title: Create URL for external site with GET parameters in Rails
body: <p>I'm making a Tweet This link in Rails. The URL I need to generate looks something like this:</p>
  
  <pre><code>http://twitter.com/share?url=http%3A%2F%2Fexample.com&amp;text=Hello%20World
  </code></pre>
  
  <p>but a bit more complex. Basically a URL with a load of GET parameters appended</p>
  
  <p>It would be nice to use one of Rails' helpers, to generate this link, something like:</p>
  
  <pre><code>url_for("http://twitter.com/share", :url =&gt; "http://example.com", :text =&gt; "Hello world")
  </code></pre>
  
  <p>But I haven't found anything that works. Anyone have any ideas?</p>