demonstrates a discrepancy between RDF::Query#each_solution and RDF::Query#solutions.each

rdf-query-each_solution-test-case.rb

require 'rubygems'
require 'rdf'
require 'rdf/rdfxml'
require 'sparql/client'

lmdb = SPARQL::Client::Repository.new 'http://data.linkedmdb.org/sparql'

query = lmdb.client.
  select(:movie).
  prefix('movie: <http://data.linkedmdb.org/resource/movie/>').
  where(
    [:actor, RDF::URI.new('http://data.linkedmdb.org/resource/movie/actor_name'), 'Peter O\'Toole'],
    [:movie, RDF::URI.new('http://data.linkedmdb.org/resource/movie/actor'), :actor]
  )

solutions = 0
query.each_solution { |s| solutions+=1 }

puts "each_solutions #{solutions} vs. solutions.each #{query.solutions.size}"