "should do this and that" do
    ...
  end
end

问题是,这样,夹具没有加载.我查看了rspec-rails代码,但无法弄清楚我应该扩展哪个模块或我应该调用的方法.