- From: Greg Lappen <greg@lapcominc.com>
- Date: Tue, 1 Feb 2011 15:06:08 -0500
- To: Ben Lavender <blavender@gmail.com>
- Cc: Daniel Gagne <danny@dannygagne.com>, public-rdf-ruby@w3.org
- Message-ID: <AANLkTikELcAtXAqybE9LW1MTUC3fsyiLuxCSm48tNWrS@mail.gmail.com>
Thanks for the suggestions. I did try both of those, which failed as soon as the ConceptScheme class is loaded. On Tue, Feb 1, 2011 at 3:03 PM, Ben Lavender <blavender@gmail.com> wrote: > You infer correctly that it's a class loader issue; I haven't tested > Spira with rails. Danny is correct in that a more specific reference > to the class is probably required. > > Ben > > On Tue, Feb 1, 2011 at 8:55 PM, Daniel Gagne <danny@dannygagne.com> wrote: > > it looks like it can't find the symbol perhaps try > > > > type => :'OpenMedia::Schema::SKOS::Concept' > > > > or > > > > type => OpenMedia::Schema::SKOS::Concept > > > > danny > > > > On Tue, Feb 1, 2011 at 2:49 PM, Greg Lappen <greg@lapcominc.com> wrote: > >> Hello again everyone, > >> I am now attempting to do some integration of RDF with our Ruby on Rails > >> application, and found the Spira project which I have to say is just > awesome > >> - it's a perfect fit for what we want to do. I'm having a small problem > >> though with getting relationships between our Spira resources to work. > I > >> basically have one class, and it is going to "have many" of another > class. > >> The subject matter happens to be SKOS concept and concept schemes. > Here's > >> the basic code: > >> in app/models/open_media/schema/skos/concept.rb: > >> class OpenMedia::Schema::SKOS::Concept > >> include Spira::Resource > >> > >> default_source :types > >> base_uri "http://data.openmedia.org/" > >> type SKOS.Concept > >> property :label, :predicate=>SKOS.label, :type=>XSD.string > >> end > >> in app/models/open_media/schema/skos/concept_scheme.rb: > >> class OpenMedia::Schema::SKOS::ConceptScheme > >> include Spira::Resource > >> > >> default_source :types > >> base_uri "http://data.openmedia.org/" > >> type SKOS.ConceptScheme > >> property :label, :predicate=>SKOS.prefLabel, :type=>XSD.string > >> has_many :top_concepts, :predicate=>SKOS.hasTopConcept, > :type=>:Concept > >> end > >> So with the has_many type being the symbol :Concept, I get the following > >> error: > >> ArgumentError: OpenMedia::Schema::SKOS is not missing constant Concept! > >> from > >> /Users/greg/.rvm/gems/ree-1.8.7-2010.02@openmedia > /gems/activesupport-3.0.3/lib/active_support/dependencies.rb:479:in > >> `load_missing_constant' > >> from > >> /Users/greg/.rvm/gems/ree-1.8.7-2010.02@openmedia > /gems/activesupport-3.0.3/lib/active_support/dependencies.rb:183:in > >> `const_missing' > >> from > >> /Users/greg/.rvm/gems/ree-1.8.7-2010.02@openmedia > /gems/activesupport-3.0.3/lib/active_support/dependencies.rb:181:in > >> `each' > >> from > >> /Users/greg/.rvm/gems/ree-1.8.7-2010.02@openmedia > /gems/activesupport-3.0.3/lib/active_support/dependencies.rb:181:in > >> `const_missing' > >> from > >> /Users/greg/.rvm/gems/ree-1.8.7-2010.02@openmedia > /gems/spira-0.0.11/lib/spira/resource/dsl.rb:209:in > >> `const_get' > >> from > >> /Users/greg/.rvm/gems/ree-1.8.7-2010.02@openmedia > /gems/spira-0.0.11/lib/spira/resource/dsl.rb:209:in > >> `qualified_const_get' > >> from > >> /Users/greg/.rvm/gems/ree-1.8.7-2010.02@openmedia > /gems/rdf-0.3.1/lib/rdf/ntriples/reader.rb:184:in > >> `inject' > >> from > >> /Users/greg/.rvm/gems/ree-1.8.7-2010.02@openmedia > /gems/spira-0.0.11/lib/spira/resource/dsl.rb:209:in > >> `each' > >> from > >> /Users/greg/.rvm/gems/ree-1.8.7-2010.02@openmedia > /gems/spira-0.0.11/lib/spira/resource/dsl.rb:209:in > >> `inject' > >> from > >> /Users/greg/.rvm/gems/ree-1.8.7-2010.02@openmedia > /gems/spira-0.0.11/lib/spira/resource/dsl.rb:209:in > >> `qualified_const_get' > >> from > >> /Users/greg/.rvm/gems/ree-1.8.7-2010.02@openmedia > /gems/spira-0.0.11/lib/spira/resource/dsl.rb:178:in > >> `classize_resource' > >> from > >> /Users/greg/.rvm/gems/ree-1.8.7-2010.02@openmedia > /gems/spira-0.0.11/lib/spira/resource/dsl.rb:142:in > >> `build_value' > >> from > >> /Users/greg/.rvm/gems/ree-1.8.7-2010.02@openmedia > /gems/spira-0.0.11/lib/spira/resource/instance_methods.rb:91:in > >> `reload_attributes' > >> from > >> /Users/greg/.rvm/gems/ree-1.8.7-2010.02@openmedia > /gems/rdf-0.3.1/lib/rdf/mixin/queryable.rb:70:in > >> `each' > >> from > >> /Users/greg/.rvm/gems/ree-1.8.7-2010.02@openmedia > /gems/rdf-0.3.1/lib/rdf/mixin/queryable.rb:70:in > >> `grep' > >> from > >> /Users/greg/.rvm/gems/ree-1.8.7-2010.02@openmedia > /gems/rdf-0.3.1/lib/rdf/mixin/queryable.rb:70:in > >> `each' > >> Without the relationship between them, both classes work great. Am I > right > >> in thinking it's a disagreement between Rails class loading mechanism > and > >> how Spira is trying to load the has_many type? I can reference > >> OpenMedia::Schema::SKOS::Concept fine in rails console, but as soon as I > >> save the concept scheme with a concept in the has_many, I get this > error. > >> Any ideas? I was prepared to fix this and submit a patch, but an hour > >> later, no such luch. Thanks! > >> Greg > > > > >
Received on Tuesday, 1 February 2011 20:10:24 UTC