如何URL转义Rails中的字符串？

Question

如果我在Rails中的RHTML视图中,很容易URL转义:

<a href="/redirect?href=<%=u target %>">Foo</a>

我如何在字符串中执行此操作？我想做这样的事情:

<% redirect_href = "/redirect?#{url_escape target}&amp;foo=bar&amp;baz=some_other_stuff" -%>
<a href="<%= redirect_href =>">Foo</a>

这一定是微不足道的吧？

Answer 1

CGI.escape会这样做:

<% redirect_href = "/redirect?#{CGI.escape target}&amp;foo=bar&amp;baz=some_other_stuff" -%>
<a href="<%= redirect_href =>">Foo</a>

Answer 2

Rails(activesupport)定义Hash#to_param(别名Hash#to_query):

 {foo: 'asd asdf', bar: '"<#$dfs'}.to_param
 # => "bar=%22%3C%23%24dfs&foo=asd+asdf"

值得注意的是,它对查询键进行排序(用于HTTP缓存).

Hash#to_param 还接受可选的namespace参数:

{name: 'David', nationality: 'Danish'}.to_param('user')
# => "user[name]=David&user[nationality]=Danish"

http://api.rubyonrails.org/classes/Hash.html#method-i-to_param

Answer 3

ERB :: Util.url_encode

可以从任何地方使用,ruby std lib的一部分.

Answer 4

Use either CGI::escape or ERB::Util.url_encode but not URI.encode.

URI.escape has been deprecated circa Ruby 1.9.2: What's the difference between URI.escape and CGI.escape?