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copied!<p>OK, I've managed to sort out this problem:</p> <p>THere is no way of doing this in Rails by default (at least, not yet). Instead of using namespaces and default values, I needed to install <a href="http://github.com/svenfuchs/routing-filter/tree/master" rel="noreferrer">Sven Fuchs' routing filter</a>.</p> <p>Once the plugin is installed, I added the following file to my lib directory:</p> <pre><code>require 'routing_filter/base' module RoutingFilter class Locale < Base # remove the locale from the beginning of the path, pass the path # to the given block and set it to the resulting params hash def around_recognize(path, env, &block) locale = nil path.sub! %r(^/([a-zA-Z]{2})(?=/|$)) do locale = $1; '' end returning yield do |params| params[:locale] = locale || 'en' end end def around_generate(*args, &block) locale = args.extract_options!.delete(:locale) || 'en' returning yield do |result| if locale != 'en' result.sub!(%r(^(http.?://[^/]*)?(.*))){ "#{$1}/#{locale}#{$2}" } end end end end end </code></pre> <p>I added this line to routes.rb:</p> <pre><code>map.filter 'locale' </code></pre> <p>This basically fills out a before and after hook, generated by the plugin, that wraps the rails routing. </p> <p>When a url is recognised, and before Rails gets to do anything with it, the around_recognize method is called. This will extract a two-letter code representing the locale, and pass it through in the params, defaulting to 'en' if no locale is specified.</p> <p>Likewise, when a url is generated, the locale parameter will be pushed into the URL on the left side.</p> <p>This gives me the following urls and mappings:</p> <pre><code>/ => :locale => 'en' /en => :locale => 'en' /fr => :locale => 'fr' </code></pre> <p>All existing url helpers work as before, with the only difference being that unless the locale is specified, it is preserved:</p> <pre><code>home_path => / home_path(:locale => 'en') => / home_path(:locale => 'fr') => /fr </code></pre>

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