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Ripple is a rich Ruby client for Riak, Basho’s distributed database. It includes two namespaces:

• Riak contains a basic wrapper around typical operations, including bucket manipulation, object CRUD, link-walking, and map-reduce.
• Ripple contains an ActiveModel-compatible modeling layer that is inspired by ActiveRecord, DataMapper, and MongoMapper.

Documentation
Wiki

Installation:

gem install ripple

Or git clone git://github.com/seancribbs/ripple.git

Basic Riak::Client example

require 'riak'

# Create a client interface
client = Riak::Client.new

# Retrieve a bucket
bucket = client.bucket("doc")  # a Riak::Bucket

# Get an object from the bucket
object = bucket.get("index.html")   # a Riak::RObject

# Change the object's data and save
object.data = "Hello, world!"
object.store

# Reload an object you already have
object.reload                  # Works if you have the key and vclock, using conditional GET
object.reload :force => true   # Reloads whether you have the vclock or not

# Access more like a hash, client[bucket][key]
client['doc']['index.html']   # the Riak::RObject

# Create a new object
new_one = Riak::RObject.new(bucket, "application.js")
new_one.content_type = "application/javascript" # You must set the content type.
new_one.data = "alert('Hello, World!')"
new_one.store

MapReduce Example

# Assuming you've already instantiated a client, get the album titles for The Beatles
results = Riak::MapReduce.new(client).
                add("artists","Beatles").
                link(:bucket => "albums").
                map("function(v){ return [JSON.parse(v.values[0].data).title]; }", :keep => true).run

p results # => ["Please Please Me", "With The Beatles", "A Hard Day's Night", 
          #     "Beatles For Sale", "Help!", "Rubber Soul",
          #     "Revolver", "Sgt. Pepper's Lonely Hearts Club Band", "Magical Mystery Tour", 
          #     "The Beatles", "Yellow Submarine", "Abbey Road", "Let It Be"]