ruby - 如何使用( ruby ) Rack 中间件组件设置 cookie？

Question

我正在为需要有条件地设置 cookie 的 Rails 应用编写 Rack 中间件组件。我目前正在尝试设置 cookie。通过谷歌搜索，这似乎应该可行:

class RackApp
  def initialize(app)
    @app = app
  end

  def call(env)
    @status, @headers, @response = @app.call(env)
    @response.set_cookie("foo", {:value => "bar", :path => "/", :expires => Time.now+24*60*60})
    [@status, @headers, @response]
  end
end

它不会给出错误，但也不会设置 cookie。我做错了什么？

Answer 1

如果要使用 Response 类，则需要根据调用堆栈下方的中间件层的结果对其进行实例化。 此外，您不需要像这样的中间件的实例变量，并且可能不想那样使用它们(@status 等会在处理请求后留在中间件实例中)

class RackApp
  def initialize(app)
    @app = app
  end

  def call(env)
    status, headers, body = @app.call(env)
    # confusingly, response takes its args in a different order
    # than rack requires them to be passed on
    # I know it's because most likely you'll modify the body, 
    # and the defaults are fine for the others. But, it still bothers me.

    response = Rack::Response.new body, status, headers

    response.set_cookie("foo", {:value => "bar", :path => "/", :expires => Time.now+24*60*60})
    response.finish # finish writes out the response in the expected format.
  end
end

如果您知道自己在做什么，如果您不想实例化一个新对象，您可以直接修改 cookie header 。