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A rich Ruby client for Riak, Basho's distributed database
Tag: v0.7.1

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ripple is a rich Ruby client for Riak, Basho’s distributed
database. It consists of two gems:

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


riak-client requires ActiveSupport 2.3.5 or later, but the version 3 is recommended. I highly recommend the curb gem for better HTTP client performance.

ripple requires Ruby 1.8.7 or later and versions 3 or above of ActiveModel and ActiveSupport (and their dependencies, including i18n). Please see the Rails 3 beta release notes for installing those gems.

In development, you will also need these gems:

  • rspec = 2.0.0.beta6
  • fakeweb >= 1.2
  • curb >= 0.6
  • rack >= 1.0
  • yard >= 0.5.2

Basic Example

require 'riak'

# Create a client interface
client =

# 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 = "Hello, world!"

# 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 =, "application.js")
new_one.content_type = "application/javascript" # You must set the content type. = "alert('Hello, World!')"

Map-Reduce Example

# Assuming you've already instantiated a client, get the album titles for The Beatles
results =
                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"]

Document model Example

require 'ripple'

class Email
  include Ripple::Document
  property :from,    String, :presence => true
  property :to,      String, :presence => true
  property :sent,    Time,   :default => proc { }
  property :body,    String

email = Email.find("37458abc752f8413e")  # GET /riak/emails/37458abc752f8413e
email.from = ""                               # PUT /riak/emails/37458abc752f8413e

reply =
reply.from = ""   = ""
reply.body = "Riak is a good fit for scalable Ruby apps."                               # POST /riak/emails (Riak-assigned key)

How to Contribute

  • Fork the project on Github. If you have already forked, use git pull --rebase to reapply your changes on top of the mainline. Example:
    $ git checkout master
    $ git pull --rebase seancribbs master
  • Create a topic branch. If you’ve already created a topic branch, rebase it on top of changes from the mainline “master” branch. Examples:
    • New branch:
      $ git checkout -b topic
    • Existing branch:
      $ git rebase master
  • Write an RSpec example, set of examples, and/or Cucumber story that demonstrate the necessity and validity of your changes. Patches without specs will most often be ignored. Just do it, you’ll thank me later. Documentation patches need no specs, of course.
  • Make your feature addition or bug fix. Make your specs and stories pass (green).
  • Run the suite using multiruby or rvm to ensure cross-version compatibility.
  • Cleanup any trailing whitespace in your code (try whitespace-mode in Emacs, or “Remove Trailing Spaces in Document” in the “Text” bundle in Textmate).
  • Commit, do not mess with Rakefile or VERSION. If related to an existing issue in the tracker, include “Closes #X” in the commit message (where X is the issue number).
  • Send me a pull request.

License & Copyright

Copyright ©2010 Sean Cribbs, Sonian Inc., and Basho Technologies, Inc.

Licensed under the Apache License, Version 2.0 (the “License”);
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an “AS IS” BASIS,
See the License for the specific language governing permissions and
limitations under the License.

Auxillary Licenses

The included photo (spec/fixtures/cat.jpg) is Copyright ©2009 Sean Cribbs, and is
licensed under the Creative Commons Attribution Non-Commercial 3.0 license.

The “Poor Man’s Fibers” implementation (lib/riak/util/fiber1.8.rb) is Copyright ©2008 Aman Gupta.

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