在Sinatra中获取绝对(基本)URL [英] Get absolute (base) url in sinatra

问题描述

现在，我要做

get '/' do
  set :base_url, "#{request.env['rack.url_scheme']}://#{request.env['HTTP_HOST']}"
  # ...
  haml :index
end

以便能够使用HAML index.haml中的options.base_url. 但是我敢肯定，还有一种更好的，干的方式来做到这一点.但是我看不到，也找不到. (我是Sinatra的新手:))

to be able to use options.base_url in the HAML index.haml. But I am sure there is a far better, DRY, way of doing this. Yet I cannot see, nor find it. (I am new to Sinatra :))

以某种方式，在 get 之外，我没有request.env可用，或者看来.因此，将其放在包含项中是行不通的.

Somehow, outside of get, I don't have request.env available, or so it seems. So putting it in an include did not work.

如何获取基本网址?

推荐答案

几件事.

1. set是一个类级别的方法，这意味着您将根据每个请求修改整个应用程序的状态
2. 上述是一个问题，因为在不同的请求(例如http://foo.com和https://foo.com)上，或者如果您有多个使用DNS指向同一应用服务器的域，则基本URL可能会有所不同

1. set is a class level method, which means you are modifying the whole app's state with each request
2. The above is a problem because potentially, the base url could be different on different requests eg http://foo.com and https://foo.com or if you have multiple domains pointed at the same app server using DNS

更好的策略可能是定义一个助手

A better tactic might be to define a helper

helpers do
  def base_url
    @base_url ||= "#{request.env['rack.url_scheme']}://#{request.env['HTTP_HOST']}"
  end
end

如果您需要在响应查询之外的基本网址(而不是在get/post/put/delete块或视图中)，最好在某个位置手动设置.

If you need the base url outside of responding to queries(not in a get/post/put/delete block or a view), it would be better to set it manually somewhere.

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