SparqlAdapter not enabled

[Niko Felger]

The following code fails for activerdf_sparql-1.3.6:

>> ConnectionPool.add_data_source :type => :sparql, :url => "http://DBPedia.org/sparql", :results => :sparql_xml, :engine => :virtuoso
=> #<SparqlAdapter:0xb462e92c @result_format=:sparql_xml, @timeout=50, @reads=true, @engine=:virtuoso, @auth=nil, @request_method=:get, @url="http://DBPedia.org/sparql", @caching=false, @writes=false>
>> ObjectManager.construct_classes
ActiveRdfError: cannot execute query without data sources
        from /home/nfelger/dev/skweb/vendor/gems/activerdf-1.6.11/lib/active_rdf/federation/federation_manager.rb:26:in `query'
        from /home/nfelger/dev/skweb/vendor/gems/activerdf-1.6.11/lib/active_rdf/queryengine/query.rb:190:in `execute'
        from /home/nfelger/dev/skweb/vendor/gems/activerdf-1.6.11/lib/active_rdf/objectmanager/object_manager.rb:24:in `construct_classes'
        from (irb):4

The root cause seems to be the SparqlAdapter not calling its parent's constructor in initialize. This patch fixes it for me:

--- /var/lib/gems/1.8/gems/activerdf_sparql-1.3.6/lib/activerdf_sparql/sparql.rb 2009-01-16 11:48:18.000000000 +0000
+++ vendor/gems/activerdf_sparql-1.3.6/lib/activerdf_sparql/sparql.rb 2009-01-16 11:53:28.000000000 +0000
@@ -27,6 +27,7 @@
   # * :timeout => timeout in seconds to wait for endpoint response
   # * :auth => [user, pass]
   def initialize(params = {})
+ super()
     @reads = true
     @writes = false

Cheers,
Niko