weird behavior with class compares

[Mike Travers]

This was utterly confusing me, until I figured out it is because ActiveRDF specializes the == method for its classes!

>> b = BNode.new("foo")
=> #<BNode:0x371ace8 @predicates={}, @uri="foo">
>> b.class
=> BNode
>> RDFS::Resource
=> RDFS::Resource
>> BNode.class
=> Class
>> RDFS::Resource.class
=> Class
>> b.class == RDFS::Resource
NoMethodError: You have a nil object when you didn't expect it!
The error occurred while evaluating nil.uri
 from /usr/local/lib/ruby/gems/1.8/gems/activerdf-1.6.8/lib/active_rdf/objectmanager/resource.rb:48:in `uri'
 from /usr/local/lib/ruby/gems/1.8/gems/activerdf-1.6.8/lib/active_rdf/objectmanager/resource.rb:50:in `=='
 from (irb):79
 from :0

[michael (michael-thinknasium)]

There is a bug here and its that BNode doesn't have a class_uri set.

b.class != RDFS::Resource
b.class == RDFS::Resource.class