[Radiant] Solution for installing Radiant in a subdirectory

[Roydon Gyles-Bedford]

My set up:
Radiant is running under mongrel with the prefix flag. --prefix /sub/dir 
This makes /admin work (example.com/sub/dir/admin). (This also works 
when Apache is proxying to mongrel, and mongrel has the prefix flag)

In environment.rb, I have added 
ActionController::AbstractRequest.relative_url_root = "/sub/dir"

The changes to Radiant that are required was actually very simple once i 
figured out where/how to do it.

In models/page_context.rb I added this method:
define_tag 'url' do |tag|
  "#{ActionController::AbstractRequest.relative_url_root}#{tag.locals.page.send(:url)}"
end

and i removed the '+ [:url]' from
((@page.attributes.symbolize_keys.keys + [:url]) - [:created_by, 
:updated_by]).each do |method|

This also works when ActionController::AbstractRequest.relative_url_root 
is not defined, because it'll return "".

This way any calls to <r:url>, <r:link>, etc generate urls with the 
prefix.

I haven't fully tested this, but so far everything seems to work fine.

Roydon G-B

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