`<module:Rails>':类服务器的超类不匹配(TypeError) [英] `<module:Rails>': superclass mismatch for class Server (TypeError)

问题描述

我已经看到了这个和其他几个问题，但他们的问题和我的不太一样.

I have seen this and several others question, but their problems are not similar to mine.

我已将以下代码添加到 config/boot.rb 中，以在端口 8081 上运行我的服务器

I have added the following code to the config/boot.rb , to run my server on port 8081

module Rails
  class Server
    def default_options
      super.merge({Port: 8081})
    end
  end
end

然后我尝试运行 rails s，我遇到了这个错误:

Then I tried to run rails s, and i face with this erorr:

/usr/local/rvm/gems/ruby-2.2.1/gems/railties-4.2.4/lib/rails/commands/server.rb:7:in `<module:Rails>': superclass mismatch for class Server (TypeError)
        from /usr/local/rvm/gems/ruby-2.2.1/gems/railties-4.2.4/lib/rails/commands/server.rb:6:in `<top (required)>'

推荐答案

做你想做的事的更好方式:

A better way to do what you want:

require 'rails/commands/server'

module DefaultOptions
  def default_options
    super.merge!(Port: 8081)
  end
end

Rails::Server.prepend(DefaultOptions)

错误消息的原因是因为您试图重新定义 Rails::Server 类并更改它的继承结构.Rails::Server 继承自 ::Rack::Server，但是您的代码试图说它不再如此.因此，您会收到超类不匹配错误.

The reason for the error message is because you are attempting to redefine the Rails::Server class and changing it's inheritance structure. Rails::Server inherits from ::Rack::Server, however your code is trying to say it no longer does. Therefore, you get your superclass mismatch error.

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