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我在 Ruby 1.9.3 和 Rails 3.0.11 上。我最近安装了 Draper(0.12.0) gem，但我无法运行它的生成器。当我尝试在 Post 模型上运行生成器时出现以下错误：-

rails generate decorator Post
/home/mohnish/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.0.11/lib/active_support/whiny_nil.rb:48:in `method_missing': undefined method `config' for nil:NilClass (NoMethodError)
    from /home/mohnish/.rvm/gems/ruby-1.9.3-p194/gems/draper-0.12.0/lib/draper/railtie.rb:6:in `block in <class:Railtie>'
    from /home/mohnish/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.0.11/lib/rails/railtie.rb:189:in `call'
    from /home/mohnish/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.0.11/lib/rails/railtie.rb:189:in `each'
    from /home/mohnish/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.0.11/lib/rails/railtie.rb:189:in `load_generators'
    from /home/mohnish/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.0.11/lib/rails/application.rb:147:in `block in load_generators'
    from /home/mohnish/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.0.11/lib/rails/application/railties.rb:11:in `each'
    from /home/mohnish/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.0.11/lib/rails/application/railties.rb:11:in `all'
    from /home/mohnish/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.0.11/lib/rails/application.rb:147:in `load_generators'
    from /home/mohnish/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.0.11/lib/rails/generators.rb:319:in `load_generators_from_railties!'
    from /home/mohnish/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.0.11/lib/rails/generators.rb:278:in `lookup'
    from /home/mohnish/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.0.11/lib/rails/generators.rb:141:in `find_by_namespace'
    from /home/mohnish/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.0.11/lib/rails/generators.rb:161:in `invoke'
    from /home/mohnish/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.0.11/lib/rails/commands/generate.rb:10:in `<top (required)>'
    from /home/mohnish/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.0.11/lib/active_support/dependencies.rb:239:in `require'
    from /home/mohnish/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.0.11/lib/active_support/dependencies.rb:239:in `block in require'
    from /home/mohnish/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.0.11/lib/active_support/dependencies.rb:225:in `block in load_dependency'
    from /home/mohnish/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.0.11/lib/active_support/dependencies.rb:593:in `new_constants_in'
    from /home/mohnish/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.0.11/lib/active_support/dependencies.rb:225:in `load_dependency'
    from /home/mohnish/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.0.11/lib/active_support/dependencies.rb:239:in `require'
    from /home/mohnish/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.0.11/lib/rails/commands.rb:17:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

任何关于如何调试的输入都会非常有帮助。

谢谢你。

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1 回答 1

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问题是 v0.12.0 中的这一部分（您正在使用的那个）https://github.com/drapergem/draper/blob/v0.12.0/lib/draper/railtie.rb#L5-L8

当我查看主分支时，它们更改为代码如下：https://github.com/drapergem/draper/blob/master/lib/draper/railtie.rb#L5-L10

您应该将 draper gem 升级到最新版本，看看是否仍然出现错误。

于 2013-01-02T11:45:28.920 回答