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Riak::YzQuery

EXPERIMENTAL! DO NOT USE IN PRODUCTION! THERE ARE SECURITY HOLES!

Riak 2.0 will feature Yokozuna, a distributed search system built on Apache Solr. Riak::YzQuery aims to provide Arel-style querying for Yokozuna.

Installation

Add this line to your application's Gemfile:

gem 'riak-yz-query'

And then execute:

$ bundle

Or install it yourself as:

$ gem install riak-yz-query

Usage

You've already got a Riak bucket full of JSON documents as such:

{
  name_t: "Bryce Kerley",
  title_t: "Cosmopolitan Space Emperor",
  created_dt: "2007-12-13T23:59:59Z"
}

To create a blank query, pull it from the Riak::Bucket:

q = @bucket.query

Let's look for Bryce:

q = @bucket.query.where name_t: 'Bryce'
q.keys #=> ['Hswdh9zli0CDcnPSKmEGeIcd6tU']
q.values #=> {"Hswdh9zli0CDcnPSKmEGeIcd6tU"=> #<Riak::RObject {user,Hswdh...}>}

In the above example, q is a Riak::YzQuery::QueryBuilder instance. As the name implies, and much like Active Record, you can build up more complex queries by chaining constraints.

q = @bucket.query.where name_t: 'Andrew'
q.keys #=> ["PtgA5YsxWpSg7RzTY2eJVJ81hDQ", "OL1quOfOKiYEmxYsqvjf9cyRmH3"]
q2 = q.where name_t: 'Stone'
q2.keys #=> ["OL1quOfOKiYEmxYsqvjf9cyRmH3"]

where clauses are ANDed together. To OR together two values, use a string:

q = @bucket.query.where 'name_t:Andrew OR name_t:Drew'
q.keys #=> ["Z0tsBudxTQp50pBlTNeBw6CtwZx", "OL1quOfOKiYEmxYsqvjf9cyRmH3", "PtgA5YsxWpSg7RzTY2eJVJ81hDQ"]

If you don't want to concatenate the string yourself, use an array.

WARNING: THIS DOES NOT ADEQUATELY ESCAPE THINGS! Your application could host the first Yokozuna-injection exploit!

q = @bucket.query.where ['name_t:? OR name_t:?', 'Drew', 'Andrew']
q.keys #=> ["Z0tsBudxTQp50pBlTNeBw6CtwZx", "OL1quOfOKiYEmxYsqvjf9cyRmH3", "PtgA5YsxWpSg7RzTY2eJVJ81hDQ"]

You can sort:

q = @bucket.query.where(name_t: 'Andrew').order(created_dt: 'asc').keys
#=> ["OL1quOfOKiYEmxYsqvjf9cyRmH3", "PtgA5YsxWpSg7RzTY2eJVJ81hDQ"]
q = @bucket.query.where(name_t: 'Andrew').order('created_dt desc').keys
#=> ["PtgA5YsxWpSg7RzTY2eJVJ81hDQ", "OL1quOfOKiYEmxYsqvjf9cyRmH3"]

And you can paginate:

q = @bucket.query.
        where(name_t: '*e*').
        order(created_dt: 'asc').
        limit(5).
        offset(5)

Contributing

  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request