Acts As Indexed is a plugin which provides a pain-free way to add fulltext search to your Ruby on Rails app
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If you find this plugin useful, please consider a donation to show your support!

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This plugin allows boolean-queried fulltext search to be added to any Rails app with no dependencies and minimal setup.



Rails 2.x.x

./script/plugin install git://

Rails 3.x.x

rails plugin install git://

As a Gem

Despite this being slightly against the the original ethos of the project, acts_as_indexed is now available as a Gem as several people have requested it.

gem install acts_as_indexed

Make sure to specify the Gem in your environment.rb file (Rails 2.x.x), or the Gemfile (Rails 3.x.x).

No Git?

If you don't have git installed, you can download the plugin from the GitHub page ( and unpack it into the vendor/plugins directory of your rails app.



Add acts_as_indexed to the top of any models you want to index, along with a list of the fields you wish to be indexed.

class Post < ActiveRecord::Base
  acts_as_indexed :fields => [:title, :body]


The fields are not limited to model fields, but can be any instance method of the current model.

class User < ActiveRecord::Base
  acts_as_indexed :fields => [:address, :fullname]

  def fullname
    self.firstname + ' ' + self.lastname


Any of the configuration options in the Further Configuration section can be added as to the acts_as_indexed method call. These will override any defaults or global configuration.

You can specify proc that needs to evaluate to true before the item gets indexed. This is useful if you only want items with a certain state to be included. The Proc is passed the current object's instance so you are able to test against that.

For example, if you have a visible column that is false if the post is hidden, or true if it is visible, you can filter the index by doing:

class Post < ActiveRecord::Base
  acts_as_indexed :fields => [:title, :body], :if => { |post| post.visible? }


To search, call the with_query named scope on your model, passing a query as an argument.

# Returns array of Post objects.
my_search_results = Post.with_query('my search query')

# Chain it with any number of ActiveRecord methods and named_scopes.
my_search_results = Post.public.with_query('my search query').find(:all, :limit => 10) # return the first 10 matches which are public.

Query Options

The following query operators are supported:

  • AND

    This is the default option. 'cat dog' will find records matching 'cat' AND 'dog'.

  • NOT

    'cat -dog' will find records matching 'cat' AND NOT 'dog'


    'cat +me' will find records matching 'cat' and 'me', even if 'me' is smaller than the min_word_size

  • “”

    Quoted terms are matched as phrases. '“cat dog”' will find records matching the whole phrase. Quoted terms can be preceded by the NOT operator; 'cat -“big dog”' etc. Quoted terms can include words shorter than the min_word_size.

  • ^

    Terms that begin with ^ will match records that contain a word starting with the term. '^cat' will find matches containing 'cat', 'catapult', 'caterpillar' etc.

  • ^“”

    A quoted term that begins with ^ matches any phrase that begin with this phrase. '^“cat d”' will find records matching the whole phrases “cat dog” and “cat dinner”. This type of search is useful for autocomplete inputs.

    • A wildcard that matches zero to many characters. For instance '^pla*trub*rail' will match 'planetrubyonrails' and 'com*mun'ty will match 'community'.


Since with_query is a named scope, WillPaginate can be used in the normal fashion.

@images = Image.with_query('girl').paginate(:page => 1, :per_page => 5)

Further Configuration

A config block can be provided in your environment files or initializers. Example showing defaults:

ActsAsIndexed.configure do |config|
  config.index_file = [Rails.root.to_s,'index'] 
  config.index_file_depth = 3
  config.min_word_size = 3

A full rundown of the available configuration options can be found in lib/acts_as_indexed/configuration.rb

Heroku Support

Acts As Indexed now supports Heroku out-of-the-box. When a non-writeable root directory is detected, the index will be created in the tmp directory.

RDoc Documentation

To generate the RDoc documentation, run the rake rdoc task in the acts_as_indexed plugin folder. Then point your web browser at vendor/plugins/acts_as_indexed/rdoc/index.html.

Alternatively, you can view the rdoc documentation online.

Problems, Comments, Suggestions?

All of the above are most welcome.


Douglas F Shearer -

Future Releases

Future releases will be looking to add the following features:

  • Optional html scrubbing during indexing.

  • Ranking affected by field weightings.

  • Support for DataMapper, Sequel and the various MongoDB ORMs.

  • UTF-8 support. See the current solution in the following Gist: