OpenSearch.rb

# Notes from http://www.railsonwave.com/2007/2/21/tutorial-opensearch-with-rails-1-2-render-json

# html snippet
# <link rel="search" type="application/opensearchdescription+xml" title="Search a City" href="http://YOUR-ADDRESS/search.xml" />

# Codes SQL - http://www.railsonwave.com/assets/2007/2/20/city_codes.sql.zip


class SearchController < ApplicationController

  def suggest
       @codes ||= cities(:all)
       @res   ||= @codes.map{ |c| c.cityname }
       render  :json=>[params[:city],@res].to_json
  end

  def index
  end

  def you_choose
      @city = cities(:first)
  end
  
  private
  
  def cities(sorting = :all, limit = 10)
    City.find(sorting, :conditions=>["cityname LIKE ?",params[:city]+"%"],
                       :limit=>limit,
                       :group=>"cityname",
                       :order=>"cityname")
  end
end

file search.xml << END
<?xml version="1.0" encoding="UTF-8"?>
<OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/" 
                       xmlns:moz="http://www.mozilla.org/2006/browser/search/">
    <ShortName>US cities lookup</ShortName>
    <Description>Us cities lookup</Description>
    <InputEncoding>UTF-8</InputEncoding>
    <Image height="16" width="16" type="image/x-icon">URL-TO-AN-ICON-FILE</Image>
    <Url type="application/x-suggestions+json" template="http://YOUR-ADDRESS/search/suggest?city={searchTerms}"/>
    <Url type="text/html" method="GET" template="http://YOUR-ADDRESS/search/you_choose/{searchTerms}"/>
</OpenSearchDescription>
END