So I'm trying to use a Rails URL helper (page_url) to create URLs that contain special characters, including ampersands. Most cases work like you'd expect them to:

(rdb:1) page_url('foo', :host => 'host')
"http://host/pages/foo"
(rdb:1) page_url('foo_%_bar', :host => 'host')
"http://host/pages/foo_%25_bar"

But for some odd reason, ampersands are not escaped:

(rdb:1) page_url('foo_&_bar', :host => 'host')
"http://host/pages/foo_&_bar"

And if I pre-escape them, they get corrupted:

(rdb:1) page_url('foo_%26_bar', :host => 'host')
"http://host/pages/foo_%2526_bar"

CGI::escape, on the other hand, escapes them fine:

(rdb:1) CGI::escape('foo_&_bar')
"foo_%26_bar"

What's going on, and how do I work around this? (With something nicer than gsub('&', '%26'), that is.)

ruby-on-rails helper url-encoding
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