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If I'm in an RHTML view in Rails, it is easy to URL-escape something:
<a href="/redirect?href=<%=u target %>">Foo</a> How do I do this in a string? I'd like to do something like this:
<% redirect_href = "/redirect?#{url_escape target}&foo=bar&baz=some_other_stuff" -%> <a href="<%= redirect_href =>">Foo</a> This must be trivial, right?
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URL escape codes for characters that must be escaped lists the characters that must be escaped in URLs. If you must escape a character in a string literal, you must use the dollar sign ($) instead of percent (%); for example, use query=title%20EQ%20"$3CMy title$3E" instead of query=title%20EQ%20'%3CMy title%3E' .
CGI. escape is for escaping a URL value in the query string. All characters that don't fall into the ALPHA, DIGIT, '_', '-', '. ' and ' ' character set are escaped.
CGI.escape will do it:
<% redirect_href = "/redirect?#{CGI.escape target}&foo=bar&baz=some_other_stuff" -%> <a href="<%= redirect_href =>">Foo</a> Rails (activesupport) defines Hash#to_param (aliased to Hash#to_query):
{foo: 'asd asdf', bar: '"<#$dfs'}.to_param # => "bar=%22%3C%23%24dfs&foo=asd+asdf" It's worth noting that it sorts query keys (for HTTP caching).
Hash#to_param also accepts optional namespace parameter:
{name: 'David', nationality: 'Danish'}.to_param('user') # => "user[name]=David&user[nationality]=Danish" http://api.rubyonrails.org/classes/Hash.html#method-i-to_param
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