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Re: Issue with Spira has_many

From: Greg Lappen <greg@lapcominc.com>
Date: Tue, 1 Feb 2011 15:27:04 -0500
Message-ID: <AANLkTi=T2R7mvJxYPYCorQu21eKvrTqMP6Pbbi0sGK+c@mail.gmail.com>
To: Ben Lavender <blavender@gmail.com>
Cc: Daniel Gagne <danny@dannygagne.com>, public-rdf-ruby@w3.org
Actually, type => :'OpenMedia::Schema::SKOS::Concept' did the trick.  I
didn't see the leading colon making the whole thing a symbol.

Thanks!

Greg

On Tue, Feb 1, 2011 at 3:06 PM, Greg Lappen <greg@lapcominc.com> wrote:

> 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 20:27:57 GMT

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