Ruby-on-rails 如何从 Rails 中的 URL 获取查询字符串
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How to get a query string from a URL in Rails
提问by Prasaanth Naidu
Is there is a way to get the query string in a passed URL string in Rails?
有没有办法在 Rails 中获取传递的 URL 字符串中的查询字符串？
I want to pass a URL string:
我想传递一个 URL 字符串：
http://www.foo.com?id=4&empid=6
How can I get idand empid?
我怎样才能得到id和empid？
回答by mu is too short
If you have a URL in a string then use URI and CGI to pull it apart:
如果字符串中有 URL，则使用 URI 和 CGI 将其分开：
url = 'http://www.foo.com?id=4&empid=6'
uri = URI.parse(url)
params = CGI.parse(uri.query)
# params is now {"id"=>["4"], "empid"=>["6"]}
id = params['id'].first
# id is now "4"
Please use the standard libraries for this stuff, don't try and do it yourself with regular expressions.
请使用这些东西的标准库，不要尝试使用正则表达式自己做。
Also see Quv's comment about Rack::Utils.parse_querybelow.
另请参阅Rack::Utils.parse_query下面的Quv 评论。
References:
参考：
回答by valk
vars = request.query_parameters
vars['id']
vars['empid']
etc..
等等..
回答by Russell
In a Ruby on Rails controller method the URL parameters are available in a hash called params, where the keys are the parameter names, but as Ruby "symbols" (ie. prefixed by a colon). So in your example, params[:id]would equal 4and params[:empid]would equal 6.
在 Ruby on Rails 控制器方法中，URL 参数在名为 的散列中可用params，其中键是参数名称，但作为 Ruby“符号”（即以冒号为前缀）。所以在你的例子中，params[:id]会等于4和params[:empid]会等于6。
I would recommend reading a good Rails tutorial which should cover basics like this. Here's one example - google will turn up plenty more:
我建议阅读一个很好的 Rails 教程，它应该涵盖这样的基础知识。这是一个例子 - 谷歌会出现更多：
回答by SoAwesomeMan
Rack::Utils.parse_nested_query("a=2") #=> {"a" => "2"}
quoted from: Parse a string as if it were a querystring in Ruby on Rails
引用自： 解析一个字符串，就像它是 Ruby on Rails 中的查询字符串一样
Parse query strings the way rails controllers do. Nested queries, typically via a form field name like this lil guy: name="awesome[beer][chips]" # => "?awesome%5Bbeer%5D%5Bchips%5D=cool", get 'sliced-and-diced' into an awesome hash: {"awesome"=>{"beer"=>{"chips"=>nil}}}
像 rails 控制器那样解析查询字符串。嵌套查询，通常通过像这个 lil guy: 这样的表单字段名称name="awesome[beer][chips]" # => "?awesome%5Bbeer%5D%5Bchips%5D=cool"，将“切片和切块”变成一个很棒的哈希：{"awesome"=>{"beer"=>{"chips"=>nil}}}
http://rubydoc.info/github/rack/rack/master/Rack/Utils.parse_nested_queryhttps://github.com/rack/rack/blob/master/lib/rack/utils.rb#L90
http://rubydoc.info/github/rack/rack/master/Rack/Utils.parse_nested_query https://github.com/rack/rack/blob/master/lib/rack/utils.rb#L90
