未初始化常量Rack：：Rack (NameError)

Question

我正在尝试首先在我用代码创建的helloworld.ru目录中创建一个rake basic应用程序

类类型定义调用(环境) "200"，{“Content- HelloRack”=>“文本/纯文本”}，"Hello World“结束运行HelloRack.new

我用rackup helloworld.ru运行它，它工作得很好，之后我用代码在同一目录下创建了三个文件Massive.rb

module Rack
  class Massive
    def initialize(app)
      @app = app
    end

    def call(env)
      status, headers, response= @app.call(env)
      [status, headers, "<div style="font-size:5.0em">#{response} - it's all small stuff</div>"]
    end
  end
end

和其他文件的名称是SmallStuff.rb

class SmallStuff
  def call(env)
    ["200", {"Content-Type" => "text/html"}, "Don't Sweat The Small Stuff"]
  end
end

还有一个文件名是config.ru，代码是

require 'rubygems'
require 'rack'

use Rack::Massive
run SmallStuff.new

当我运行rackup config.ru时，它给我错误

/home/ritesh/rails/config.ru:4: uninitialized constant Rack::Massive (NameError)
    from /var/lib/gems/1.8/gems/rack-1.4.4/lib/rack/builder.rb:51:in `instance_eval'
    from /var/lib/gems/1.8/gems/rack-1.4.4/lib/rack/builder.rb:51:in `initialize'
    from /home/ritesh/rails/config.ru:0:in `new'
    from /home/ritesh/rails/config.ru:0

如何删除这个错误我是rake应用程序的新手，可以请任何人提供rake应用程序教程或有用的链接！

Answer 1

看起来你只是少了一两个Ruby文件，首先将你的其他文件重命名为massive.rb和small_stuff.rb (遵循require约定)，然后要求它们如下所示：

require 'rubygems'
require 'rack'

require_relative './massive'
require_relative './small_stuff'

use Rack::Massive
run SmallStuff.new