Example code for doing HTTP content negotiation for Linked Data in Ruby on Rails
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Ruby on Rails Linked Data content negotiation skeleton code.

This is a complete (though very simple!) Ruby on Rails application (version 2.3.2). The only non-standard files are the following:

- app/controllers/resources_controller.rb - This is the file that actually does the content negotiation, using the standard Rails 'respond_to' method.    
- config/environment.rb - includes the definition of the application/rdf+xml MIME type and maps it to the .rdf extension.
- config/routes.rb - maps URLs of the form <domain>/resources/<id> to the 'show' action of 'resources_controller'
- app/views/resources/show.erb - to generate the HTML representation of a resource (dummy code only)
- app/views/resources/show.rxml - to generate the RDF representaiton of a resource (dummy code only)

This example assumes the following approach to URIs:

http://<my domain>/resources/<resource_name>   - URI for the resource
http://<my domain>/resources/<resource_name>.html - HTML description of the resource
http://<my domain>/resources/<resource_name>.rdf - RDF description of the resource

To run the application you will need to set up an empty MySQL database called 'conneg_development' with user 'root' and password 'admin' or of course adapt the file config/database.yml to match your own choices for database name and account details.

To check if it is working: 
1. run the app in development mode 
2. In your browser, enter the url http://localhost:3000/resources/test1
3. You should be redirected to http://localhost:3000/resources/test1.html and see the text "HTML description of the resource here."
4. In your browser, enter the url http://localhost:3000/resources/test1.rdf - you should see some valid RDF
5. From the command line (on Unix like systems) enter:
          curl -v -H "Accept: application/rdf+xml" http://localhost:3000/resources/test1
You should get a response like this:

> GET /resources/test1 HTTP/1.1
> User-Agent: curl/7.16.3 (powerpc-apple-darwin9.0) libcurl/7.16.3 OpenSSL/0.9.7l zlib/1.2.3
> Host: localhost:3000
> Accept: application/rdf+xml
< HTTP/1.1 303 See Other
< Connection: close
< Date: Mon, 06 Jul 2009 10:05:18 GMT
< X-Runtime: 3
< Location: http://localhost:3000/resources/test1.rdf
< Content-Type: application/rdf+xml; charset=utf-8
< Cache-Control: no-cache
< Content-Length: 107

Any questions, contact me at bill@swirrl.com

Bill Roberts, 06 July, 2009.

The code in this example is released under the MIT license http://www.opensource.org/licenses/mit-license.php
Copyright (c) 2009, Swirrl IT Ltd., http://www.swirrl.com