discourse/app/controllers/permalinks_controller.rb

class PermalinksController < ApplicationController
  skip_before_filter :check_xhr, :preload_json

  def show
    url = params[:url]
    url = "#{url}?#{request.query_string}" if request.query_string.present?
    permalink = Permalink.find_by_url(url)
    if permalink && permalink.target_url
      redirect_to permalink.target_url, status: :moved_permanently
    else
      raise Discourse::NotFound
    end
  end
end
FEATURE: add a way to map arbitrary urls to a topic, post, or category. Useful for sites that have migrated to Discourse and want to redirect from their old site to Discourse with 301 redirects. 2014-08-29 03:09:36 +08:00			`class PermalinksController < ApplicationController`
			`skip_before_filter :check_xhr, :preload_json`

			`def show`
FIX: support Permalink urls with query string 2014-09-11 01:58:52 +08:00			`url = params[:url]`
			`url = "#{url}?#{request.query_string}" if request.query_string.present?`
			`permalink = Permalink.find_by_url(url)`
FEATURE: add a way to map arbitrary urls to a topic, post, or category. Useful for sites that have migrated to Discourse and want to redirect from their old site to Discourse with 301 redirects. 2014-08-29 03:09:36 +08:00			`if permalink && permalink.target_url`
			`redirect_to permalink.target_url, status: :moved_permanently`
			`else`
			`raise Discourse::NotFound`
			`end`
			`end`
			`end`