未定义的方法`announce'用于章节gem中的rails错误中的类`Class'(NameError)

Question

在我的应用程序中包含数据库分片宝石章鱼后,我得到以下错误...有人可以帮助我吗？.....

/usr/lib/ruby/gems/1.8/gems/activesupport-3.1.0/lib/active_support/core_ext/module/aliasing.rb:31:in `alias_method': undefined method `announce' for class `Class' (NameError)
    from /usr/lib/ruby/gems/1.8/gems/activesupport-3.1.0/lib/active_support/core_ext/module/aliasing.rb:31:in `alias_method_chain'
    from /usr/lib/ruby/gems/1.8/gems/ar-octopus-0.3.4/lib/octopus/migration.rb:9:in `extended'
    from /usr/lib/ruby/gems/1.8/gems/ar-octopus-0.3.4/lib/octopus/migration.rb:73:in `extend'
    from /usr/lib/ruby/gems/1.8/gems/ar-octopus-0.3.4/lib/octopus/migration.rb:73
    from /usr/lib/ruby/gems/1.8/gems/activesupport-3.1.0/lib/active_support/dependencies.rb:240:in `require'
    from /usr/lib/ruby/gems/1.8/gems/activesupport-3.1.0/lib/active_support/dependencies.rb:240:in `require'
    from /usr/lib/ruby/gems/1.8/gems/activesupport-3.1.0/lib/active_support/dependencies.rb:223:in `load_dependency'
    from /usr/lib/ruby/gems/1.8/gems/activesupport-3.1.0/lib/active_support/dependencies.rb:640:in `new_constants_in'
    from /usr/lib/ruby/gems/1.8/gems/activesupport-3.1.0/lib/active_support/dependencies.rb:223:in `load_dependency'
    from /usr/lib/ruby/gems/1.8/gems/activesupport-3.1.0/lib/active_support/dependencies.rb:240:in `require'
    from /usr/lib/ruby/gems/1.8/gems/ar-octopus-0.3.4/lib/octopus.rb:66
    from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.21/lib/bundler/runtime.rb:68:in `require'
    from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.21/lib/bundler/runtime.rb:68:in `require'
    from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.21/lib/bundler/runtime.rb:66:in `each'
    from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.21/lib/bundler/runtime.rb:66:in `require'
    from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.21/lib/bundler/runtime.rb:55:in `each'
    from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.21/lib/bundler/runtime.rb:55:in `require'
    from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.21/lib/bundler.rb:122:in `require'
    from /var/www/scandetails/config/application.rb:7
    from /usr/lib/ruby/gems/1.8/gems/railties-3.1.0/lib/rails/commands.rb:38:in `require'
    from /usr/lib/ruby/gems/1.8/gems/railties-3.1.0/lib/rails/commands.rb:38
    from script/rails:6:in `require'
    from script/rails:6

Answer 1

根据这个拉取请求,已经在gem的主分支中添加了Rails 3.1支持,但是尚未发布更新版本.您可以通过引用Gemfile中的github存储库,将存储库的主分支用作gem的源:

gem 'ar-octopus', :git => "git://github.com/tchandy/octopus.git", :require => "octopus"