orm.save with an rdf:type doesn't work with Fedora 4.0.0-alpha-3

[bmaddy]

There is a discrepancy with how the ldp gem and Fedora implement the ldp spec.

This bug is here as a reminder to resolve this discrepancy with the Fedora team.

By default, if you load a resource with the ldp gem and then save it, it will send all the triples it found back to Fedora. This includes the rdf:type. Fedora will throw an error when it gets an rdf:type it doesn't understand.

Workaround

As long as you aren't actually trying to set the rdf:type, you can just remove it to get the save to be successful:

orm.graph.delete([orm.resource.subject_uri, RDF::URI.new("http://www.w3.org/1999/02/22-rdf-syntax-ns#type"), nil])

Related info

Discussion on Fedora mailing list: https://groups.google.com/forum/#!topic/fedora-tech/2lLFN4_1LTI
A demonstration of what the ldp gem is trying to do (using curl): https://gist.github.com/bmaddy/9073793
The LDP spec: http://www.w3.org/TR/ldp/

[jcoyne]

       STATUS: 500 org.fcrepo.kernel.exception.MalformedRdfException: Unable to resolve registered namespace for resource http://www.w3.org/ns/ldp#Container
        at org.fcrepo.kernel.utils.iterators.PersistingRdfStreamConsumer.jcrMixinNameFromRdfResource(PersistingRdfStreamConsumer.java:181)
        at org.fcrepo.kernel.utils.iterators.RdfAdder.operateOnMixin(RdfAdder.java:64)
        at org.fcrepo.kernel.utils.iterators.PersistingRdfStreamConsumer.operateOnTriple(PersistingRdfStreamConsumer.java:133)
        at org.fcrepo.kernel.utils.iterators.PersistingRdfStreamConsumer.consume(PersistingRdfStreamConsumer.java:116)