ruby - 哈希的未定义方法 `to_i'

Question

我正在尝试为我的 Rack 应用程序创建一个子域路由器，但我遇到了一个问题。这是我的 config.ru 代码:

require './controllers/subdomain'
require './controllers/www'

set :root, './'

run Example::Subdomain.new({
                                :www => Sinatra::Application
                            })

这是我的 subdomain.rb 代码:

module Example
  class Subdomain
    def initialize(map = {})
      @map = map
    end

    def call(env)
      @map.each do |subdomain, app|
        if env['HTTP_HOST'].split('.').first.eql?(subdomain)
          app.call(env)
        end
      end
    end
  end
end

当我运行它时，出现以下错误:

NoMethodError: undefined method `to_i' for {:www=>Sinatra::Application}:Hash
  /Library/Ruby/Gems/1.8/gems/rack-1.5.2/lib/rack/lint.rb:555:in `check_status'
  /Library/Ruby/Gems/1.8/gems/rack-1.5.2/lib/rack/lint.rb:19:in `call'
  /Library/Ruby/Gems/1.8/gems/rack-1.5.2/lib/rack/lint.rb:19:in `assert'
  /Library/Ruby/Gems/1.8/gems/rack-1.5.2/lib/rack/lint.rb:555:in `check_status'
  /Library/Ruby/Gems/1.8/gems/rack-1.5.2/lib/rack/lint.rb:51:in `_call'
  /Library/Ruby/Gems/1.8/gems/rack-1.5.2/lib/rack/lint.rb:37:in `call'
  /Library/Ruby/Gems/1.8/gems/rack-1.5.2/lib/rack/showexceptions.rb:24:in `call'
  /Library/Ruby/Gems/1.8/gems/rack-1.5.2/lib/rack/commonlogger.rb:33:in `call_without_check'
  /Library/Ruby/Gems/1.8/gems/sinatra-1.3.6/lib/sinatra/base.rb:161:in `call'
  /Library/Ruby/Gems/1.8/gems/rack-1.5.2/lib/rack/chunked.rb:43:in `call'
  /Library/Ruby/Gems/1.8/gems/rack-1.5.2/lib/rack/content_length.rb:14:in `call'
  /Library/Ruby/Gems/1.8/gems/thin-1.5.0/lib/thin/connection.rb:81:in `pre_process'
  /Library/Ruby/Gems/1.8/gems/thin-1.5.0/lib/thin/connection.rb:79:in `catch'
  /Library/Ruby/Gems/1.8/gems/thin-1.5.0/lib/thin/connection.rb:79:in `pre_process'
  /Library/Ruby/Gems/1.8/gems/thin-1.5.0/lib/thin/connection.rb:54:in `process'
  /Library/Ruby/Gems/1.8/gems/thin-1.5.0/lib/thin/connection.rb:39:in `receive_data'
  /Library/Ruby/Gems/1.8/gems/eventmachine-1.0.3/lib/eventmachine.rb:187:in `run_machine'
  /Library/Ruby/Gems/1.8/gems/eventmachine-1.0.3/lib/eventmachine.rb:187:in `run'
  /Library/Ruby/Gems/1.8/gems/thin-1.5.0/lib/thin/backends/base.rb:63:in `start'
  /Library/Ruby/Gems/1.8/gems/thin-1.5.0/lib/thin/server.rb:159:in `start'
  /Library/Ruby/Gems/1.8/gems/rack-1.5.2/lib/rack/handler/thin.rb:16:in `run'
  /Library/Ruby/Gems/1.8/gems/rack-1.5.2/lib/rack/server.rb:264:in `start'
  /Library/Ruby/Gems/1.8/gems/rack-1.5.2/lib/rack/server.rb:141:in `start'
  /Library/Ruby/Gems/1.8/gems/rack-1.5.2/bin/rackup:4
  /usr/bin/rackup:19:in `load'
  /usr/bin/rackup:19
  -e:1:in `load'
  -e:1

有没有人知道为什么会发生这种情况而不是运行 app.call(env)？

这是错误的截图: http://i46.tinypic.com/3538is6.jpg

此代码也有效，但它不遵守子域规则:

module Example
  class Subdomain
    def initialize(map = {})
      @map = map
    end

    def call(env)
      @map.each do |subdomain, app|
        return app.call(env)
      end
    end
  end
end

Answer 1

Rack 认为您正在为响应的三元组中的状态代码返回 @map，即 [status, headers, body](如 here 所示) ).这是因为 each 在其迭代结束时返回集合，并且它被用作您的 call 的返回值。

也许这对您有用，或者至少让您入门:

def call(env)
  subdomain = env['HTTP_HOST'].split('.').first
  app = @map[subdomain]
  app.call(env)
end