重新启动spork服务器后未定义的方法“instantiate_observers”错误

Question

我使用spork运行测试，没有问题，但是，有时我必须重新启动spork服务器，以使它识别新添加的路由。在这种情况下，我重新启动了spork服务器，每当我运行任何测试时，我都会收到以下错误消息：

Exception encountered: #<NoMethodError: undefined method `instantiate_observers' for ActiveRecord::Base:Class>
backtrace:
/Users/mydocs/.rvm/gems/ruby-2.0.0-p247@railstutorial_rails_4_0/gems/activerecord-4.0.0/lib/active_record/dynamic_matchers.rb:22:in `method_missing'
/Users/mydocs/Documents/rails_projects/sample_app_rails_4/spec/spec_helper.rb:56:in `block in <top (required)>'
/Users/mydocs/.rvm/gems/ruby-2.0.0-p247@railstutorial_rails_4_0/gems/spork-1.0.0rc3/lib/spork.rb:69:in `call'
/Users/mydocs/.rvm/gems/ruby-2.0.0-p247@railstutorial_rails_4_0/gems/spork-1.0.0rc3/lib/spork.rb:69:in `block in exec_each_run'
/Users/mydocs/.rvm/gems/ruby-2.0.0-p247@railstutorial_rails_4_0/gems/spork-1.0.0rc3/lib/spork.rb:69:in `each'
/Users/mydocs/.rvm/gems/ruby-2.0.0-p247@railstutorial_rails_4_0/gems/spork-1.0.0rc3/lib/spork.rb:69:in `exec_each_run'
/Users/mydocs/.rvm/gems/ruby-2.0.0-p247@railstutorial_rails_4_0/gems/spork-1.0.0rc3/lib/spork/run_strategy/forking.rb:12:in `block in run'
/Users/mydocs/.rvm/gems/ruby-2.0.0-p247@railstutorial_rails_4_0/gems/spork-1.0.0rc3/lib/spork/forker.rb:21:in `block in initialize'
/Users/mydocs/.rvm/gems/ruby-2.0.0-p247@railstutorial_rails_4_0/gems/spork-1.0.0rc3/lib/spork/forker.rb:18:in `fork'
/Users/mydocs/.rvm/gems/ruby-2.0.0-p247@railstutorial_rails_4_0/gems/spork-1.0.0rc3/lib/spork/forker.rb:18:in `initialize'
/Users/mydocs/.rvm/gems/ruby-2.0.0-p247@railstutorial_rails_4_0/gems/spork-1.0.0rc3/lib/spork/run_strategy/forking.rb:9:in `new'
/Users/mydocs/.rvm/gems/ruby-2.0.0-p247@railstutorial_rails_4_0/gems/spork-1.0.0rc3/lib/spork/run_strategy/forking.rb:9:in `run'
/Users/mydocs/.rvm/gems/ruby-2.0.0-p247@railstutorial_rails_4_0/gems/spork-1.0.0rc3/lib/spork/server.rb:48:in `run'
/Users/mydocs/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/drb/drb.rb:1588:in `perform_without_block'
/Users/mydocs/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/drb/drb.rb:1548:in `perform'
/Users/mydocs/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/drb/drb.rb:1626:in `block (2 levels) in main_loop'
/Users/mydocs/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/drb/drb.rb:1622:in `loop'
/Users/mydocs/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/drb/drb.rb:1622:in `block in main_loop'

spork服务器的其他重新启动没有更改任何内容。对于是什么原因造成的/如何解决它，有什么想法吗？谢谢

编辑:从spec_helper.rb添加代码

Spork.each_run do
  ActiveSupport::Dependencies.clear
  ActiveRecord::Base.instantiate_observers  <--- This is line 56

  load "#{Rails.root}/config/routes.rb"
  Dir["#{Rails.root}/app/**/*.rb"].each { |f| load f }  
end if Spork.using_spork?

添加了这个块，这样我就不再需要重新设置s猪肉服务器来让它识别路由的更改了，但是，我在今天早些时候做了这个更改，并成功地运行了许多测试。

Answer 1

观察者被从Rails 4中移除，试图实例化它们将无法工作。您所拥有的代码示例可能来自Rails 3。

把那条线移开。什么坏事都不会发生。