Riak Ruby Client の README のサンプルを試しただけ。
$ rails c Loading development environment (Rails 4.1.5) [1] pry(main)> client = $riak => #<Riak::Client [#<Node 127.0.0.1:8087>]> [2] pry(main)> bucket = client.bucket 'pizzas' => #<Riak::Bucket {pizzas}> [3] pry(main)> client.create_search_index 'pizzas' => true [4] pry(main)> client.set_bucket_props bucket, { search_index: 'pizzas' }, 'yokozuna' => true [5] pry(main)> meat = bucket.new 'meat' => #<Riak::RObject {pizzas,meat} [#<Riak::RContent [application/json]:nil>]> [6] pry(main)> meat.data = {toppings_ss: %w{pepperoni ham sausage}} => {:toppings_ss=>["pepperoni", "ham", "sausage"]} [7] pry(main)> meat.store type: 'yokozuna' => #<Riak::RObject {pizzas,meat} [#<Riak::RContent [application/json]:{"toppings_ss"=>["pepperoni", "ham", "sausage"]}>]> [8] pry(main)> hawaiian = bucket.new 'hawaiian' => #<Riak::RObject {pizzas,hawaiian} [#<Riak::RContent [application/json]:nil>]> [9] pry(main)> hawaiian.data = {toppings_ss: %w{ham pineapple}} => {:toppings_ss=>["ham", "pineapple"]} [10] pry(main)> hawaiian.store type: 'yokozuna' => #<Riak::RObject {pizzas,hawaiian} [#<Riak::RContent [application/json]:{"toppings_ss"=>["ham", "pineapple"]}>]> [11] pry(main)> result = client.search('pizzas', 'toppings_ss:ham') => {"max_score"=>0.845849335193634, "num_found"=>2, "docs"=> [{"score"=>"8.45849340000000005091e-01", "_yz_rb"=>"pizzas", "_yz_rt"=>"yokozuna", "_yz_rk"=>"meat", "_yz_id"=>"1*yokozuna*pizzas*meat*28", "toppings_ss"=>"sausage"}, {"score"=>"8.45849340000000005091e-01", "_yz_rb"=>"pizzas", "_yz_rt"=>"yokozuna", "_yz_rk"=>"hawaiian", "_yz_id"=>"1*yokozuna*pizzas*hawaiian*49", "toppings_ss"=>"pineapple"}]} [12] pry(main)> result['num_found'] => 2 [13] pry(main)> result['docs'] => [{"score"=>"8.45849340000000005091e-01", "_yz_rb"=>"pizzas", "_yz_rt"=>"yokozuna", "_yz_rk"=>"meat", "_yz_id"=>"1*yokozuna*pizzas*meat*28", "toppings_ss"=>"sausage"}, {"score"=>"8.45849340000000005091e-01", "_yz_rb"=>"pizzas", "_yz_rt"=>"yokozuna", "_yz_rk"=>"hawaiian", "_yz_id"=>"1*yokozuna*pizzas*hawaiian*49", "toppings_ss"=>"pineapple"}]