query-test-case.rb

require 'rubygems'
require 'ruby-debug'
require 'spira'
require 'rdf/rdfxml'
require 'sparql/client'


class Actor
  include Spira::Resource

  base_uri 'http://data.linkedmdb.org/resource/actor/'
  type URI.new 'http://data.linkedmdb.org/resource/movie/actor'
  default_vocabulary URI.new('http://data.linkedmdb.org/resource/movie/')

  property :actor_id,   :type => Integer
  property :actor_name,         :type => String
  property :label,      :predicate => RDFS.label,       :type => String
  property :page,       :predicate => FOAF.page,        :type => URI
  has_many :performance,        :type => URI
end

lmdb = SPARQL::Client::Repository.new 'http://data.linkedmdb.org/sparql'
Spira.add_repository! :default, lmdb

Debugger.start
Debugger.add_breakpoint('SPARQL::Client', 'query')
#Debugger.add_breakpoint('SPARQL::Client', 'get')

js = Actor.for(9)

# 
# this will call SPARQL::Client#query twice for each property with a
# CONSTRUCT query
#
puts js.actor_name

sparql-client.diff

--- lib/sparql/client.rb.orig 2010-10-19 14:35:53.000000000 +0000
+++ lib/sparql/client.rb 2010-10-19 14:42:59.000000000 +0000
@@ -28,7 +28,8 @@
     # @param [Hash{Symbol => Object}] options
     def initialize(url, options = {}, &block)
       @url, @options = RDF::URI.new(url.to_s), options
- @headers = {'Accept' => "#{RESULT_JSON}, #{RESULT_XML}, text/plain"}
+ @headers = {'Accept' => [RESULT_JSON, RESULT_XML,
+ RDF::Format.content_types.collect { |k,v| k.to_s }].join(', ')}
  
       if block_given?
         case block.arity