Expose rails routes to javascript. Improve this stuff and get beer from me ;)

application.js

// This is not a parser - just simple implementation, which ignores optional segments, constraints, conditions,
// nesting of optional segments etc...
// Feel free to implement rich parser in JS ;)
var RailsRouter = {
	expose_all : function(arr) {
		for each (var route in arr) {
			this.expose_route(route)
		}
	},
	
	expose_route : function(route) {
		this[ route.name + '_path' ] = function(attrs) {
			attrs = attrs || {} //don't fail, if route has no options
			var res;
			//remove optional segments
			res = route.path.replace( /([(][^():]*:\w+[^():]*[)])/g , '')
			
			for each (var key in route.segment_keys) {
				regexp = new RegExp('(:'+ key +')', 'g')
				res = res.replace(regexp, attrs[key])
			}
			
			return res
		}
	},	
};

application_helper.rb

# invoke this helper in layout
def expose_routes
    json_routes = Rails.application.routes.routes.map {|r| {:name => r.name, :path => r.path, :segment_keys => r.segment_keys}}.to_json
    javascript_tag "RailsRouter.expose_all(#{json_routes})"
end

something.js

RailsRouter.page_path({'id':1});
// "/pages/1"
// if pages resource is defined