Override to_enum and enum_for on RDF module?

[cdchapman]

Currently when finding the RDF vocabulary a plain enumerator is returned from the to_enum/enum_for instead of an RDF::Enumerable::Enumerator:

pry> RDF::Vocabulary.find("http://www.w3.org/1999/02/22-rdf-syntax-ns#").to_enum
=> #<Enumerator: ...> #instead of <RDF::Enumerable::Enumerator: ...>

Might it make sense to override the root to_enum and enum_for methods in the RDF module and delegate to RDF::RDFV? The method_missing (in commit 16b995d) approach isn't delegating since these methods are not really missing 😉.

[no-reply]

Are we expecting an RDF::Enumerable::Enumerator, here? That class is Queryable, responds to #each_statement, etc... while I expect Vocabulary instances to enumerate their terms.

What behavior are you looking for?

[cdchapman]

I was doing some light querying over the ruby vocabularies that I have generated, and I expected that the rdf: vocabulary would behave in a way similar to the other vocabularies, i.e. provide an enumerator that I could use to load into a Dataset.

[no-reply]

Ah, yes, I see what you mean.

RDF seems to behave pretty oddly across the board, as a vocab. E.g.:

 RDF::Vocabulary.find("http://www.w3.org/1999/02/22-rdf-syntax-ns#").each { |term| puts term }
=> #<Enumerator: ...>

 RDF::Vocabulary.find("http://www.w3.org/1999/02/22-rdf-syntax-ns#").each.to_a
=> [#<RDF::Vocabulary::Term:0x2ae8de101e44 URI:http://www.w3.org/1999/02/22-rdf-syntax-ns#Alt>,
 #<RDF::Vocabulary::Term:0x2ae8de1017f0 URI:http://www.w3.org/1999/02/22-rdf-syntax-ns#Bag>,
 #<RDF::Vocabulary::Term:0x2ae8de10128c URI:http://www.w3.org/1999/02/22-rdf-syntax-ns#List>,
 #<RDF::Vocabulary::Term:0x2ae8de100d28 URI:http://www.w3.org/1999/02/22-rdf-syntax-ns#Property>,
 #<RDF::Vocabulary::Term:0x2ae8de100738 URI:http://www.w3.org/1999/02/22-rdf-syntax-ns#Seq>,
 #<RDF::Vocabulary::Term:0x2ae8de1001d4 URI:http://www.w3.org/1999/02/22-rdf-syntax-ns#Statement>,
 #<RDF::Vocabulary::Term:0x2ae8de0ffc48 URI:http://www.w3.org/1999/02/22-rdf-syntax-ns#first>,
 #<RDF::Vocabulary::Term:0x2ae8de0ff6e4 URI:http://www.w3.org/1999/02/22-rdf-syntax-ns#object>,
 #<RDF::Vocabulary::Term:0x2ae8de0ff0f4 URI:http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate>,
 #<RDF::Vocabulary::Term:0x2ae8de0feb90 URI:http://www.w3.org/1999/02/22-rdf-syntax-ns#rest>,
 #<RDF::Vocabulary::Term:0x2ae8de0fe5a0 URI:http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>,
 #<RDF::Vocabulary::Term:0x2ae8de0fe03c URI:http://www.w3.org/1999/02/22-rdf-syntax-ns#type>,
 #<RDF::Vocabulary::Term:0x2ae8de0fdab0 URI:http://www.w3.org/1999/02/22-rdf-syntax-ns#value>,
 #<RDF::Vocabulary::Term:0x2ae8de0fd54c URI:http://www.w3.org/1999/02/22-rdf-syntax-ns#HTML>,
 #<RDF::Vocabulary::Term:0x2ae8de0fcf5c URI:http://www.w3.org/1999/02/22-rdf-syntax-ns#PlainLiteral>,
 #<RDF::Vocabulary::Term:0x2ae8de0fc9f8 URI:http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral>,
 #<RDF::Vocabulary::Term:0x2ae8de0fc458 URI:http://www.w3.org/1999/02/22-rdf-syntax-ns#langString>,
 #<RDF::Vocabulary::Term:0x2ae8de0f9e4c URI:http://www.w3.org/1999/02/22-rdf-syntax-ns#>,
 #<RDF::Vocabulary::Term:0x2ae8de0f9884 URI:http://www.w3.org/1999/02/22-rdf-syntax-ns#Description>,
 #<RDF::Vocabulary::Term:0x2ae8de0f9320 URI:http://www.w3.org/1999/02/22-rdf-syntax-ns#ID>,
 #<RDF::Vocabulary::Term:0x2ae8de0f8d30 URI:http://www.w3.org/1999/02/22-rdf-syntax-ns#about>,
 #<RDF::Vocabulary::Term:0x2ae8de0f87cc URI:http://www.w3.org/1999/02/22-rdf-syntax-ns#datatype>,
 #<RDF::Vocabulary::Term:0x2ae8de0f8268 URI:http://www.w3.org/1999/02/22-rdf-syntax-ns#li>,
 #<RDF::Vocabulary::Term:0x2ae8de0f7c50 URI:http://www.w3.org/1999/02/22-rdf-syntax-ns#nil>,
 #<RDF::Vocabulary::Term:0x2ae8de0f7660 URI:http://www.w3.org/1999/02/22-rdf-syntax-ns#nodeID>,
 #<RDF::Vocabulary::Term:0x2ae8de0f70fc URI:http://www.w3.org/1999/02/22-rdf-syntax-ns#parseType>,
 #<RDF::Vocabulary::Term:0x2ae8de0f6b0c URI:http://www.w3.org/1999/02/22-rdf-syntax-ns#resource>]

[gkellogg]

You might try RDF::RDFV.to_enum. But, setting this for RDF would probably not conflict with anything AFAIK.