Sunspot is a Ruby library for expressive, powerful interaction with the Solr search engine. Sunspot is built on top of the RSolr gem, which provides a low-level interface for Solr interaction; Sunspot provides a simple, intuitive, expressive DSL backed by powerful features for indexing objects and searching for them.

Sunspot is designed to be easily plugged in to any ORM, or even non-database-backed objects such as the filesystem.


  • Define indexing strategy for each searchable class using intuitive block-based API

  • Clean separation between keyword-searchable fields and fields for scoping/ordering

  • Define fields based on existing attributes or “virtual fields” for custom indexing

  • Indexes each object’s entire superclass hierarchy, for easy searching for all objects inheriting from a parent class

  • Intuitive DSL for scoping searches, with all the usual boolean operators available

  • Intuitive interface for requesting facets on indexed fields

  • Extensible adapter architecture for easy integration of other ORMs or non-model classes

  • Refine search using field facets, date range facets, or ultra-powerful query facets

  • Full compatibility with will_paginate

  • Ordering


gem sources -a
gem install outoftime-sunspot

In order to start the packaged Solr installation, run:

sunspot-solr start -- [-d /path/to/data/directory] [-p port] [-s path/to/solr/home] [--pid-dir=path/to/pid/dir]

If you don’t specify a data directory, your Solr index will be stored in your operating system’s temporary directory.

If you specify a solr home, the directory must contain a conf directory, which should contain at least schema.xml and solrconfig.xml. Be sure to copy the schema.xml out of the Sunspot gem’s solr/solr/conf directory. Sunspot relies on the field name patterns defined in the packaged schema.xml, so those cannot be modified.

You can also run your own instance of Solr wherever you’d like; just copy the solr/config/schema.xml file out of the gem’s solr into your installation. You can change the URL at which Sunspot accesses Solr with:

Sunspot.config.solr.url = ''

Rails Integration

The Sunspot::Rails plugin makes integrating Sunspot into Rails drop-in easy.

Using Sunspot

Define an index:

class Post

Sunspot.setup(Post) do
  text :title, :body
  string :author_name
  integer :blog_id
  integer :category_ids
  float :average_rating, :using => :ratings_average
  time :published_at
  string :sort_title do
    title.downcase.sub(/^(an?|the)\W+/, ''/) if title = self.title

See Sunspot.setup for more information.

Note that in order for a class to be searchable, it must have an adapter registered for itself or one of its subclasses. Adapters allow Sunspot to load objects out of persistent storage, and to determine their primary key for indexing. Sunspot::Rails comes with an adapter for ActiveRecord objects, but for other types of models you will need to define your own. See Sunspot::Adapters for more information.

Search for objects:

search = Post do
  keywords 'great pizza'
  with :author_name, 'Mark Twain'
  with(:blog_id).any_of [2, 14]
  with(:category_ids).all_of [4, 10]
  any_of do
    with(:expired_at, nil)
  without :title, 'Bad Title'
  without bad_instance # specifically exclude this instance from results

  paginate :page => 3, :per_page => 15
  order_by :average_rating, :desc

  facet :blog_id

See for more information.

Get data from search:


About the API documentation

All of the methods documented in the RDoc are considered part of Sunspot’s public API. Methods that are not part of the public API are documented in the code, but excluded from the RDoc. If you find yourself needing to access methods that are not part of the public API in order to do what you need, please contact me so I can rectify the situation!


  1. RSolr

  2. Daemons

  3. OptiFlag

  4. Haml

  5. Java

Sunspot has been tested with MRI 1.8.6 and 1.8.7, REE 1.8.6, YARV 1.9.1, and JRuby 1.2.0


Please submit bug reports to

Further Reading



Sunspot is distributed under the MIT License, copyright © 2008-2009 Mat Brown