确认 will_paginate 已加载答案

【问题标题】：Confirm that will_paginate has loaded确认 will_paginate 已加载
【发布时间】：2013-10-30 18:33:36
【问题描述】：

为了解决我在Why do I get “undefined method 'paginate'” error in production? 中讨论的问题，我正在运行

bundle exec rails runner -e production 'WillPaginate'

在这个 github 问题中建议的服务器上： https://github.com/mislav/will_paginate/issues/308#issuecomment-17167158

问题：如果我没有得到任何输出，那是确认 will_paginate 运行正确吗？

我正在使用：Ruby 2.0.0p247、Rails 4.0.0、Ubuntu 12.10 LTS、Unicorn、Capistrano

【问题讨论】：

标签： ruby-on-rails ruby unicorn will-paginate rvm-capistrano

【解决方案1】：

您是对的：如果您没有看到任何输出，这意味着 Ruby 能够解析该常量，这意味着 will_paginate 已在您的生产环境中正确加载。

如果不是，您将看到“未初始化的常量”错误，如下所示：

/home/ash/.rbenv/versions/2.1.0-preview1/lib/ruby/gems/2.1.0/gems/railties-4.0.0/lib/rails/commands/runner.rb:53:in `eval': uninitialized constant WillPaginate (NameError)
        from /home/ash/.rbenv/versions/2.1.0-preview1/lib/ruby/gems/2.1.0/gems/railties-4.0.0/lib/rails/commands/runner.rb:53:in `eval'
        from /home/ash/.rbenv/versions/2.1.0-preview1/lib/ruby/gems/2.1.0/gems/railties-4.0.0/lib/rails/commands/runner.rb:53:in `<top (required)>'
        from /home/ash/.rbenv/versions/2.1.0-preview1/lib/ruby/gems/2.1.0/gems/railties-4.0.0/lib/rails/commands.rb:86:in `require'
        from /home/ash/.rbenv/versions/2.1.0-preview1/lib/ruby/gems/2.1.0/gems/railties-4.0.0/lib/rails/commands.rb:86:in `<top (required)>'
        from bin/rails:4:in `require'
        from bin/rails:4:in `<main>'

【讨论】：