Put the following in your Gemfile:
gem 'bson_ext' gem 'mongo_mapper' gem 'sunspot_mongo'
rails g mongo_mapper:config rails g sunspot_rails:install rake sunspot:solr:start
gem 'bson_ext' gem 'mongoid' gem 'sunspot_mongo'
rails g mongoid:config rails g sunspot_rails:install rake sunspot:solr:start
Add the following to your model (assuming you have a string field named “content”):
include Sunspot::Mongo searchable do text :content end
Then search like usual:
search = Article.search do fulltext "something interesting" end search.results
Note: Mongoid adds Article.search, use Article.solr_search instead.
See the Sunspot documentation.
This gem has been tested against Ruby 1.9.2 and Rails 3.1, although it should work with older versions.